Electric current compensation circuit for brushless motors for r

Details Electric current compensation circuit for brushless motors for r Electric current compensation circuit for brushless motors for r

1996-10-16

1998-10-13

Masih, Karen

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318799, 318800, 318801, 318802, 318803, 318804, 318805, 318806, 318807, 318808, 318809, 318810, 318811, 318812, 318813, 318814, 318815, 31856822, 318432, 318433, 318434, H02P 528

Patent

active

058217258

ABSTRACT:
An electric current compensation circuit for use with a multiple-phase burshless motor to reduce ripples in the output torque is disclosed. It contains a plurality of electric current compensation loops each for a respective phase winding and each of the electric compensation loops contains: (a) a first input for receiving a line current from the driver; (b) a second input for receiving the compensation current from the motor sensor; (c) a forward rectifying circuit for forwardly rectifying the line current and the compensation current; (d) a reverse rectifying circuit for reversely rectifying the line current and the compensation current; and (e) a summation circuit for summing the forwardly rectified compensation current and the reversely rectified compensation current and outputting a synthetic current to a phase winding of the motor. Each time the phase is changed, the electric current compensation circuit is triggered causing the synthetic current to be sent to the motor to allow the motor to generate an output torque with reduced ripple.

REFERENCES:
patent: 5043643 (1991-08-01), Hedlund et al.
patent: 5283726 (1994-02-01), Wilkerson
patent: 5294876 (1994-03-01), Jonsson
patent: 5451846 (1995-09-01), Peterson et al.

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