Ventilation blower

A ventilation blower comprising:

• an inverter main circuit including a plurality of switching elements to be switched to convert direct-current power into three-phase alternating-current power;
• a motor body including a stator and a rotor and to be driven by the inverter main circuit;
• a motor control circuit to control the inverter main circuit;
• and
• a memory, wherein
• the memory stores an angular velocity of the rotor and a torque current value at a first operation point at which to obtain a first air volume on a first load characteristic, and the angular velocity and the torque current value at a second operation point at which to obtain a second air volume on the first load characteristic, the second air volume being different from the first air volume,
• the motor control circuit calculates, from the angular velocity and the torque current value at the first operation point and the angular velocity and the torque current value at the second operation point, the angular velocity and the torque current value at a third operation point at which to obtain a third air volume on the first load characteristic, and
• the motor control circuit causes the inverter main circuit to drive the motor body with the angular velocity and the torque current value at the third operation point.