FIELD: electrical engineering; electric drives.
SUBSTANCE: proposed device designed for limiting induction motor shaft torque depends for its operation on using information about active input power directly proportional to torque and has switch, current transformer and potential transformer inserted in motor stator circuit, as well as amplifier, two rectifiers, matching unit, scaled resistor, and resistor optocoupler. Current transformer output is connected to input of first rectifier whose output is connected through matching device to photodiode of resistor optocoupler. Potential transformer output is connected to input of second rectifier whose output is connected through scaled resistor to amplifier input; connected to amplifier feedback circuit is photoresistor of resistor optocoupler. Amplifier output is connected through threshold unit to switch input.
EFFECT: enhanced reliability and precision of motor shaft torque limiting, enhanced noise immunity of device.
1 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| SHAFT TORQUE LIMITING DEVICE FOR INDUCTION MOTOR | 2004 |
|
RU2259003C1 |
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|
RU2283482C1 |
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|
RU2269752C1 |
| DYNAMIC BRAKING DEVICE FOR THREE-PHASE INDUCTION MOTOR | 2002 |
|
RU2227364C2 |
| DEVICE FOR LIMITING TORQUE AT MOTOR SHAFT | 0 |
|
SU1056351A1 |
| DEVICE FOR LIMITING INDUCTION MOTOR SHAFT TORQUE | 0 |
|
SU817955A1 |
| 0 |
|
SU1780138A1 | |
| DEVICE FOR DYNAMIC BRAKING OF THREE-PHASE INDUCTION MOTOR | 2003 |
|
RU2242082C1 |
| DEVICE FOR MONITORING TORQUE ON ELECTRIC MOTOR SHAFT | 0 |
|
SU964492A2 |
