Todays deals on Synchronous Motor?

NEW Siemens 1FT6086-1AH71-1AG1 Synchronous Servo Motor +optical Encoder 1FT6 $1,799.00

GE CR192 Synchronous Motor Control w/ Microprocessor Starting/Protection NEW $1,125.00

FADAL PARTS 8LSN54.E3030D000-0 SYNCHRONOUS MOTOR ***NIB*** $949.00

NEW Siemens 1FK7 SYNCHRONOUS SERVOMOTOR CONVEYOR MOTOR 1FK7043-7AK71-1TA0-Z $799.00

FADAL PARTS 8LSN54.E3030D000-0 SYNCHRONOUS MOTOR ***NNB*** $789.00

NEW Siemens 1FK7042-5AF71-1GG3 Synchronous Motor $800.00

AC TO DC CONVERTOR/ INDUCTION SYNCHRONOUS GENERATORS $800.00

Basler Electric Synchronous Motor Pullout Relay PRP320 $799.00

REXROTH Synchronous Servo Motor MSK060C-0600-NN-S1-UPO-NNNN NEW $750.00

REXROTH Synchronous Servo Motor MSK040C-0600-NN-S1-UGO-NNNN NEW $750.00

NEW SUPERIOR ELECTRIC SLO-SYN SS150B AC SYNCHRONOUS STEPPING MOTOR 120V 72RPM $599.00

SUPERIOR ELECTRIC SS451-1034 SYNCHRONOUS MOTOR *NEW NO BOX* $500.00

SUPERIOR ELECTRIC SS241CT SYNCHRONOUS MOTOR 1PH 120VAC 0.4A 60HZ 72RPM NEW!!! $389.99

SUPERIOR ELECTRIC SS400B SLO-SYN SYNCHRONOUS/STEPPING MOTOR $399.99

SUPERIOR ELECTRIC, AC SYNCHRONOUS MOTOR, SS241TG12 $380.00

Slo-Syn Synchronous Motor SS241CT SS240 1-Phase 120VAC 0.4 Amps 72 rpm 60Hz New $374.95

NEW SANYO DENKI 103M89332-2540 SYNCHRONOUS MOTOR STANDARD TYPE 240VAC 50/60HZ $329.99

Slo-Syn Superior Synchronous Motor SS241TG9 _ SS241TG 9 $330.00

New Superior SLO-SYN Synchronous Motor SS241-1004 120 V $299.00

Nomad synchronous motor with transformer vintage $260.00

SLO-SYN SYNCHRONOUS MOTOR SS451LG5 *NICE* $250.00

TOSHIBA/HOUSTON 3 PHASE SYNCHRONOUS ELECTRIC MOTOR,4POLE,1500/1800 RPM $199.99

CORONA 3 PHASE SYNCHRONOUS ELECTRIC MOTOR-RPM-1500/1800 $199.99

Lot of 3 Superior Electric Synchronous Stepping Motors $220.00

NEW SANYO DENKI 103M89332-2540 STEPSYN SYNCHRONOUS MOTOR $209.99

Superior Electric Slo-Syn Synchronous/DC Stepping Motor #HS450 $199.00

WARNER ELECTRIC SYNCHRONOUS MOTOR SS50P1 *NICE* $200.00

SUPERIOR ELECTRIC SS91-2002E SYNCHRONOUS MOTOR *USED* $200.00

Hengstler GMBH M21 Encoder Motor Feedback System AC Synchronous & BLDC Motors $199.99

HURST 990182 SYNCHRONOUS INSTRUMENT MOTOR ***NIB*** $189.00

NEW SUPERIOR SS250B SLO-SYN SYNCHRONOUS ELECTRIC MOTOR 120Vac $189.99

SANYO DENKI 103M89332-2540 STEPSYN SYNCHRONOUS MOTOR $172.99

Danaher Slo-Syn Synchronous DC Motor M112-FJ08 5.8V NR $178.49

SUPERIOR ELECTRIC SLO-SYN M092-FD-8009 SYNCHRONOUS/STEPPING MOTOR SPEC. BM101029 $175.95

Hengstler GMBH M21 Encoder Motor Feedback System AC Synchronous & BLDC Motors $169.99

