Motor drive apparatus and method

Details Motor drive apparatus and method Motor drive apparatus and method

2011-03-29

2011-03-29

Benson, Walter (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C318S268000, C318S724000, C318S809000, C318S811000, C388S809000, C388S825000

Reexamination Certificate

active

07917017

ABSTRACT:
If a PWM duty instruction D1determined by a duty calculation circuit exceeds an upper limit value, a duty signal processing circuit in a motor drive apparatus divides a switching current supply period in each of the phases into a first current supply period and a second current supply period. In the first current supply period, the duty is set to the upper limit value. In the second current supply period, the duty is set to 100%, and the length of the second current supply period is set depending upon the duty instruction.

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Machine traslation of JP 06-030594 A.
Office Action dated Sep. 11, 2009 in corresponding Chinese patent application No. 2007 1018 63041 (and English translation).
Decision of Rejection mailed on Oct. 11, 2010 issued from the Chinese Patent Office in the corresponding Chinese patent application No. 200710186304.1 (with English translation).

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