Assignment 5

Modern Special Motor Designs

Introduction

Special motor designs are built for specific purposes. From the way they are designed to their characteristics show how this motors are used. Before designing a specialized motor, one should ask himself a few questions; what is the purpose of the motor? How much am I willing to spend on this motor? What characteristics am I looking to achieve from this motor. And finally what is the efficiency of this motor.

Some of these special motors include;

Conventional brushless motors; come in a variety of configurations. The most widely used look much like brush-type motors. But brushless motors have a wound stator that surrounds a permanent-magnet rotor, an inverse arrangement from that for brush motors. And stator windings are commutated electronically rather than through a conventional commutator and brushes.

Brushless motors generally contain a three-phase winding, although some operate four phase. Brushless motors powering small fans and other constant-speed equipment are often two phase.

Power for brushless motors generally is a trapezoidal ac wave form, but some of the motors operate with sine waves. Trapezoidal-powered motors develop about 10% more torque than those on sine-wave power. Sinusoidal-powered motors, however, exhibit less torque ripple and operate smoother at low speed. Thus, sinusoidal-powered motors are often used for machining, grinding, coating, and other operations calling for fine surface finishes.

Because they have no commutator, brushless motors are more efficient, need less maintenance, and can operate at higher speeds than conventional dc motors. High efficiency and small size are especially important for military, aircraft, and automotive applications, and for portable instruments and communications equipment.

The cost of both brush-type and brushless motors likely will rise because of increasing costs for iron, steel, copper, aluminum, and magnets. The increases will be partly offset by use of neodymium-iron-boron magnets. The magnets are often more powerful than samarium-cobalt magnets and promise to be much less expensive.

Amplifiers for brushless motors are more complex than brush types and generally call for two additional solid-state power switches. These switches account for most of the cost differential between the two types. But switch cost continues to drop, in part because of increased use of MOSFET and insulated-gate type switches. Costs also are dropping for ICs used in commutation, feedback interpretation, and PWM circuits. The lower costs reduce but do not eliminate the price differential between amplifiers for the two types of systems.

Linear DC Motors

A linear dc motor, like a rotating dc motor, generates mechanical force by the interaction of current in conductors and magnetic flux provided by permanent rare-earth magnets. It is constructed of a stator assembly and a slider. The stator assembly serves as the body and contains a laminated steel structure with conductors wound in transverse slots. The slider contains one or more sets of magnets, commutation components, a bearing surface, and its body completes the magnetic flux path between the magnets.

The brush-type slider carriers two sets of brushes. One set picks up the power from a pair of copper rails, and the second set transfers power into the conductors located under the slider through commutator segments. Two of three phases are energized at any one time.

The brushless slider contains an additional set of magnets which activate Hall-effect sensors and solid-state switches to commutate the motor windings. A dc linear motor positioning system is extremely stiff, fast, and efficient. It is capable of precision accuracy to 0.1 micron and does not deteriorate with wear. It can drive loads directly, obviating the need for gears and lead screws. Its typical range of thrust and travel is 2.5 to 2,500 lb and a few inches to about 4 ft.

Coreless DC Motors

The development of moving-coil or coreless motors dates back to the middle 1930s. But it wasn't until the early 1960s that they were produced economically enough to gain wide acceptance.

Major advantages of coreless motors include very low inertia, low mechanical time constant, and high efficiency. Because the core is ironless, its low mass allows more rapid acceleration and deceleration than any other class of dc motor.

Other benefits gained by eliminating the iron core include the absence of magnetic fields acting on the laminations. This interaction in conventional motors appears as torque ripple or cogging plus a resisting torque that decreases motor efficiency. The absence of iron eliminates cogging and the coreless motor operates smoothly, even at low speeds.

Elimination of the iron core dramatically diminishes rotor inductance and resultant arcing. Commutator arcing in conventional motors is caused primarily by the release of stored energy in the armature inductance upon commutation. Excessive arcing produces electrical noise and reduces the life of brushes.

Coreless motors are classified by rotor shapes as cylindrical or disc. Cylindrical rotors are further divided into those containing inside fields or outside fields. The disc types have pancake, printed, or three-coil rotors.

The cylindrical outside-field motor has the smallest mechanical time constant. The stator is a cylindrical permanent magnet surrounded by a mild steel housing. The rotor is a hollow cylindrical coil wound of copper wire and located in the center of the stator. A mechanical time constant of 1 msec is not unusual for this type of motor.

