Starting device and circuit for starting single phase motors
First Claim
1. An auxiliary starting circuit adapted to be connected by only two interchangeable wires to a permanent split capacitor motor having a start winding and a run winding, the auxiliary starting circuit comprising;
- an auxiliary start capacitor and normally closed contacts electrically connected in series,said auxiliary start capacitor and said normally closed contacts adapted to be placed electrically in parallel with the existing start and run windings when the motor is started,a control relay coil and a resistor electrically connected in series and said series connected control relay coil and said resistor electrically connected in parallel with said auxiliary start capacitor and said normally closed contacts for sensing a voltage rise in the start and run windings of the motor, wherebysaid control relay coil becomes energized upon detection of voltage representing full motor speed to open said normally closed contacts and disconnect the electrical connection between said auxiliary start capacitor and the start and run windings of the motor, andsaid control relay coil becomes de-energized upon detection of no voltage to close said normally closed contacts and reconnect said auxiliary start capacitor to allow the immediate re-application of electrical power to the common and run terminals of the motor for starting the motor through the auxiliary start circuit.
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Accused Products
Abstract
An auxiliary capacitance starting device is connected by only two wires to a permanent split capacitor motor. The device includes an auxiliary start capacitor and a control relay which has a set of normally closed contacts, a coil, and a resistor. The auxiliary start capacitor and the normally closed contacts are connected in series and the coil and resistor are connected in series and in parallel with the auxiliary start capacitor and contacts. The free ends of two non-polarized wire leads are interchangeably electrically connected to the start and run windings or the run capacitor of the motor to place the circuit in parallel with the start and run windings or the run capacitor such that the relay coil means becomes energized upon detection of voltage representing full motor speed to open the contacts and break the electrical connection between the auxiliary start capacitor and the start and run windings. The relay coil becomes de-energized upon detection of no voltage to close the contacts to allow the immediate re-application of electrical power to the common and run terminals of the motor. The components and circuitry are enclosed in a housing which may be mounted on a suitable surface in close proximity to the motor.
78 Citations
14 Claims
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1. An auxiliary starting circuit adapted to be connected by only two interchangeable wires to a permanent split capacitor motor having a start winding and a run winding, the auxiliary starting circuit comprising;
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an auxiliary start capacitor and normally closed contacts electrically connected in series, said auxiliary start capacitor and said normally closed contacts adapted to be placed electrically in parallel with the existing start and run windings when the motor is started, a control relay coil and a resistor electrically connected in series and said series connected control relay coil and said resistor electrically connected in parallel with said auxiliary start capacitor and said normally closed contacts for sensing a voltage rise in the start and run windings of the motor, whereby said control relay coil becomes energized upon detection of voltage representing full motor speed to open said normally closed contacts and disconnect the electrical connection between said auxiliary start capacitor and the start and run windings of the motor, and said control relay coil becomes de-energized upon detection of no voltage to close said normally closed contacts and reconnect said auxiliary start capacitor to allow the immediate re-application of electrical power to the common and run terminals of the motor for starting the motor through the auxiliary start circuit. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9)
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7. A method for starting a permanent split capacitor motor having a start winding and a run winding through an auxiliary starting circuit comprising the steps of;
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electrically connecting an auxiliary start capacitor and the normally closed contacts of a control relay in series, electrically connecting the coil of said control relay in series with a resistor and connecting said series connected coil and resistor in parallel with said series connected auxiliary start capacitor and normally closed contacts for sensing voltage, electrically connecting said series connected auxiliary start capacitor and normally closed contacts said series connected control relay coil and resistor in parallel with the start and run windings of the motor, and applying electrical power to the common and run terminals of the motor, whereby said control relay coil means becomes energized upon detection of voltage representing full motor speed to open said normally closed contacts and disconnect the electrical connection between said auxiliary start capacitor and the start and run windings, and said control relay coil becomes de-energized upon detection of no voltage to close said normally closed contacts and reconnect said auxiliary start capacitor to allow the immediate re-application of electrical power to the common and run terminals of the motor for starting the motor through the auxiliary start circuit.
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10. An auxiliary starting device adapted to be connected by only two interchangeable wires to a permanent split capacitor motor having a start winding and a run winding, the device comprising;
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an auxiliary start capacitor and relay means including a set of normally closed contacts, a control relay coil, and a resistor, said auxiliary start capacitor and said normally closed contacts electrically connected in series with one another, said control relay coil and said resistor electrically connected in series with one another and connected in parallel with said series connected auxiliary start capacitor and said normally closed contacts, one element of said normally closed contacts being connected to a first terminal, said auxiliary start capacitor being connected in series between another element of said normally closed contacts and a second terminal, and said series connected control relay coil and resistor being connected between said first terminal and said second terminal and coupled with said normally closed contacts to open said contacts upon a predetermined voltage representing full motor speed, a first non-polarized wire lead having one end connected to said first terminal and a second non-polarized wire lead having one end connected to said second terminal, and the free ends of said non-polarized wire leads adapted to be interchangeably electrically connected in parallel with the start and run windings of the motor, whereby said control relay coil becomes energized upon detection of voltage representing full motor speed to open said normally closed contacts and disconnect the electrical connection between said auxiliary start capacitor and the start and run windings, and said control relay coil becomes de-energized upon detection of no voltage to close said normally closed contacts and reconnect said auxiliary start capacitor to allow the immediate re-application of electrical power to the common and start terminals of the motor for starting the motor through the auxiliary start circuit. - View Dependent Claims (11, 12, 13, 14)
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Specification