Variable speed motor apparatus and method for forming same from a split capacitor motor
AssigneeGas Research Institute
InventorNick Vrionis
Life of this patent
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Abstract
The present invention is directed to the design of a low cost variable speed single phase AC induction motor by eliminating the capacitor, and running the motor as a two phase motor.
Claims10
A variable speed motor comprising:
- a split capacitor motor having a first terminal, a second terminal and a third terminal, a primary winding between the first and second terminals, an auxiliary winding between the second and third terminals, the split capacitor motor having its capacitor removed from between the first and third terminals;
- and
- means for driving the split capacitor motor in place of the capacitor across the first and third terminals as well as through the second terminal, the driving means providing a first frequency signal to the first terminal and a second frequency signal to the third terminal wherein the first and second frequency signals are both one of at least two possible frequencies and 90 degrees out-of-phase relative to the second terminal.
A method for forming a capacitor-less motor from a motor of the type having a rotor, a first terminal, a second terminal and a third terminal, a primary winding between the first and second terminals, an auxiliary winding between the second and third terminals, and a capacitor between the first and third terminals, the method comprising:
- removing the capacitor;
- and
- connecting a controller to the first, second and third terminals,
- the controller being constructed to drive the motor rotor by applying first and second frequency signals 90 degrees out-of-phase relative to one another to run the rotor at one predetermined speed.
A method for forming a variable speed motor from a motor of the type having a rotor, a first terminal, a second terminal and a third terminal, a primary winding between the first and second terminals, an auxiliary winding between the second and third terminals, and a capacitor between the first and third terminals, the method comprising:
- removing the capacitor;
- and
- connecting a controller to the first, second and third terminals,
- the controller being constructed to drive the motor rotor by applying first and second frequency signals 90 degrees out-of-phase relative to one another to run the rotor at one speed selected from two or more predetermined speeds over a complete range of speeds.
A method for running a motor at variable speeds, the method comprising:
- obtaining a motor of the type having a rotor, a first terminal, a second terminal and a third terminal, a primary winding between the first and second terminals, an auxiliary winding between the second and third terminals, and a capacitor between the first and third terminals;
- removing the capacitor;
- connecting a controller to the first, second and third terminals;
- and
- driving the rotor via the controller at one speed from two or more predetermined speeds over a complete range of speeds.
Dependencies are inferred from the claim text.