AC motor drive controller

Details AC motor drive controller AC motor drive controller

2011-03-22

2011-03-22

Benson, Walter (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S810000, C318S807000, C318S767000, C318S727000

Reexamination Certificate

active

07911177

ABSTRACT:
An overmodulation PWM controller includes a voltage instruction calculation unit which calculates a d axis voltage instruction and a q axis voltage instruction in which a voltage amplitude exceeds a peak value of a triangular wave carrier; a voltage instruction correction unit which corrects the d axis voltage instruction and the q axis voltage instruction so that a pulse width modulation voltage applied to an AC motor has a fundamental wave amplitude corresponding to the voltage instruction amplitude, according to the synchronization value K which is the number of the triangular carriers per one cycle of the phase voltage instruction; and a voltage instruction conversion unit which converts the corrected d axis voltage instruction and the q axis voltage instruction into a phase voltage instruction. The pulse width modulation voltage is controlled according to the result of comparison between the phase voltage instruction and the triangular wave carrier.

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International Search Report for International Application No. PCT/JP2008/061500, issued Sep. 16, 2008.

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