Motor driving device and motor driving method
AssigneeFanuc Corporation
InventorsYasuyuki MATSUMOTO, Masaya TATEDA, Keitarou INAGAKI
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Abstract
A motor driving device includes N units (N is a natural number equal to or greater than 2) of inverters configured to control N units of motors, respectively, a×N units (a is a natural number) of cables configured to allow connection between the N units of inverters and the N units of motors, respectively, and a PWM signal output unit configured to transmit a PWM signal to the N units of inverters. The N units of inverters and the a×N units of cables are divided into M groups (M≤N). The PWM signal output unit outputs the PWM signal for driving at least one inverter belonging to each group of the M groups so that the PWM signals have phase differences shifted by 360 degrees/M among the groups.
Claims6
A motor driving device comprising:
- N units of motors, the N being a natural number equal to or greater than 2;
- N units of inverters configured to control the N units of motors, respectively;
- a×N units of cables configured to allow connection between the N units of inverters and the N units of motors, respectively, the a being a natural number;
- and
- a PWM signal output unit configured to transmit a PWM signal to the N units of inverters, wherein
- the N units of motors, the N units of inverters, and the a×N units of cables are divided into M groups, wherein the M is a natural number equal to or less than N and equal to or greater than 2, and
- the PWM signal output unit outputs the PWM signal for driving at least one inverter belonging to each group of the M groups so that the PWM signals have phase differences shifted by 360 degrees/M among the groups.
A motor driving method for controlling a motor driving device, the motor driving device comprising:
- N units of motors, the N being a natural number equal to or greater than 2;
- N units of inverters configured to control the N units of motors, respectively, the N being a natural number equal to or greater than 2;
- and
- a×N units of cables configured to allow connection between the N units of inverters and the N units of motors, respectively, the a being a natural number,
- the motor driving method comprising a step of:
- dividing the N units of motors, the N units of inverters, and the a×N units of cables into M groups, the M being a natural number equal to or less than N and equal to or greater than 2, wherein
- PWM signals each for driving at least one inverter belonging to each group of the M groups have phase differences shifted by 360 degrees/M among the groups.
Dependencies are inferred from the claim text.