Motor driving apparatus
AssigneeFuji Electric Fa Components & Systems Co., Ltd.
InventorsIkuya Sato, Akihiro Odaka
Life of this patent
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Abstract
A motor driving apparatus drives a motor by means of an AC/AC direct converter such as a matrix converter. The motor driving apparatus is provided with a current detecting section for detecting motor currents, a comparing section for detecting whether motor current detection values have exceeded a restriction level, an induction voltage calculating section for calculating induction voltages of the motor, a switching section, and a PWM pattern generating section. When the comparing section detects that the motor current detection values have exceeded the restriction level, the switching section supplies the induction voltages calculated by the induction voltage calculating section to the converter as output voltage instruction values.
Claims6
A motor driving apparatus for driving a motor by AC/AC direct converter for directly converting polyphase AC voltages to polyphase AC voltages having a desired magnitude and frequency, said motor driving apparatus comprising:
- current detecting means for detecting motor currents;
- comparing means for detecting whether detection values of the motor currents have exceeded a restriction level;
- induction voltage calculating means for calculating induction voltages of the motor;
- and
- means for supplying the induction voltages calculated by the induction voltage calculating means to the converter as second output voltage instruction values instead of first output voltage instruction values when the comparing means detects that the detection values of the motor currents have exceeded the restriction level.
Dependencies are inferred from the claim text.