Synchronous motor controller, synchronous motor control method

摘要

A controller for a conventional synchronous motor is configured to produce desired output characteristics. The controller generates a drive current for based on a current command, has a motor correcting section and a gain adjusting section which output a compensated current command based on the current command according to a compensating transfer function for cancelling a first transfer function showing a first torque response characteristic of the synchronous motor and replacing it with a second transfer function showing a second torque response characteristic, and a current controller which generates a drive current corresponding to the compensated current command.

主权项

1. A synchronous motor controller comprising at least a speed controller generating a current command and outputting the generated current command, and a current controller generating a drive current corresponding to the current command and outputting the generated drive current, and which supplies the drive current from the current controller to a synchronous motor using a permanent magnet as a magnetic pole of a rotor to drive the synchronous motor, in which:
a torque response characteristic of the synchronous motor comprises a first torque response characteristic A defined by a first transfer function, the torque response characteristic representing a relationship between the current command output from the speed controller and an output torque of the synchronous motor driven by the drive current generated by the current controller corresponding to the current command output from the speed controller; the synchronous motor controller further comprises a current command compensating section which compensates the current command output from the speed controller according to a compensating transfer function to generate a compensated current command causing the torque response characteristic representing the relationship between the current command output from the speed controller and the output torque of the synchronous motor to be a second torque response characteristic B that is a torque response characteristic other than the first torque response characteristic A and is defined by a second transfer function, and outputs the generated compensated current command to the current controller; the compensating transfer function includes a function obtained by dividing the second transfer function by the first transfer function; and the current controller is configured to generate a drive current corresponding to the compensated current command output from the current command compensating section and output the generated drive current to the synchronous motor.