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US 11,909,346 B2Granted
Electric motor system
AssigneeDaikin Industries, Ltd.
InventorsTakaaki Ono, Yusuke Irino, Hiroshi Hibino
Life of this patent
Estimating the term…
Abstract
An electric motor system includes a drive shaft, a first electric motor, a second electric motor, a first inverter, a second inverter and a control unit. The drive shaft is rotatable around an axis. The first electric motor and the second electric motor rotate the drive shaft. The first inverter supplies power in order to generate a torque to the first electric motor. The second inverter supplies power in order to generate a torque to the second electric motor. The control unit controls the first inverter and the second inverter. The controller is 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.
Claims7
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.
2 more elements
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 a first combination of the first electric motor and the first inverter and a second combination of the second electric motor and the second inverter being more efficient than an other of the first and second combinations in a relatively low rotational speed range, and the other of the first and second combinations being more efficient than the one of the first and second combinations in a relatively high rotational speed range, and
- the control unit being configured to set a ratio, of an output torque of the one of the first and second combinations to an output torque of the other of the first and second combinations, higher in the relatively low rotational speed range than in the relatively high rotational speed range.
10 more elements
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,
- the first electric motor and the second electric motor including bearingless motors, and
- the control unit being configured to be able to change the ratio between the output torque of the first electric motor and the output torque of the second electric motor, based on a first index value indicating a bearing load of the first electric motor and a second index value indicating a bearing load of the second electric motor.
10 more elements
Dependencies are inferred from the claim text.