| 摘要 |
PROBLEM TO BE SOLVED: To provide multifunctional electronic method and device for protecting an electric motor. SOLUTION: A multifunctional system has current detection annular magnetic circuits CT1, CT2, and CT3 and the related circuits, and related circuits for temperature detection PTC resistors S1, S2, and S3 that are arranged at a heat conduction part being related to each coil winding of an electric motor. An analog/digital converter U6 provides binary coding input for a micro control device. A micro control device executes a protection subroutine and controls an output switch Q4, and then controls the excitation state of a relay K1. |
