Noise suppression circuit for capacitor motors
First Claim
Patent Images
1. An alternating current motor having a stator core for operation from a source of alternating current power including in combination:
- a rotor for said motor;
a first winding with first and second ends;
a second winding with first and second ends;
first capacitor means with first and second terminals, the second end of said first winding connected in series circuit with said first terminal of said first capacitor means;
energy dissipation means connected across the first and second terminals of said first capacitor means;
a source of alternating current power;
first switch means connected between said source of power and said series connected first winding and first capacitor means for supplying power thereto when said first switch means is closed;
second switch means connecting said source of power with said second winding means when said second switch means is closed, whereupon with said first and second switch means closed, said series connected first winding and first capacitor means are connected in parallel with said first and second terminals of said second winding across said source of alternating current power;
means for causing said first and second switch means to be opened together and to be closed together, whereupon said first and second switch means are interconnected in such a manner that with said first and second switch means opened, said first capacitor means is prevented from discharging into either of said first and second windings.
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Abstract
A noise suppression circuit is provided for capacitor-start and capacitor-run alternating current motors. To prevent rotor chattering and noise from occurring upon disconnection of power from the motor, separate switches are used to connect alternating current power to the windings and to the capacitor; so that when power is disconnected, the capacitor is prevented from discharging into the motor windings. A power dissipation resistor is connected in parallel with the capacitor to permit the capacitor to discharge.
19 Citations
18 Claims
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1. An alternating current motor having a stator core for operation from a source of alternating current power including in combination:
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a rotor for said motor; a first winding with first and second ends; a second winding with first and second ends; first capacitor means with first and second terminals, the second end of said first winding connected in series circuit with said first terminal of said first capacitor means; energy dissipation means connected across the first and second terminals of said first capacitor means; a source of alternating current power; first switch means connected between said source of power and said series connected first winding and first capacitor means for supplying power thereto when said first switch means is closed; second switch means connecting said source of power with said second winding means when said second switch means is closed, whereupon with said first and second switch means closed, said series connected first winding and first capacitor means are connected in parallel with said first and second terminals of said second winding across said source of alternating current power; means for causing said first and second switch means to be opened together and to be closed together, whereupon said first and second switch means are interconnected in such a manner that with said first and second switch means opened, said first capacitor means is prevented from discharging into either of said first and second windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An alternating current motor having a stator core for operation from a source of alternating current power including in combination:
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a rotor for said motor; a first winding with first and second ends; a second winding with first and second ends; first capacitor means with first and second terminals, the second end of said first winding connected in series circuit with said first terminal of said first capacitor means; energy dissipation means connected across the first and second terminals of said capacitor means; a source of alternating current power having first and second terminals; and a three-pole single-throw switch comprising first, second and third stationary contacts and first, second and third corresponding moveable contacts, said first and second stationary contacts being interconnected to the first terminal of said source of power, and said first and second moveable contacts connected respectively to the second end of said second winding and the second terminal of said first capacitor means, said third fixed contact being connected to the second terminal of said power supply, and said third moveable contact being connected in common to the first terminals of said first and second windings.
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18. An alternating current motor having a stator core for operation from a source of alternating current power including in combination:
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a rotor for said motor; a first winding having first and second ends; a second winding having first and second ends; first capacitor means having first and second terminals, the second end of said first winding connected in series circuit with said first terminal of said first capacitor means; energy dissipation means connected across the first and second terminals of said first capacitor means; a source of alternating current power having first and second terminals; a single-throw switch having at least two poles with first and second stationary contacts and first and second moveable contacts, said first and second stationary contacts being interconnected to the first terminal of said power supply, and said first and second moveable contacts connected respectively in series circuits with said first and second windings so that when said first and second moveable contacts are disconnected from said first and second fixed contacts, said first capacitor means is prevented from discharging into either of said first and second windings; and means for connecting said second terminal of said power supply in electrical operating circuit with said second terminal of said capacitor means and said first and second windings.
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Specification