Patent ID: 8897964

Claim:
A motor control device that calculates an estimated speed value that is an estimated value of a rotation speed of a motor, comprising: a memory; and a processor configured to: store, in the memory, characteristic information that indicates a correlation between a rotation speed and a current of the motor during operation, set a rotation speed characteristic value that is a reference value of the rotation speed of the motor during operation and a current characteristic value that is a reference value of the current of the motor during operation on the basis of the characteristic information, and calculate, by the processor, the estimated speed value on the basis of a current value that is a measured value of the current that is supplied to the motor, a voltage value that is a measured value of a voltage that is applied to the motor, the current characteristic value, a voltage characteristic value that is a reference value of the voltage of the motor during operation, which is measured at a time when the current value is the current characteristic value, the rotation speed characteristic value and a counter-electromotive force constant.