Single-phase induction motor safety controller
AssigneeCondyne Technology, Inc.
InventorGary Heath
Life of this patent
Estimating the term…
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.
Claims20
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.
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.
Dependencies are inferred from the claim text.