Apparatus and method for measuring average motor current

Details Apparatus and method for measuring average motor current Apparatus and method for measuring average motor current

1996-08-14

1998-01-20

Ip, Paul

Electricity: motive power systems

Limitation of motor load, current, torque or force

318432, 318599, H02K 2904

Patent

active

057104956

ABSTRACT:
Apparatus and method (10, 40) for measuring an average motor current in a pulse width modulation driven motor are provided. A sensor (20) is coupled to the motor to measure a motor winding current. A first current source (26) generates a first current generally proportional to the motor winding current. A second current substantially proportional to a chopped output voltage is also produced and subtracted from the first current. A circuitry (28) receives the difference between the first and second currents and generates an output voltage indicative of the average motor current. The output voltage is chopped by a circuit (32, 34) that produces a waveform at substantially the same duty cycle and phase as the pulse width modulation waveform driving the motor.

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