| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor controller capable of continuing driving of a motor even when a rotation sensor has some malfunction. <P>SOLUTION: A sensor malfunction determination section 25 determines the presence/absence of malfunction of a resolver 2. In a normal case where the resolver 2 has no malfunction, a motor 1 is driven by using an output of the resolver 2. When the resolver 2 has some malfunction, the motor 1 is driven by sensorless control, using an estimated rotational position calculated by a position estimation section 60. In a low-speed range where a rotor rotational position is estimated by a position estimation section 61 for low-speed range during the sensorless control, a target current upper limit is limited to a value capable of obtaining rotor position estimation accuracy of a fixed level or higher. <P>COPYRIGHT: (C)2013,JPO&INPIT |