Rotors are typically wound in a skewed or honeycomb pattern (also known as Faulhaber winding) to ensure that all of the core helps produce torque and smooth operation. The flux lines extend radially outward from the permanent-magnet stator through the air gap. The soft iron housing is the flux return path which allows the air gap to be extremely small, producing a high flux density.

The cylindrical inside-field motor is a similar design, but the permanent-magnet stator is located inside the hollow rotor. The motor also features a low moment of inertia, but the mechanical time constant is typically higher than the outside-field motor because of smaller stator magnets.

Coreless motor commutator and brushes are typically small, primarily because they are made of precious metals -- gold, silver, platinum, or palladium. In addition, a smaller commutator has lower peripheral speed, less wear, and accounts for a smaller motor.

Outside-field motors are usually selected for high acceleration. Because of this, the rotor coils must handle a large load torque and dissipate high heat produced by peak currents. To handle the torque, manufacturers strengthen the rotor with glass epoxy. Since the rotor does not have an iron core to act as a heat sink, the housing has ports for forced air cooling.

Recent advances in coreless motor design include the replacement of AlNiCo with samarium-cobalt stator magnets. Also, the mechanical time constant is reduced by as much as two times with aluminum rotor wire instead of copper.

Typical accelerations for these improved motors are 150,000 rad/sec², but rates up to 1 million rad/sec² are possible. This greatly exceeds the 30,000 to 50,000 rad/sec² rates available with iron-core rotor servomotors.

Limited-angle torque motors

A special type of brushless motor is called a limited-angle torque (LAT). LATs are constrained to produce torque through a rotation angle of less than 180°. But they are widely used to operate servovalves, direct laser mirrors, position missile-guidance radar antennas, open shutters for heat-seeking sensors, and power other systems that rotate through small angles.

The rotor in a limited-angle torque carries field magnets, and the stator supports armature windings (similar to the construction of conventional brushless motors). LATs, however, are wound single phase, unlike conventional brushless types, which are typically wound for two or three-phase operation. Single-phase construction eliminates the need for commutation circuitry.

Conventional brushless motors can also be used for limited-angle service. But when conventional three-phase brushless motors are used as LATs, only two of the three leads are used.

Armature windings in some limited-angle torques are embedded in slots around the inside periphery of a laminated stator, a construction similar to that used with conventional brushless motors. In another design, the armature is toroidally wound on a spotless stator. Here, some stators are laminated and others are solid.

Slot-wound LATs exhibit higher motor constant K_m than corresponding toroidally wound types. The primary reason is that a larger number of conductors can be exposed to the magnetic field.

In slot-wound LATs, heat is more easily conducted from the armature core to the outer housing than in toroidal versions, which can rely only on the mounting tabs for heat conduction. Thus, slot-wound types generally can carry heavier loads than corresponding toroidally wound motors. Slot-wound LATs, however, exhibit more torque ripple (cogging) and generate greater friction and hysteresis losses.

Cogging is essentially zero in toroidally wound LATs, a result of non varying reluctance path and relatively large air gap. Toroidally wound armatures, moreover, are typically molded onto the stator, which protects the windings from damage and holds them in place.

Uniform reluctance paths also make toroidally wound LATs suitable for use as limited-angle tachometers. Here, the motors are often used in pairs, one as a torque and the second as a tachometer. The tachometer provides a reference speed signal for the motor-control circuit.

LATs produce torque through a rotation angle determined by the number of motor poles. Current of one polarity produces clockwise torque, and vice versa.

Manufacturers generally provide a theoretical torque versus shaft-position curve. Typically, the characteristic curve for LATs is represented by the positive lobe of a cosine function; that is, T = T_pcos(θN/2), where θ = angle of rotation and N = number of poles. The general torque characteristic for toroidally wound motors can be represented by a similar curve, but it may also have a flat portion.

The above equation approximates torque values only for the roll-off portions of the curves. Also, the actual torque-position characteristics may vary somewhat from that shown in the curves. In particular, the curves do not reflect the effects of armature reaction, which depends on both armature current level and field magnet.

In any case, the rotational range of a LAT is generally specified in terms of a so-called excursion angle. This angle represents the difference between the rotor position that produces maximum torque and the zero-torque point on the characteristic curve.

Limited-angle torques are generally specified with a set of factors similar to those used for conventional brushless motors. Motor performance is determined with an identical set of equations.

