Patent ID: 8258664
Filing Date: 2012-09-04
Classification: F25B,H02P,Y02B

Abstract:
1. A vapor compression system comprising: a compressor, a condenser and an evaporator connected in a closed refrigerant loop; a motor connected to the compressor to power the compressor, the motor comprising: a first rotor portion and a first stator portion configured as a permanent magnet motor; a second rotor portion and a second stator portion configured as a reluctance motor, the second rotor portion comprising a reluctance-type rotor, and the second stator portion comprising electromagnetic windings capable of inducing a rotary magnetic field; the first rotor portion and the second rotor portion attached to a common drive shaft of the compressor; and a controller configured to operate the reluctance motor to generate start-up torque and initiate rotation of the drive shaft until the drive shaft achieves a predetermined rotational speed and to operate the permanent magnet motor to rotate the drive shaft between the predetermined rotational speed and a maximum rotational speed.