US Patent 10396701 Motor control device, blowing device, and cleaner

A motor control device of a motor includes voltage acquisition circuitry that acquires a drive voltage of the motor; rotational speed acquisition circuitry that acquires a rotational speed of the motor; setting circuitry that sets a rotational speed instruction value of the motor; calculation circuitry that calculates a rotational speed threshold value of the motor; change circuitry that changes the rotational speed instruction value; and storage circuitry that stores reference data. The reference data includes at least three types of reference value sets each including a reference drive voltage value, a reference rotational speed instruction value, and a reference rotational speed threshold value. The calculation circuitry performs a proportional calculation, a current rotational speed instruction value, and the reference value set to calculate the rotational speed threshold value.