Control arrangement for an induction motor compressor having at least three windings, a torque-augmentation circuit, a starting capacitor and a resistive element

A rotary induction machine with at least three windings, and with at least three winding terminals, a single-phase voltage between two power lines, a motor-starting CS capacitor, a positive-temperature-coefficient PTC thermistor, a motor-run capacitor with two electrical contacts, three motor windings connected in series, a first winding connected between a first winding terminal and a second winding terminal, a second winding connected between said first winding terminal and a third winding terminal, a third winding connected between said third winding terminal and a fourth winding terminal, means to connect one of said power lines to said first winding terminal, means to connect the other of said power lines to said fourth winding terminal, means to electrically connect said thermistor and said motor-starting capacitor into a series circuit with a first series end and a second series end, means to connect said first series end to said second winding terminal, means to connect said second series end to said third winding terminal, means to connect a motor-run capacitor first contact to one winding terminal, and means to connect one of the other winding terminals to the motor-run capacitor second contact.

A rotatable electrical a-c induction machine with three stator windings with three different phases, four winding terminals, a motor-starting capacitor, a positive-temperature-coefficient PTC thermistor, an alternating current single-phase power supply with two lines, a first motor winding connected between a first winding terminal and a second winding terminal, a second motor winding connected between the first and a third winding terminal, a third motor winding connected between the third winding terminal and a fourth winding terminal, a PTC thermistor connected between the first winding terminal and an intermediate terminal, the starting capacitor connected between the said intermediate terminal and the second winding terminal, a first supply line connected to the first winding terminal, and a second supply line connected to the fourth winding terminal.

A rotary induction machine with three windings of different phases, an electrical alternating single-phase supply, a sensor switch, means to control a power contactor responsive to said switch, means to energize said machine responsive to said contactor, a first positive-temperature-coefficient thermistor means to augment the machine currents during starting, a second positive-temperature-coefficient thermistor means responsive to the state of said machine, and means after the de-energization of said contactor to delay the re-energization of said contactor responsive to said second positive-temperature-coefficient thermistor.

A method for starting and running a three-phase compressor from a single-phase electrical power supply having first and second line terminals in which the apparatus includes a compressor having a rotatable shaft and an electrical motor having a rotatable shaft coupled to the rotatable shaft of the compressor, the motor having at least first, second and third motor windings of at least three phases, the method comprising supplying electrical power from the first and second line terminals of the single-phase power supply to the second and third windings of the motor and injecting a starting current into at least one of the windings to start the motor at high efficiency from the single-phase power supply.