Patent ID: 11909346
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 0:
1. An electric motor system comprising: a drive shaft rotatable around an axis; a first electric motor and a second electric motor each configured to rotate the drive shaft; a first inverter configured to supply power in order to generate a torque to the first electric motor; a second inverter configured to supply power in order to generate a torque to the second electric motor; and a control unit configured to control the first inverter and the second inverter, the controller being configured to be able to change a ratio between an output torque of the first electric motor and an output torque of the second electric motor, each of the first electric motor and the second electric motor having a rotor and a stator, the rotor of the first electric motor being separate from the rotor of the second electric motor, the stator of the first electric motor being separate from the stator of the second electric motor, one of the first and second electric motors being more efficient than an other of the first and second electric motors in a relatively low rotational speed range, and the other of the first and second electric motors being more efficient than the one of the first and second electric motors in a relatively high rotational speed range, and the control unit being configured to set the ratio, of the output torque of the one of the first and second electric motors to output torque of the other of the first and second electric motors, higher in the relatively low rotational speed range than in the relatively high rotational speed range.