Patent attributes
A motor controller includes a power converter energizing a motor based on a commutation signal, the motor including a rotor provided with a permanent magnet and a coil-wound stator; an estimator estimating rotor rotational speed and rotational position; a controller outputting the commutation signal to the power converter, the commutation signal taking a predetermined energization pattern based on a command rotational speed during startup, and being outputted based on the rotational position estimated by the estimator during position estimation; a current detector detecting current flowing in the coil winding; an input power calculator calculating input power of the motor by voltage applied to the coil winding and the current detected by the current detector; an output power calculator calculating output power of the motor by the rotational speed estimate; and a rotational abnormality determiner determining occurrence of rotational abnormality based on comparison of the input power with the output power.
