60 RPM Synchronous Motor by Mica Sales And Engineering

• Instant start, stop & reversible.
• Low speed 60 RPM @ 50 Hz.
• Torque from 2 kg.cm to 100 kg.cm (11 models).
• Insulation Class-B.
• starting, running & stalling currents are same.
• Magnetically rotor can be locked by D.C. applying.
• Power coated cast aluminum body with ss shaft

CHARACTERISTICS

• A.C. Operation : motor can be directly connected to 240 V;50Hz, supply along with factory supplied R-C network in series with one of the stator winding. Change of this R-C network from one winding to other results reversal of motor direction. Single pole three position switch can be used for Forward, Reverse & Off control. Metal varistor oxide may be used to minimize the switch contact arcing
• Starting : Motor start within 1 1/2 Cycles of its applied frequency & will reach 60 RPM within 5 to 30 mS at 50 Hz. Since motor has no significant current rise on starting, this motor is ideal to an application which requires six or more starts per minute.
• Stalling : Motor will not be overheated if stalled because starting, full load and no load currents are same. However prolonged operation against a solid stop will eventually produce bearing failure due to the resultant shaft vibrations.
• Inertia Limitations : Since the motors are having extremely rapid starting, there is a limit to the inertia load at which the motor will start from rest. Addition of resilient coupling with app. 5 degree of rotational freedom or gearing with backlash between motor & load can increase the permissible inertia load handing capability.
• Phase Shift Network : The values of R-C network have considerable effect on motor performance. They have been chosen by us in such a manner that no reverse torque is produced when voltage is applied. R-C values should not be varied more than 5% so as to enhance smoother starting, give quieter operation, maximize torque & improve efficiency. Other values may be recommended by the factory for the continuous duty specific OEM application
• Stopping & Holding (Braking) : Due to magnetic rotor, these motors decelerate faster than conventional motors & stop within 5 degree after turnoff with no external inertia. Application of D.C. supply to one or both motor windings after removal of A.C. supply results deceleration time 1/10th to 1/20th those available with conventional motor & the motor shaft is electrically locked after the stop.
• Back Driving : These motors act as generators when back driven. Rotating in access of 1400 RPM is not recommended because high voltages can be generated. At 1400 RPM or below suitable precautions for protection of personnel/phase shift capacitor & any other connected circuitry may be necessary when back driving.
• 60 Hz Operation : These motors may be operated on 60 Hz, but may require a different R-C network, the factory must be consulted. Torque rating should be similar to those shown for 50Hz & speed is 72 RPM @ 60 Hz.