Pulse width modulation control apparatus and method

Details Pulse width modulation control apparatus and method Pulse width modulation control apparatus and method

1991-09-09

1993-11-23

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318599, 363 41, 363132, H02P 540

Patent

active

052647757

ABSTRACT:
A controller for a multi-phase brushless DC motor which pulse width modulates the switching devices of a bridge controller, thereby energizing the phase windings of the motor in such a manner as to eliminate current flow in the inactive phase windings. The bridge switching devices are modulated over distinct segments of the total conduction time. A pattern of modulation, constant conduction, and modulation is established which allows circulating current to flow only through active phase windings, effectively eliminating any undesirable braking torque resulting from current flow through inactive phase windings which lowers the overall motor efficiency.

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Paper entitled "Four-Quardrant Sensorless Brushless ECM Drive", Becerra et al, Conference Record of 6th Annual Applied Power Electronics Conference, CH2992-6/91/0000-0202, pp. 202-209, May 1991.

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