Patent ID: 11863101
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A driving apparatus comprising:
an inverter generating a three-phase alternating-current voltage from a direct-current voltage in accordance with a drive signal based on a voltage command and outputting the three-phase alternating-current voltage to a permanent-magnet motor, the permanent-magnet motor comprising a permanent magnet;
a current detector detecting a motor current flowing through the permanent-magnet motor; and
a controller generating the voltage command to control an operation of the inverter and estimating a temperature of the permanent magnet to perform a protection operation on the inverter on a basis of the motor current and an overcurrent protection threshold, wherein
the controller sets the overcurrent protection threshold on a basis of a magnet temperature estimated value of the permanent magnet and any one of a control computation period of the controller, an output voltage frequency of the inverter, and a carrier frequency based on the output voltage frequency of the inverter,
the controller sets the control computation period on a basis of the magnet temperature estimated value, and
the controller sets the carrier frequency on a basis of the output voltage frequency of the inverter and the control computation period set on a basis of the magnet temperature estimated value.