Brushless repulsion motor speed control system

• US 7,375,488 B2
• Filed: 05/26/2006
• Issued: 05/20/2008
• Est. Priority Date: 11/04/2003
• Status: Expired due to Fees

• Current Assignee: Dynamotors Incorporated
• Original Assignee: Dynamoters Incorporated
• Inventors: Jones, William M.
• Primary Examiner(s): Donovan; Lincoln
• Assistant Examiner(s): McCloud; Renata
• Application Number:
  US11/442,211
• Publication Number:
  US 20060261776A1
• Time in Patent Office: 725 Days
• Field of Search: None
• US Class Current: 318/725
• CPC Class Codes: H02P 25/102 Repulsion motors

Abstract

A system for controlling the speed of a brushless repulsion motor having a series of switches mounted on a rotating armature for shorting circumferentially spaced armature coils comprising first stationary signaling means and a plurality of rotating detectors for activating said switches; second stationary signaling means for speed control; a plurality of markers on the rotating armature; a speed detector for detecting the speed of the rotating markers and generating a speed feedback signal; means for generating a speed command signal; an error calculator for comparing the speed feedback and speed command signals and generating an error signal; and a controller for controlling the signaling means based on the error signal.

Claims

1. A system for controlling the speed of a brushless repulsion motor having a stator and a rotating armature with a series of switches mounted on a printed circuit board on the rotating armature for shorting circumferentially spaced armature coils, the system comprising:

LED signaling means and a plurality of rotating detectors for activating and deactivating the switches;

first optical sensing means for sensing the speed of the rotating armature and generating a speed feedback signal;

generating means on the motor for generating a speed command signal;

an error calculator on the motor for comparing the speed feedback and speed command signals and generating an error signal;

an LED controller on the motor for controlling the LED signaling means based on the error signal, wherein the LED controller is operative to adjust the LED signaling means in the positive or negative torque sector to correct the speed of the rotating armature; and

second optical sensing means for sensing the position of the rotating armature.

2. A system for controlling the speed of a brushless repulsion motor having a stator and a rotating armature with a series of switches mounted on a printed circuit board on the rotating armature for shorting circumferentially spaced armature coils, the system comprising:

LED signaling means and a plurality of rotating detectors for activating and deactivating the switches;

a first stationary photo transmitter on the motor for sending a signal to be used for speed control;

a plurality of markers on the rotating armature for speed control;

a first stationary photo detector on the motor for detecting the speed of the rotating markers and generating a speed feedback signal;

generating means on the motor for generating a speed command signal;

an error calculator on the motor for comparing the speed feedback and speed command signals and generating an error signal;

an LED controller on the motor for controlling the LED signaling means based on the error signal, wherein the LED controller is operative to adjust the LED signaling means in the positive or negative torque sector to correct the speed of the rotating armature;

a second stationary photo transmitter on the motor for sending a signal to be used for position control;

a position marker on the PC board of the rotating armature; and

a second stationary photo detector on the motor for detecting the position marker to determine the position of the armature coils and sending a position feedback signal to the controller for maintaining the set speed.

3. The system defined in claim 2, further comprising:

at least one position marker associated with each coil.

4. The system defined in claim 2, wherein the markers are mounted flat on the armature.

5. The system defined in claim 2, wherein the markers are mounted on the peripheries of the armature.

6. A system for controlling the speed of a brushless repulsion motor having a stator and a rotating armature with a series of switches mounted on a printed circuit board on the rotating armature for shorting circumferentially spaced armature coils, the system comprising:

LED signaling means and a plurality of rotating detectors for activating and deactivating the switches;

a plurality of magnetic markers on the PC board of the rotating armature for speed control;

a first stationary magnetic pickup means on the motor for detecting the speed of the rotating markers and generating a speed feedback signal;

generating means on the motor for generating a speed command signal;

an error calculator on the motor for comparing the speed feedback and speed command signals and generating an error signal;

an LED controller on the motor for controlling the LED signaling means based on the error signal, wherein the LED controller is operative to adjust the LED signaling means in the positive or negative torque sector to correct the speed of the rotating armature;

a magnetic position marker on the PC board of the rotating armature; and

a second stationary magnetic pickup means on the motor for detecting the position marker to determine the position of the armature coils and sending a position feedback signal to the controller for maintaining the set speed.

7. The system defined in claim 6, further comprising at least one magnetic position marker associated with each coil.

8. The system defined in claim 6, wherein the magnetic markers are mounted flat on the armature.

9. The system defined in claim 6, wherein the magnetic markers are mounted on the peripheries of the armature.

10. The system defined in claim 9, further comprising at least one magnetic position marker associated with each coil.