Abstract: A manufacturing method of a rotor having insertion holes arranged in a circumferential direction around an axis and a magnet and resin placed in each insertion hole includes: a first step of placing the magnet and resin in each first insertion hole, and identifying an unbalance position by rotating the rotor at a first rotation speed; a second step of placing the magnet and resin in each second insertion hole in which the magnet is not placed in the first step, and rotating the rotor at a second rotation speed; and a third step of placing the magnet and resin in each third insertion hole in which the magnet is not placed in the first step, and rotating the rotor at a third rotation speed smaller than the second rotation speed. The second and third insertion holes are relatively far from and close to the unbalance position respectively.

Abstract: A motor device for a vehicle includes a stator, a rotor, a bearing, an inverter, and a controller. The stator is attached into a housing and includes a concentrated winding coil. The rotor includes a permanent magnet. The bearing supports a rotating shaft of the rotor. The inverter controls an energization state of the concentrated winding coil. If a rotational speed of the rotor is greater than a threshold, the controller outputs a control signal to the inverter to execute field weakening control, and thereby makes a potential difference between the housing and the rotating shaft lower than a withstand voltage of the bearing. The control signal controls the energization state of the concentrated winding coil. The field weakening control generates magnetic flux of the concentrated winding coil in a direction of weakening magnetic flux of the permanent magnet.

Abstract: A motor device for a vehicle includes a stator, a rotor, a bearing, an inverter, and a controller. The stator is attached into a housing and includes a concentrated winding coil. The rotor includes a permanent magnet. The bearing supports a rotating shaft of the rotor. The inverter controls an energization state of the concentrated winding coil. If a rotational speed of the rotor is greater than a threshold, the controller outputs a control signal to the inverter to execute field weakening control, and thereby makes a potential difference between the housing and the rotating shaft lower than a withstand voltage of the bearing. The control signal controls the energization state of the concentrated winding coil. The field weakening control generates magnetic flux of the concentrated winding coil in a direction of weakening magnetic flux of the permanent magnet.