Motor controller and electric power steering system

摘要: A motor controller and an electric power steering system including the are provided. The has a microcomputer. When on time of one lower potential-side FETs corresponding to respective phases in drive circuit becomes shorter than detection for detecting phase current value, microcomputer estimates value undetectable based values two other relevant FET (blind estimation). is performed blind estimation, control signals output, by which switching state arm maintained loss caused operation compensated for.