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US 2003/0206804 A1Published application
Apparatus and method for driving a three-phase compressor from a single-phase electrical power supply
OwnerOtto J.M. Smithinventor
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OwnerOtto J.M. Smithinventor
Estimating the term…
Apparatus for driving a three-phase compressor assembly from a single-phase electrical power supply having first and second power lines, said three-phase compressor assembly comprising a compressor having a rotatable shaft, an electrical motor having a rotatable shaft coupled to the rotatable shaft of the compressor, the electrical motor having at least first, second and third motor windings and having at least first, second and third terminals connected to the first, second and third windings, means adapted to connect the first and second power lines of the single-phase power supply to the first and second terminals and a torque augmentation circuit for injecting current into the third terminal and including a capacitor and an electrical component in series with the capacitor, said electrical component having resistive characteristics and having means for essentially interrupting the current being injected into the third terminal.
Apparatus for driving a three-phase compressor assembly from a single-phase electrical power supply having first and second power lines, said three-phase compressor assembly comprising a compressor for use with a gas source and for delivering compressed gas to a gas receiver and having a rotatable shaft, an electrical motor having a rotatable shaft coupled to the rotatable shaft of the compressor, the electrical motor having at least first, second and third motor windings and having at least first, second and third terminals connected to the first, second and third windings, means adapted to connect the first and second power lines of the single-phase power supply to the first and second terminals and a torque augmentation circuit for injecting current into the third terminal and including a capacitor and an electrical component in series with the capacitor, said electrical component having resistive characteristics and having means for essentially interrupting the current being injected into the third terminal.
A compressor with a rotatable shaft, an inlet suction port, an outlet pressure port, a gas source, a gas receiver, an electrical induction motor with at least three motor windings of different phases, each motor winding with a first and a second terminal, a single-phase electrical power supply, a static enabler means, a torque augmentation circuit, piping means to connect said gas source to said inlet suction port, piping means to connect said outlet pressure port to said gas receiver, shaft means to connect the said rotatable shaft to the shaft of the said induction motor, means to connect the single-phase power supply to the static enabler means, the torque augmentation circuit consisting of a starting capacitor in series with an electrical component with conductance or resistance, said series augmentation circuit having two starting terminals, connection means to connect a first starting terminal to one terminal of a first motor winding, means to connect a second starting terminal to one of the terminals of one of the other motor windings, a first terminal of the first winding is connected to the first supply line, means to connect the first terminal of the second motor winding through the said enabler to a line terminal and further means to connect said line terminal to a first line of said supply, and means to connect the first terminal of the third winding through the said enabler to the second line of the said supply.
A compressor with a rotatable shaft, an inlet suction port, an outlet pressure port, a gas source, a gas receiver, a motor run capacitor, an electrical induction motor with at least three motor windings of different phases, each motor winding having a first and a second terminal, piping means to connect said gas source to said inlet suction port, piping means to connect said outlet pressure port to said gas receiver, shaft means to connect the said rotatable shaft to the shaft of the said induction motor, a single-phase electrical power supply with two lines, a static enabler means, a torque augmentation circuit, means to connect the single-phase power supply to the static enabler means, the torque augmentation circuit consisting of a starting capacitor in series with an electrical component with conductance or resistance, said series augmentation circuit having two starting terminals, electrically-conductive connection means to connect a first starting terminal to one terminal of a first motor winding, means to connect a second starting terminal to one of the terminals of one of the other motor windings, means to connect the first terminal of the second motor winding through the said enabler to a line terminal and further means to connect said line terminal to a first line of said supply, circuit means to connect the first terminal of the third winding through the said enabler to the second line of the said supply, means to connect the second terminal of the first motor winding to the second terminal of the second motor winding and also to connect the second terminal of the first motor winding to the second terminal of the third motor winding, and a motor-run capacitor connected between the first terminal of the first motor winding and the first supply line.
A compressor with a rotatable shaft, an inlet suction port, an outlet pressure port, a gas source, a gas receiver, a single-phase electrical source with two supply lines, an electrical induction motor with three motor windings of different phases, the windings electrically connected in a closed delta configuration with three delta corner terminals, piping means to connect said gas source to the inlet suction port, piping means to connect the outlet pressure port to the gas receiver, the said rotatable shaft driven by the shaft of the induction motor, a single-phase first supply line connected through a switch to a power source terminal, said source electrically connected to a first delta corner, a second supply line connected to the second delta corner, a torque augmentation circuit with first and second starting terminals consisting of a starting capacitor in series with an electrical component with conductance or resistance, a first starting terminal connecting said electrical component to one pole of an electrically-conductive connection means, the other pole of said electrically-conductive connection means connected to the third delta corner terminal, a second starting terminal being the terminal of the said starting capacitor not connected to the said electrical component, means to connect said second starting terminal to the said power source, and a static enabler means containing a motor-run capacitor connected between the said power source and the third delta corner terminal.
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 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 motor winding connected between said first winding terminal and a third winding terminal, a third motor 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 the motor-run capacitor first contact to said second winding terminal, and means to connect one of the other winding terminals to the motor-run capacitor second contact.
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.
In 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.
Dependencies are inferred from the claim text.