Current compensated choke filter for multi-phase motor drives

Details Current compensated choke filter for multi-phase motor drives Current compensated choke filter for multi-phase motor drives

1999-02-09

2000-03-14

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 336160, H02K 1100, H01F 1700

Patent

active

060376864

ABSTRACT:
Each torque-producing phase current of a multi-phase motor is passed through a filter which includes an R/C shunt to ground and a series, current-compensated choke. Each choke has a winding in series with each phase so that the net current generated by phase currents in the windings is zero, and therefore the net flux generated by phase currents in the highly permeable core of the choke is zero at all times. However, there is significant inductive reactance created by the non-counterbalanced motor leakage currents, which prevent leakage currents from circulating through the motor. Thus, torque-producing motor currents can accurately be measured for feedback, without pollution from leakage currents. LEM current transducers allow use of small, proportional currents in the measuring and suppress inter-phase coupling.

REFERENCES:
patent: 3123764 (1964-03-01), Patton
patent: 4129820 (1978-12-01), Brock
patent: 4663700 (1987-05-01), Kahkipuro
patent: 4853664 (1989-08-01), Asakura
patent: 4907246 (1990-03-01), Kleiner
patent: 5525951 (1996-06-01), Sunano et al.

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