METHOD FOR CONROLLING SYNCHRONOUS MOTOR HAVING NO POSITION SENSOR

摘要

PROBLEM TO BE SOLVED: To perform excellent control over a low speed region to a high speed region while a constitution can be made at a low cost without using a position sensor. SOLUTION: A control arithmetic part 601 estimates a deflection angle ϕ, and outputs a command value signal to an inverter device 602 so as to decrease its inverter angular frequency when the deflection angle ϕ is positive so as to increase the inverter angular frequency when the deflection angle ϕ is negative. The inverter device 602 controls a synchronous motor 604 by the inverter angular frequency in accordance with the command value signal.