Limited-angle torques is currently available in ratings from 2.8 to 1,000 oz-in. The 2.8 oz-in. LAT, a two-pole motor, has a 90° excursion angle. Its stator is 0.7 in. in diameter, weighs 1.7 oz, and is rated for 80 W peaks. The 1,000 oz-in. LAT, a 10-pole motor, has an 18° excursion angle. Its stator is 1.64 in. in diameter, weighs 45 oz, and is rated for 437 W peaks.

LATs that have much lower and higher torque ratings are feasible. In addition, excursion angles smaller than 18° are possible, while the maximum possible excursion is 180°.

Limited-angle torqueses generally are controlled through single-phase servo amplifiers. Single-phase PWM amplifiers are widely used for the application, but LATs rated up to a few hundred watts are more often powered by linear amplifiers.

Thermal limitations restrict linear to these low power levels. But in this range, linear amplifiers generally are simpler and less costly than PWM types

Reference

• http://www.electricmotors.machinedesign.com/BDEList.aspx

• http://www.faulhaber-group.com/n378492/n.html

• http://www.faulhaber-group.com/n378421/n.html

Assignment 4

Generator Designs and Application

Definition

An electrical Generator is a machine which converts mechanical energy into electrical energy.

Principle:

It is based on the principle of production of dynamically induced e.m.f (Electromotive Force). Whenever a conductor cuts magnetic flux, dynamically induced e.m.f. is produced in it according to Faraday's Laws of Electromagnetic Induction. This e.m.f. causes a current to flow if the conductor circuit is closed.

Hence, the basic essential parts of an electric generator are:

· A magnetic field

· A conductor or conductors which move as to cut the flux.

The Dynamo was the first electrical generator capable of delivering power for industry. The dynamo uses electromagnetic principles to convert mechanical rotation into a pulsing direct electric current through the use of a commutator.

Through a series of accidental discoveries, the dynamo became the source of many later inventions, including the DC electric motor, the AC alternator, the AC synchronous motor, and the rotary converter.

A dynamo machine consists of a stationary structure, which provides a constant magnetic field, and a set of rotating windings which turn within that field. On small machines the constant magnetic field may be provided by one or more permanent magnets; larger machines have the constant magnetic field provided by one or more electromagnets, which are usually called field coils.

blelow is a typical portable generator;

The two main parts of a generator or motor can be described in either mechanical or electrical terms:

Mechanical:

· Rotor: The rotating part of an alternator, generator, dynamo or motor.

· Stator: The stationary part of an alternator, generator, dynamo or motor.

Electrical:

· Armature:

The power-producing component of an alternator, generator, dynamo or motor. In a generator, alternator, or dynamo the armature windings generate the electrical current. The armature can be on either the rotor or the stator.

· Field:

The magnetic field component of an alternator, generator, dynamo or motor. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator. (For a more technical discussion, refer to the Field coil article.)

Since power transferred into the field circuit is much less than in the armature circuit, AC generators nearly always have the field winding on the rotor and the stator as the armature winding. Only a small amount of field current must be transferred to the moving rotor, using slip rings. Direct current machines necessarily have the commutator on the rotating shaft, so the armature windin

Below is a simple illustration of the generator

conclusion

The generator is one of the most important electrical invention because it produces electricity. Generators over the years has found its way into our day today life; from the main generating stations to the back up generators at home.Generators have also changed in terms of size and form. now days you can get a generator that is convinient for your needs.

Assignment 3

THREE-PHASE AC MOTORS

Introduction

Industry uses, in addition to single-phase AC, a power source called polyphase AC (“poly” meaning “many”).The most common form of polyphase AC is three-phase. Three-phase AC consists of three alternating currents of equal frequency and amplitude, but differing in phase from each other by one-third of a period.

The biggest advantage in using three-phase power is in the machines it supplies. Three-phase motors are much simpler in construction than other types and, hence, require less maintenance. A more powerful machine can be built into a smaller frame and it will operate at a higher efficiency. All AC motors then can be classified into single-phase and polyphase motors. Because polyphase motors are the most commonly used in industrial applications. Polyphase motors make up the largest single type in use today and usually are the first to be considered for the average industrial application. There are several types of polyphase motors. The most common type of motor in this group is the squirrel-cage polyphase induction motor so called because the rotor is constructed like a squirrel-cage

CONSTRUCTION AND OPERATION
The next figure shows a cutaway view of a three-phase induction motor. There is very little difference between the AC motor and the AC generator. The rotor is supported by bearings at each end. The stator is freed in position to the inside of the motor frame. The frame encloses all the components of the motor.




