Motor Drive Circuit Insulation Resistance Detection

The detection process is segmented into two distinct detection operations: first detection operation for detecting insulation resistance of the motor drive circuit, and second detection operation for detecting insulation resistance of the motor. This segmentation allows the system to measure different insulation resistances separately by switching the state of switch devices, resolving the contradiction by enabling comprehensive detection without requiring a completely separate detection system for each component.

The same detection portion and circuit structure are used to perform multiple detection functions - detecting insulation resistance of both the motor drive circuit and the motor. By utilizing the existing circuit components (switch devices, detection portion) for dual purposes through different operational states, the invention achieves comprehensive insulation detection without proportionally increasing device complexity.

The motor drive circuit performs self-diagnosis by using its own switch devices and circuit structure to detect insulation resistance. The detection portion utilizes the existing power supply lines and switch devices already present in the circuit, allowing the system to monitor its own insulation status without requiring entirely separate external detection equipment, thus improving reliability while minimizing additional complexity.

The insulation resistance detection is performed at predetermined timing before normal motor operation begins. The control portion controls the switch devices to appropriate states for detection, and only after successful detection does the system transition to normal operation. This preliminary detection ensures safety and reliability are verified before operation, preventing electrical leaks while integrating detection into the existing control sequence without continuous complexity.