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

• Current Assignee: Berg & Berg Enterprises, LLC (Carl Edwin Berg)
• Original Assignee: Light Engineering Corporation
• Inventors: Caamano, Ramon A.
• Primary Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US09/364,969
• Time in Patent Office: 255 Days
• Field of Search: 322/89, 322/90, 322/94, 322/29, 322/46
• US Class Current: 322/89
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/04 characterised by the material used for insulating the magnetic circuit or parts thereof
• CPC Class Codes: H02K 1/141 consisting of C-shaped cores
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/182 to stators axially facing the rotor, i.e. with axial or conical air gap
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 21/12 with stationary armatures and rotating magnets
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 29/10 using light effect devices
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

A device such as an electric motor, an electric generator, or a regenerative electric motor includes a rotor arrangement and a stator arrangement. The stator arrangement has a dielectric electromagnet housing and at least one energizable electromagnet assembly including an overall amorphous metal magnetic core. The overall amorphous metal magnetic core is made up of a plurality of individually formed amorphous metal core pieces. The dielectric electromagnet housing has core piece openings formed into the electromagnet housing for holding the individually formed amorphous metal core pieces in positions adjacent to one another so as to form the overall amorphous metal magnetic core. The device further includes a control arrangement that is able to variably control the activation and deactivation of the electromagnet using any combination of a plurality of activation and deactivation parameters in order to control the speed, efficiency, torque, and power of the device.

Claims

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.

2. An arrangement according to claim 1 wherein the position detector arrangement includes an encoder disk supported for rotation with the rotor and also includes an array of optical sensors arranged in close proximity to the encoder disk, the encoder disk having a plurality of concentric tracks with spaced apart position indicating openings form into each of the tracks, each of the optical sensors corresponding to an associated one of the concentric tracks and the optical sensors being positioned adjacent to its associated concentric track such that the sensor is able to detect the presence of the position indicating openings formed into its associated concentric track so as to be able to detect the position of the rotor relative to the stator.

3. An arrangement according to claim 2 wherein the controller includes means for using the rate at which encoder disk of the position detector arrangement detects changes in the position of the rotor relative to the stator to determine the rotational speed of the rotor relative to the stator when the rotor is rotating.

4. An arrangement according to claim 3 wherein the controller further includes a counter arrangement capable of counting in increments of time which allow each duty cycle to be divided into a multiplicity of time periods which the controller uses to control when to activate and deactivate the electromagnet.

5. An arrangement according to claim 1 wherein the rotor includes at least one permanent super magnet.

6. A method for controlling tile 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 method comprising the steps of:

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

b) using the signals to select and use predetermined device control settings to control the activation and deactivation of the electromagnets of the stator such that during operation of the device, for each duty cycle, the controller is able to control any combination of a plurality of 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.

7. A method according to claim 6 wherein the step of determining the position of the rotor includes the step of using an encoder disk supported for rotation with the rotor and an array of optical sensors arranged in close proximity to the encoder disk to detect the position of the rotor.

8. A method according to claim 7 wherein the encoder disk has a plurality of concentric tracks with position indicating openings formed into each of the tracks and wherein each of the optical sensors is positioned adjacent to an associated one of the concentric tracks such that the optical sensors detect the presence of the position indicating openings formed into its associated concentric track so as to allow the sensors to detect the position of the rotor relative to the stator.

9. A method according to claim 8 wherein the step of controlling the activation and deactivation of the electromagnet includes the step of using rate at which the encoder disk detects changes in the position of the rotor relative to the stator to determine the rotational speed of the rotor relative to the stator when the rotor is rotating.

10. A method according to claim 9 wherein the step of controlling the activation and deactivation of the electromagnet includes the step of using the combination of (i) the rotational speed of the rotor and (ii) a counter arrangement capable of counting in increments of time which allow each duty cycle to be divided into a multiplicity of time periods to control when to activate and deactivate the electromagnet.

11. A method according to claim 6 wherein the rotor includes at least one permanent super magnet.

12. A method of conditioning the electrical output of an electric generator driven by a input drive device, the generator including a stator assembly having at least one dynamically activatable and deactivatable stator coil and a rotor assembly, the method comprising the steps of:

a) determining the position and rotational speed of the rotor assembly relative to the stator assembly at given times and producing corresponding position and rotational speed signals; and

b) using the position and rotational speed signals, and variably controlling the activation and deactivation of the stator coil to effect parameters including

(I) a duty cycle activation time,

(ii) start/stop points of the duty cycle activation time,

(iii) modulation or the duty cycle activation time

such that the electrical output of the generator is conditioned to a desired electrical output without requiring the use of additional electrical power conditioning devices.

13. A method according to claim 12 wherein the input drive device is a wind mill.

14. A method according to claim 12 further including the step of using a portion of the electrical power generated by the generator to drive the generator as an electric motor.

15. A method according to claim 14 wherein the generator is driven as an electric motor in a way which reduces the amount of resistance the generator places on the input drive dvice.

16. A method according to claim 14 wherein the generator is driven as an electric motor in a way which increases the amount of resistance the generator places on the input drive device.