US 2020/0052577 A1 · CONTROL DEVICE OF ROTARY ELECTRIC MACHINE

Abstract

A control device of a rotary electric machine capable of preventing occurrence of electrical resonance when a conversion operation abnormality of a DC voltage converter occurs is provided. In a case that the DC voltage converter stops a conversion operation and the conversion operation abnormality that input/output voltages become equal occurs, when a vehicle speed proportional to an electric motor rotation number exceeds a torque limit start vehicle speed, i.e., when the electric motor rotation number exceeds a torque limit start rotation number, a torque limit control for limiting an output torque of the electric motor is executed. The torque limit start vehicle speed is set to a vehicle speed corresponding to a lower limit frequency of a predetermined frequency range where there is a high likelihood of an electrical resonance occurring in the DC voltage converter when the conversion operation abnormality occurs.

Claims11

Dependent claims

A control device of a rotary electric machine, comprising:

a battery;
an inverter, converting a direct current (DC) power supplied from the battery into an alternating current (AC) power to supply a drive power to the rotary electric machine;
and
a DC voltage converter, provided between the battery and the inverter,
wherein in a case that the DC voltage converter stops a conversion operation and a conversion operation abnormality in which input and output voltages become equal occurs, when a rotation speed of the rotary electric machine exceeds a predetermined rotation speed, a torque limit control that limits an output torque of the rotary electric machine is executed, and
the predetermined rotation speed is set to a rotation speed corresponding to a lower limit frequency of a predetermined frequency range in which there is a high likelihood of an electrical resonance occurring in the DC voltage converter when the conversion operation abnormality occurs.

3 more elements

Dependencies are inferred from the claim text.

Control device of rotary electric machine

Life of this patent

Control device of rotary electric machine

Life of this patent

Abstract

Claims11