Single-phase induction motor safety controller
First Claim
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1. An electronic control apparatus for automatically adjusting electrical input to a single phase alternating current (AC) induction motor running at constant RPM comprising:
- means for sampling voltage input provided by an electrical source to the motor, said means being connected to an input line from the electrical source;
means for rectifying the sample voltage input taken from the electrical source to yield a rectified output voltage;
means for creating a fixed pulse indicating zero voltage crossing;
means for sampling current input being provided by the electrical source to the motor to create a time-variable pulse indicating zero current crossing, said time-variable pulse which triggers a monostable output voltage; and
means for adjusting voltage supplied to the motor by using the fixed pulse and the monostable output voltage.
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Abstract
An electronic control apparatus to operate an alternating current induction motor protecting same from power line blackouts, brownouts and providing self-adjusting, linearized, non-stepped reduced voltage output coinciding to work load to enhance efficiency, thereby reducing electrical energy used by the motor. This apparatus can be utilized in conjunction with a refrigerator, air conditioner or almost any home appliance to yield a substantial savings in electrical use.
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Citations
20 Claims
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1. An electronic control apparatus for automatically adjusting electrical input to a single phase alternating current (AC) induction motor running at constant RPM comprising:
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means for sampling voltage input provided by an electrical source to the motor, said means being connected to an input line from the electrical source; means for rectifying the sample voltage input taken from the electrical source to yield a rectified output voltage; means for creating a fixed pulse indicating zero voltage crossing; means for sampling current input being provided by the electrical source to the motor to create a time-variable pulse indicating zero current crossing, said time-variable pulse which triggers a monostable output voltage; and means for adjusting voltage supplied to the motor by using the fixed pulse and the monostable output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of continuously monitoring the minimum voltage and current requirements of an AC motor and providing those requirements to the motor, using an electronic control apparatus comprising a means for sampling voltage input provided by an electrical source to the motor, said means being connected to an input line from the electrical source;
- a means for rectifying the sample voltage input taken from the electrical source to yield a rectified output voltage;
a means for creating a fixed pulse indicating zero voltage crossing;
a means for sampling current input being provided by the electrical source to the motor to create a time-variable pulse indicating zero current crossing, said time-variable pulse which triggers a fixed monostable output voltage; and
means for adjusting voltage supplied to the motor by using the fixed pulse indicating zero voltage crossing and the monostable output voltage, said method comprising the steps of;sampling both incoming voltage and current provided by an electrical source to the motor; determining by comparison to a preset reference voltage and current whether the incoming voltage and current are within limits for the motor; supplying said voltage and current to the motor if the incoming voltage and current are determined to be within limits; automatically continuously checking a load on the motor during its operation after the voltage and current are supplied; and automatically continuously resetting the voltage and current supplied to the motor according to the load on the motor during its operation.
- a means for rectifying the sample voltage input taken from the electrical source to yield a rectified output voltage;
Specification