Starting and synchronizing system for line-start permanent magne

Details Starting and synchronizing system for line-start permanent magne Starting and synchronizing system for line-start permanent magne

1998-03-13

1999-01-12

Ro, Bentsu

Electricity: motive power systems

Motor load, armature current or force control during...

318705, H02P 150

Patent

active

058595139

ABSTRACT:
A system for preventing objectionable large torque pulsations during the starting and synchronization of a line-start permanent magnet motor compares motor speed with motor synchronous speed and power source phase with the motor back-emf phasor. The motor starting armature is coupled to the power source and the PM armature is disconnected from the power source before motor speed has reached to within a predetermined margin of synchronous speed and before the back-emf phasor has dropped below a predetermined phase difference. After motor speed has approached synchronous speed to within the margin and the phase difference has dropped below the predetermined phase difference, connections are reversed so that the starting armature is disconnected from the power source and the PM armature is coupled to the power source.

REFERENCES:
patent: 4459530 (1984-07-01), Klatt
patent: 4876491 (1989-10-01), Squires et al.
patent: 5761376 (1998-06-01), Gering

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