HURST SYNCHRONOUS GEAR MOTOR 3402-008 90VDC DUAL SPEED $140.00

Superior Electric Stepper Motor M092-FC09E Synchronous 2.5 VDC 4.6 A (5609) $140.00

VINTAGE MOTOR BEAU HYSTERESIS SYNCHRONOUS 3 SPEED 04479 $148.50

Slo-Syn Synchronous/Stepping Motor M093-FF-402 $129.00

Supierior Electric Slo-Syn Stepper Motor AC Synchronous $125.00

NIB SUPERIOR SLO-SYN SYNCHRONOUS STEPPING MOTOR M091-FC09C3A $119.00

SUPERIOR ELECTRIC M061-DF-306 13.0V 1.3A 24 STEPS/REV SYNCHRONOUS STEPPING MOTOR $94.99

SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS STEPPING MOTOR, TYPE M112-FJ-327, 2.1V $125.00

SUPERIOR ELECTRIC M061-FD-311 SYNCHRONOUS STEPPING MOTOR NSN: 6105-00-173-2772 $125.00

# Slo-Syn SS222 Synchronous/Stepping Motor $124.99

SAIA Synchronous Rotational Motor UDR1 UDR1NB4D16CNUP $110.53

SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS STEPPING MOTOR $67.00

Superior Electric Slo-Syn M092-FD09 Synchronous/Stepping Motor Set of two(2) $100.00

3SK10GN-AUL / 3GN6KA ORIENTAL SYNCHRONOUS MOTOR W/HEAD $99.00

NEW Japan Servo Synchronous Motor USH8P1ON H MKII Serie $99.99

(4) Hurst 2602-012 Reversible Permanent Magnet AC Synchronous Motors $99.95

Tesla Coil Synchronous Rotary Spark Gap Motor & Mandrel $98.00

New Hurst Model KS Geared Reluctance Synchronous Motor 115V 60Hz $99.99

APPLIED MOTION SYNCHRONOUS STEPPING MOTOR 4034-331 $100.00

* SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS STEPPING MOTOR MO63-FD09 METAL SETUP $76.00

Superior Electric Slo-Syn Synchronous Stepping Motor BM131411 25 STEP (6526) $96.00

Slo-Syn Synchronous Motor Type SS25, 72rpm, 25 oz.-in. NEW w/instructions $99.99

Slo-Syn Synchronous Motor Type SS-50, 72rpm, 50 oz.-in. slightly used, in box $99.99

NEW SLO-SYN SYNCHRONOUS STEPPING MOTOR W/ 2 SHAFTS CNC $89.99

Hurst Model KS 2432-557 Motor Reluctance AC Synchronous Geared 115V Servo $89.99

BoDINE, 23X2FEHH, HY-Sync AC Synchronous / 5.1V, DC Stepping Motor $49.99

ORIENTAL SYNCHRONOUS MOTOR 5SK25GN-AUL WITH GEAR HEAD $100.00

SUPERIOR ELECTRIC KSL061T1Y SYNCHRONOUS MOTOR $89.99

Berger Lahr Reversible Synchronous Motor RSM768/4 B SK NIB $99.99

Slo syn synchronous/stepping motors mo63 fs 402 b $89.00

Superior Electric Synchronous Stepping Motor SS221LG3 Step Stepper Slo-Syn $95.00

24VAC 5 Watt 1 RPM Synchronous Motor FREE SHIPPING $93.00

SAIA UDR1UJ1B10CNNA SYNCHRONOUS ROTATIONAL MOTOR $92.95

¤ CUTLER HAMMER SYNCHRONOUS MOTOR DRIVEN RESET TIMER BUL. 10336H W/ ENCLOSURE ¤ $79.99

Hurst PC-DA SYNCHRONOUS MOTOR 115VOLTS 60HZ 4RPM 5WATTS $89.99

SUPERIOR ELECTRIC M091-FD06U SYNCHRONOUS MOTOR ***XLNT*** $79.00

BODINE ELECTRIC HY-SYNC AC SYNCHRONOUS MOTOR 23X1BEHY $79.99

Vintage Bendix Aviation Marine Selsyn Motor Type XV Transformer AC Synchronous $75.00

