TORQUE RIPPLE REDUCTION DEVICE OF A MOTOR DRIVEN POWER STEERING SYSTEM, CAPABLE OF REDUCING A TORQUE RIPPLE THROUGH A REVERSED PHASE COMPENSATOR

摘要

PURPOSE: A torque ripple reduction device of a motor driven power steering system is provided to reduce the generation of noise and vibration by compensating a torque ripple with respect to the change of a magnetic flux part current.;CONSTITUTION: A torque ripple reduction device of a motor driven power steering system comprises a motor position angle sensor(10), a storage part(40), a weak magnetic flux controller(30), a reversed phase compensator(50), and a steering logic controller(20). The motor position angle sensor senses a motor position angle according to the operation of a motor(70). The storage part stores a compensation signal table according to the motor position angle. The weak magnetic flux controller produces a magnetic flux part current in order to regularly control the operation power of the motor. The reversed phase compensator calculates a reversed phase compensation signal, multiplies a gain according to the level of a torque part current and the magnetic flux part current from the steering logic controller in order to produce a compensation current for reducing a torque ripple.;COPYRIGHT KIPO 2013;[Reference numerals] (10) Motor position angle sensor; (20) Steering logic controller; (30) Weak magnetic flux controller; (40) Storage part; (50) Reversed phase compensator; (60) Motor controller; (70) Motor; (AA) Motor position angle; (BB) Torque part current; (CC) Flux part current; (DD) Compensation current