Patent ID: 9112437
Filing Date: 2015-08-18
Classification: G01R,H02H,H02J,H02P

Abstract:
1. A method of detecting disconnection of a power cable in an inverter system, the method comprising: driving of a motor; determining if a driving speed of the motor exceeds a reference speed; determining if a phase current instruction value to drive the motor is greater than a first reference value if the driving speed of the motor exceeds the reference speed; determining if an actual phase current applied to the motor is less than a second reference value if the phase current instruction value is greater than the first reference value; and turning off a main relay if the actual phase current is less than the second reference value and no longer driving the motor, wherein the first reference value is set to 50% of a theoretical current instruction value corresponding to a torque instruction; and wherein the second reference value is set to a value greater then zero.