Renesas Electronics Corporation

Akane Abe

Hiroshi Shimada

Yuji Shimizu

Yoshifumi Ikenaga

To provide a correction method of resolver correction device and resolver correction device that can reduce rotation angle (the rotation speed) detection error caused by resolver. An excitation signal supply circuit supplies an excitation signal of an excitation frequency to the resolver during a normal operation, for supplying the excitation signals of a plurality of frequencies including the excitation frequency to the first phase shifter or the second phase shifter during a calibration operation. A shift amount searching circuit searches the first shift amount setting value for each frequency of the excitation signal such that the first shift amount becomes 45 degrees, and the second shift amount setting value for each frequency of the excitation signal such that the second shift amount becomes 135 degrees, while referring to the detection result of the phase difference detection circuit during the calibration operation, and stores in the correction table.

Resolver correction device and method of correcting the same

A control device capable of accurately detecting a rotor rotation angle is provided. The control device includes variable resistors Rto Rfor converting the currents flowing in the four-phase coils of the current detection resolver into voltages, two differential amplifiers for a first phase signal of the voltage difference between the detection voltages of the variable resistors Rand R, and a second phase signal of the voltage difference between the detection voltages of the variable resistors Rand Rrespectively, two phase shifters for shifting the phase of the first phase signal and the second phase signal respectively, a synthesizer for a phase modulation signal by synthesizing the phase shifted first phase signal and the phase shifted second phase signal, and an adjuster for adjusting the resistance values of the variable resistors Rto Rbased on the width of the envelope of the phase modulation signal.

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Tokyo, Japan

Akane Abe