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Electric motor or generator

  • US 6,049,197 A
  • Filed: 07/31/1999
  • Issued: 04/11/2000
  • Est. Priority Date: 12/27/1996
  • Status: Expired due to Term
First Claim
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1. An arrangement for controlling the rotational speed, efficiency, torque, and power of a device selected from the group of devices consisting of an electric motor, an electric generator, and a regenerative electric motor, the device including a rotor supported for rotation along a predetermined rotor path about a given rotor axis and a stator having a plurality of dynamically activatable and deactivatable electromagnets including amorphous metal magnetic cores, the electromagnets being spaced apart from one another adjacent to the predetermined rotor path such that movement of a particular point of the rotor from a given point adjacent one electromagnet to a given point adjacent the next successive electromagnet defines one duty cycle, the arrangement comprising:

  • a) a position detector arrangement for determining the position and rotational speed of the rotor relative to the stator at given times in a duty cycle and producing corresponding signals; and

    b) a controller responsive to the signals for controlling the activation and deactivation of the electromagnets of the stator using device control settings such that during the operation of the device, for each duty cycle, the controller is able to control any combination of a plurality or activation and deactivation parameters in order to control the speed, efficiency, torque, and power of the device,wherein the activation and deactivation parameters include(I) a duty cycle activation time which is the duration of time from the first time in which an associated electromagnet of the stator is activated until the last time that electromagnet is deactivated for each duty cycle,(ii) start/stop points of the duty cycle activation time which is the time at which the duty cycle activation time starts and stops during the duty cycle relative to the rotational position of the rotor, and(iii) the modulation or the duty cycle activation time which is the pulse width modulating of the electromagnet by activating and deactivating the electromagnet during what would otherwise be the continuous duty cycle activation time.

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