REVOLVING FIELD OPERATION

The rotating field is set up by out-of-phase currents in the stator windings. The figure below shows the manner in which a rotating field is produced by stationary coils or windings when they are supplied by a three-phase current source. For the purpose of explanation, rotation of the field is developed in the figure by "stopping" it at six selected positions, or instants. These instants are marked off at 60-degree intervals on the sine waves representing currents in the three phases A, B, and C.





At instant 1, the current in phase B is maximum positive. (Assume plus 10 amperes in this example.) Current is considered to be positive when it is flowing out from a motor terminal. At the same time (instant 1), current flows into A and C terminals at half value (minus 5 amperes each in this case). These currents combine at the neutral (common connection) to supply plus 10 amperes out through the B phase.

The resulting field at instant 1 is established downward and to the right as shown by the arrow NS. The major part of this field is produced by the B phase (full strength at this time) and is aided by the adjacent phases A and C (half strength). The weaker parts of the field are indicated by the letters n ands. The field is a two-pole field extending across the space that would normally contain the rotor.
At instant 2, the current in phase B is reduced to half value (plus 5 amperes in this example). The current in phase C has reversed its flow from minus 5 amperes to plus 5 amperes, and the current in phase A has increased from minus 5 amperes to minus 10 amperes.
The resulting field at instant 2 is now established upward and to the right as shown by the arrow NS. The major part of the field is produced by phase A (full strength) and the weaker parts by phases B and C (half strength).
At instant 3, the current in phase C is plus 10 amperes, and the field extends vertically upward. At instant 4 the current in phase B becomes minus 10 amperes, and the field extends upward and to the left. At instant 5, the current in phase A becomes plus 10 amperes, and the field extends downward and to the left. At instant 6, the current in phase C is minus 10 amperes, and the field extends vertically downward. In instant 7 (not shown), the current corresponds to instant 1 when the field again extends downward and to the right.
Thus, a full rotation of the two-pole field has been done through one full cycle of 360 electrical degrees of the three-phase currents flowing through the stator windings.

SYNCHRONOUS SPEED
The number of poles in the motor will determine how many times the magnetic field in the stator revolves for any given generated frequency. The term "pole" should bring to mind the terms used in Chapter 2 on magnetism. The following definition of a motor pole gives it a practical application value: A motor pole is the completed circuit of a motor stator winding that, when energized by a current, will produce a magnetic field concentration, or polarity.

The speed of the revolving stator field is called synchronous speed. The synchronous speed depends on two factors:

• - The number of poles.

• - The frequency of the power source.

The synchronous speed, in turn, determines the speed of the motor rotor. Just as with the generator prime mover speed, the generated frequency and rotor speed are directly related. The number of poles in the motor determines how fast the revolving field will move around the inside periphery of the motor housing at a given frequency. The more poles a motor has, the longer it takes to energize all the sets of poles and the slower the motor field will revolve at 60 hertz.

Reference

• http://www.oddparts.com/acsi/motortut.htm

• http://www.pacontrol.com/3phasemotors1.html

• http://www.lincolnmotors.com/pdf/d-funds.pdf

Assignment 2

AC MOTOR DESIGNS AND USES

Introduction

Motors are electromagnetic devices that are used to convert electrical energy into mechanical work. There are three classes of AC motors

1. synchronous motors,

2. induction motors

3. Series wound motors.

The most common motor classes are synchronous and induction motors.

NEMA MG 1-2003 has the following definitions:

An induction machine is an asynchronous machine that has a magnetic circuit interlinked with two electric circuits, or sets of circuits, rotating with respect to each other. Power is transferred from one circuit to another by electromagnetic induction.

A synchronous machine is an alternating-current machine in which the average speed of normal operation is exactly proportional to the frequency of the system to which it is connected

A common differentiator is the phase of the motor. Single-phase motors use a single discrete waveform while two and three phase motors use two and three discrete polyphase waveforms that are spaced 180 and 120 degrees apart.

