Starting device for a single-phase induction motor
First Claim
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1. A single phase induction motor comprising:
- a motor coil;
a first auxiliary coil connected in parallel with the motor coil;
a capacitor connected in series with the first auxiliary coil; and
a starting device comprising a rectifier element, a resistance element, a second auxiliary coil inductively coupled to the first auxiliary coil, and a switch means for deactivating the rectifier element, wherein the rectifier element, the second auxiliary coil, the resistance element and the switch means are connected in series with each other and in parallel with the first auxiliary coil and the capacitor, and wherein the starting device acts in cooperation with the first auxiliary coil for providing a nonzero average flux within the motor coil during a start-up phase of the motor.
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Abstract
The single-phase induction motor has a starting device which is activated during the start-up phase of the motor and exposes at least a part of the motor coil to a voltage which changes temporarily, the average value of the voltage formed during one period of oscillation not being equal to zero.
134 Citations
4 Claims
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1. A single phase induction motor comprising:
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a motor coil; a first auxiliary coil connected in parallel with the motor coil; a capacitor connected in series with the first auxiliary coil; and a starting device comprising a rectifier element, a resistance element, a second auxiliary coil inductively coupled to the first auxiliary coil, and a switch means for deactivating the rectifier element, wherein the rectifier element, the second auxiliary coil, the resistance element and the switch means are connected in series with each other and in parallel with the first auxiliary coil and the capacitor, and wherein the starting device acts in cooperation with the first auxiliary coil for providing a nonzero average flux within the motor coil during a start-up phase of the motor. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeGrundfos A/S (Poul Due Jensens Fond)
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Original AssigneeGrundfos A/S (Poul Due Jensens Fond)
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InventorsDaugbjerg, J.o slashed.rgen, Jensen, Niels D.
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Primary Examiner(s)Cabeca, John W.
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Application NumberUS08/017,211Time in Patent Office1,446 DaysField of Search318/616, 318/787, 318/729, 318/781, 318/778, 318/785, 318/786, 318/254, 318/816, 318/817, 318/795, 318/793, 318/138, 318/784, 318/794, 323/210US Class Current318/794CPC Class CodesF04D 13/06 the pump being electrically...H02P 1/44 by phase-splitting with a c...