Vintage Ford Instruments ICT Control Transformer Synchronous Sel-Syn Motor $75.00

Vintage Bendix Aviation Selsyn Synchronous Motor Mk 8 Model 4A Type 1F $75.00

SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS/STEPPING MOTOR M061-LE-501, STEPS 200 $85.00

Bodine AC Synchronous/DC Stepping Motor 23T2BEHD-D3 $75.00

SET OF 4 NEW SUPERIOR ELEC. SLO-SYN SYNCHRONOUS/STEPPING MOTORS – CLOSEOUT ! ! $39.99

RELIANCE 322432721 B13 SYNCHRONOUS MOTOR ***NIB*** $69.00

Synchronous Motor Type A-1 1R.P.M 100V 50Hz 4W $54.00

BRUSHLESS SYNCHRONOUS MOTOR FIELD FAILURE APPLICATION $50.00

SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS/STEPPING MOTOR M092-FD-302 $69.99

Teletype Synchronous Motor 3600 rpm with relay & base for Tesla Coil Rotary Gap $65.00

Superior Elect SLO-SYN Synchronous / Stepping Motor M062-FC03C3A, M062-FC-412C3A $65.00

Teletype Synchronous Motor 3600 rpm NOS with relay for Tesla Coil Rotary Gap $64.00

SLO-SYN SYNCHRONOUS STEPPING MOTOR-M093-FF-206K , NEW! $60.00

Superior Electric SLO-SYN SS150B Synchronous Stepping Motor, 120V, 72 RPM, *NEW* $74.50

SLO-SYN SS400 SYNCHRONOUS STEPPING STEPPER MOTOR 30V DC $59.95

(3) Hurst 2602-013 Reversible Permanent Magnet AC Synchronous Motors $59.95

SLO-SYN X-1500 72 rpm 120 V Explosion Proof Electric SYNCHRONOUS Stepping Motor $59.99

SUPERIOR ELECTRIC SLO-SYN SYNCHRONOUS/STEPPING MOTOR $60.00

HPLC INJECTOR SAMPLER SLO-SYN SYNCHRONOUS STEP MOTOR $59.99

ELINCO Synchronous Motor Type WSS20A-60H $69.00

Applied Motion Synchronous Stepping Motor 5023-442 $67.50

NEW! OMRON SYNCHRONOUS MOTOR TIMER STP-MND-AH-UA $59.95

TWO CLIFTON PRECISION SYNCHRONOUS / STEPPER MOTORS W/OPTICAL ENCODER $54.99

New Saia-Burgess Rotational UDS1 Synchronous Motor Part# UDS1NB4A15ENNN 24V 50Hz $65.00

SUPERIOR ELECTRIC SLO-SYN M091-FD03 SYNCHRONOUS/STEPPING MOTOR, NEW $65.00

HURST 2602-006 SYNCHRONOUS MOTOR 115VAC 60HZ 7W $65.00

SUPERIOR ELECTRIC SYNCHRONOUS STEPPING MOTOR M061-FD08 $49.95

Synchronous Motor Questions

Understanding Modern Electrical Motors

Understanding Modern Electrical Motors

Modern electrical motors are available in many different forms, such as single phase motors, three phase motors, brake motors, synchronous motors, asynchronous motors, special customised motors, two speed motors, three speed motors, and so on, all with their own performance and characteristics.

For each type of motor there are many different mounting arrangements, for example foot mounting, flange mounting or combined foot and flange mounting. The cooling method can also differ very much, from the simplest motor with free self-circulation of air to a more complex motor with totally enclosed air-water cooling with an interchangeable cassette type of cooler.