• Single-phase AC induction motors: In this type of motor, only one discrete waveform is used. It has a rotating magnetic field to create the starting torque. These are used in devices like fans, washing machines, clothes dryer and other small household appliances. Important types are shaded pole motors and split phase induction motors.
• Three-phase AC induction motors: These are used in high power applications. The phase difference between the three discrete waveforms of the input polyphase creates a rotating magnetic field. They are the workhorses of the industry and are used in heavy-duty electrical networks, locomotives and other applications. Using the principles of electromagnetic induction, current is induced in the conductors of the rotor by a rotating magnetic field. This creates a counterbalance field that makes the rotor turn in the direction of the magnetic field. The rotor rotates at a slower rate than the magnetic field. These motors will work even if one phase is disconnected.
• Single-phase AC synchronous motors: These motors rotate in a synchronous manner with the main current frequency. They have magnetized rotors and do not need an induced current. This prevents backward slippage against the main frequency which makes them very accurate. They are used in audio turntables, mechanical clocks, tape drives, telescope drive systems, strip chart recorders and other applications.
• Three-phase AC synchronous motors: These motors provide high and accurate performance and are used in traction motor applications and in TGV locomotives. Connections to the rotor coils are given on slip rings and a separate field current is given. This produces a continuous magnetic field that causes the rotor to rotate synchronously with the rotating magnetic field. These motors can also be used as alternators. To reduce starting problems, the motors are driven by transistorized variable frequency drives or with squirrel cage winding with a common rotor.
• Stepper motors: The design is similar to three-phase AC synchronous motors and is a hybrid of a DC motor with solenoid. They have an internal rotor with permanent magnets that is controlled by external magnets which are operated electronically. The motor does not rotate continuously but steps from one position to another when the windings are activated and deactivated in a sequence. This allows them to turn forwards or backwards. They are used in sophisticated positioning drives and in servo controlled systems.

Conclusion

As seen above the motors design depends upon the function in with the machine is intended to be used for. This therefore makes the functions of machines dependant on the nature of the work the machine is going to be doing.

Reference

• http://209.85.165.104/search?q=cache:cqp_9eLb3VwJ:www.pdhengineer.com/Course%2520Files/Completed%2520Course%2520PDF%2520Files/Electrical/Induction%2520and%2520Synchronous%2520Motor%2520Fundamentals.pdf+&hl=en&ct=clnk&cd=7&gl=uk
• http://www.zycon.com/Design-Info/Electric-Motors/Electric-Motors.asp

DC Machine and its applications

DC Machines and its application

Introdution

An electric motor uses electrical energy to produce mechanical energy. The reverse process that of using mechanical energy to produce electrical energy is accomplished by a generator or dynamo. Traction motors used on locomotives often perform both tasks if the locomotive is equipped with dynamic brakes. Electric motors are found in household appliances such as fans, refrigerators, washing machines, pool pumps, floor vacuums, and fan-forced ovens.
Industrial applications use dc motors because the speed-torque relationship can be varied to almost any useful form for both dc motor and regeneration applications in either direction of rotation. Continuous operation of dc motors is commonly available over a speed range of 8:1. Infinite range (smooth control down to zero speed) for short durations or reduced load is also common.

DC Motor types
Wound-field dc motors are usually classified by;
1. shunt-wound,
2. series-wound,
3. Compound-wound.
In addition to these, permanent-magnet and brushless dc motors are also available, normally as fractional-horsepower dc motors. Dc motors may be further classified for intermittent or continuous duty. Continuous-duty dc motors can run without an off period.
DC Motors - Speed control
There are two ways to adjust the speed of a wound-field dc motor. Combinations of the two are sometimes used to adjust the speed of a dc motor.
DC Motor - Shunt-field control
Reel drives require this kind of control. The dc motor's material is wound on a reel at constant linear speed and constant strip tension, regardless of diameter.
Control is obtained by weakening the shunt-field current of the dc motor to increase speed and to reduce output torque for a given armature current. Since the rating of a dc motor is determined by heating, the maximum permissible armature current is approximately constant over the speed range. This means that at rated current, the dc motor's output torque varies inversely with speed, and the dc motor has constant-horsepower capability over its speed range.
Dc motors offer a solution, which is good for only obtaining speeds greater than the base speed. A momentary speed reduction below the dc motor's base speed can be obtained by overexciting the field, but prolonged over excitation overheats the dc motor. Also, magnetic saturation in the dc motor permits only a small reduction in speed for a substantial increase in field voltage.
Dc motors have a maximum standard speed range by field control is 3:1, and this occurs only at low base speeds. Special dc motors have greater speed ranges, but if the dc motor's speed range is much greater than 3:1, some other control method is used for at least part of the range.
Armature-voltage DC Motor Control:
In this method, shunt-field current is maintained constant from a separate source while the voltage applied to the armature is varied. Dc motors feature a speed, which is proportional to the counter emf. This is equal to the applied voltage minus the armature circuit IR drop. At rated current, the torque remains constant regardless of the dc motor speed (since the magnetic flux is constant) and, therefore, the dc motor has constant torque capability over its speed range. Horsepower varies directly with speed. Actually, as the speed of a self-ventilated motor is lowered, it loses ventilation and cannot be loaded with quite as much armature current without exceeding the rated temperature rise.
DC Motors - Selection:
Choosing a dc motor and associated equipment for a given application requires consideration of several factors.
DC Motors - Speed range
If field control is to be used, and a large speed range is required, the base speed must be proportionately lower and the motor size must be larger. If speed range is much over 3:1, armature voltage control should be considered for at least part of the range. Very wide dynamic speed range can be obtained with armature voltage control. However, below about 60% of base speed, the motor should be derated or used for only short periods.
DC Motors - Speed variation with torque:
Applications requiring constant speed at all torque demands should use a shunt-wound dc motor. If speed change with load must be minimized, a dc motor regulator, such as one employing feedback from a tachometer, must be used.
When the dc motor speed must decrease as the load increases, compound or series-wound dc motors may be used. Or, a dc motor power supply with a drooping volt-ampere curve could be used with a shunt-wound dc motor.
DC Motors – Reversing
This operation affects power supply and control, and may affect the dc motor's brush adjustment, if the dc motor cannot be stopped for switching before reverse operation. In this case, compound and stabilizing dc motor windings should not be used, and a suitable armature-voltage control system should supply power to the dc motor.
DC Motors - Duty cycle:
Direct current motors are seldom used on drives that run continuously at one speed and load. Motor size needed may be determined by either the peak torque requirement or heating.
DC Motors - Peak torque:
The peak torque that a dc motor delivers is limited by that load at which damaging commutation begins. Dc motor brush and commutator damage depends on sparking severity and duration. Therefore, the dc motor's peak torque depends on the duration and frequency of occurrence of the overload. Dc motor peak torque is often limited by the maximum current that the power supply can deliver.
Dc motors can commutate greater loads at low speed without damage. NEMA standards specify that machines powered by dc motors must deliver at least 150% rated current for 1 min at any speed within rated range, but most dc motors do much better.
DC Motors - Heating:
Dc motor temperature is a function of ventilation and electrical/mechanical losses in the machine. Some dc motors feature losses, such as core, shunt-field, and brush-friction losses, which are independent of load, but vary with speed and excitation.
The best method to predict a given dc motor's operating temperature is to use thermal capability curves available from the dc motor manufacturer. If curves are not available, dc motor temperature can be estimated by the power-loss method. This method requires a total losses versus load curve or an efficiency curve.
For each portion of the duty cycle, power loss is obtained and multiplied by the duration of that portion of the cycle. The summation of these products divided by the total cycle time gives the dc motor's average power loss. The ratio of this value to the power loss at the motor rating is multiplied by the dc motor's rated temperature rise to give the approximate temperature rise of the dc motor when operated on that duty cycle
Others type
Coreless DC Motor
The Faulhaber 0615 6-mm-diameter coreless dc motor is available with a matching diameter planetary gearhead.
Designed with a high-energy rare-earth magnet and Faulhaber skew winding, it is available in 1.5, 3, and 4-V versions. The motor has a no-load speed of 19,000 rpm and is capable of 0.11-mNm continuous and peak torque at stall of 0.24 mNm. The motor's output power is 0.12 W and its standard-operating-temperature range is 30 to 85°C.
The matching 06/1 planetary gearhead is an all-steel design available in ratios from 4:1 to 4,096:1. The gearhead is rated at 25-mNm continuous and 35-mNm peak. Standard-operating temperature range is 30 to 100°C. A radial shaft load of up to 5 N is possible with the ballbearing version, Model 06/1K.
Reference:
1. http://www.electricmotors.machinedesign.com/BDEList.aspx
2. http://www.faulhaber-group.com/n378492/n.html
3. http://www.faulhaber-group.com/n378421/n.html