To ensure a long lifetime for the motor it is important to keep it with the correct degree of protection when under heavy-duty conditions in a servere environment. The two letters IP (International Protection) state the degree of protection followed by two digits, the first of which indicates the degree of protection against contact and penetration of solid objects, whereas the second states the motor’s degree of protection against water.

The end of the motor is defined in the IEC-standard as follows:

• The D-end is normally the drive end of the motor.
• The N-end is normally the non-drive end of the motor.

Squirrel Cage Motors

In this book the focus has been placed on the squirrel cage motor, the most common type of motor on the market. It is relatively cheap and the maintenance cost is normally low. There are many different manufacturers represented on the market, selling at various prices. Not all motors have the same performance and quality as for example motors from ABB. High efficiency enables significant savings in energy costs during the motor’s normal endurance. The low level of noise is something else that is of interest today, as is the ability to withstand severe environments.

There are also other parameters that differ. The design of the rotor affects the starting current and torque and the variation can be really large between different manufacturers for the same power rating. When using a Softstarter it is good if the motor has a high starting torque at Direct-on-line (D.O.L) start. When these motors are used together with a softstarter it is possible to reduce the starting current further when compared to motors with low starting torque. The number of poles also affects the technical data. A motor with two poles often has a lower starting torque than motors with four or more poles.

Voltage

Three-phase single speed motors can normally be connected for two different voltage levels. The three stator windings are connected in star (Y) or delta (D).

The windings can also be connected in series or parallel, Y or YY for instance. If the rating plate on a squirrel cage motor indicates voltages for both the star and delta connection, it is possible to use the motor for both 230 V, and 400 V as an example.

The winding is delta connected at 230 V and if the main voltage is 400 V, the Y-connection is used.

When changing the main voltage it is important to remember that for the same power rating the rated motor current will change depending on the voltage level.

The method for connecting the motor to the terminal blocks for star or delta connection is shown in the picture below.

Power Factor

A motor always consumes active power, which it converts into mechanical action. Reactive power is also required for the magnetisation of the motor but it doesn’t perform any action. In the diagram below the active and reactive power is represented by P and Q, which together give the power S.

The ratio between the active power (kW) and the reactive power (kVA) is known as the power factor, and is often designated as the cos ?. A normal value is between 0.7 and 0.9, when running where the lower value is for small motors and the higher for large ones.

Speed

The speed of an AC motor depends on two things: the number of poles of the stator winding and the main frequency. At 50 Hz, a motor will run at a speed related to a constant of 6000 divided by the number of poles and for a 60 Hz motor the constant is 7200 rpm.

This speed is the synchronous speed and a squirrel-cage or a slip-ring motor can never reach it. At unloaded condition the speed will be very close to synchronous speed and will then drop when the motor is loaded.

The difference between the synchronous and asynchronous speed also named rated speed is “the slip” and it is possible to calculate this by using the following formula:

Table for synchronous speed at different number of poles and frequency:

Torque

The starting torque for a motor differs significantly depending on the size of the motor. A small motor, e.g. ? 30 kW, normally has a value of between 2.5 and 3 times the rated torque, and for a medium size motor, say up to 250 kW, a typical value is between 2 to 2.5 times the rated torque. Really big motors have a tendency to have a very low starting torque, sometimes even lower than the rated torque. It is not possible to start such a motor fully loaded not even at D.O.L start.

The rated torque of a motor can be calculated using the following formula:

Slip-Ring Motors

In some cases when a D.O.L start is not permitted due to the high starting current, or when starting with a star-delta starter will give too low starting torque, a slip-ring motor is used. The motor is started by changing the rotor resistance and when speeding up the resistance is gradually removed until the rated speed is achieved and the motor is working at the equivalent rate of a standard squirrel-cage motor.

The advantage of a slip-ring motor is that the starting current will be lower and it is possible to adjust the starting torque up to the maximum torque. In general, if a softstarter is going to be used for this application you also need to replace the motor.

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Lecture 40 – Synchronous Machine

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