Integrated motor drive and recharge system
First Claim
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1. An electric motor drive and power processing system comprising:
- a first polyphase motor having windings in a wye configuration and a rotor with an output shaft, with a first neutral node in common with all the first motor windings;
a second polyphase motor having windings in a wye configuration and a rotor with an output shaft, with a second neutral node in common with all the second motor windings;
bidirectional dc power source means for providing and receiving electrical power to and from the first and second motors;
a first bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the first motor, connected between the bidirectional dc power source means and the windings of the first motor;
a second bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the second motor, connected between the bidirectional dc power source means and the windings of the second motor;
an input/output terminal connected to the first and second neutral nodes of the motors; and
control means, coupled to the first and second inverters, for operation in a drive mode and a recharge mode, for controlling the first and second inverters during the drive mode such that electrical power provided to the motors from the bidirectional dc power source means is converted to mechanical power produced at the first and second motor output shafts, and mechanical power from rotation of the first and second motor output shafts is converted to dc electrical power provided to the bidirectional dc power source means, and for controlling the first and second inverters during the recharge mode such that single-phase ac electrical power received at the input/output terminal is converted to dc power that is provided to the bidirectional dc power source means at a unity power factor conversion.
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Abstract
A drive and recharge system is disclosed that includes a bidirectional dc power source, two voltage-fed inverters, two induction motors, and a control unit. In the drive mode, power is bidirectionally connected between the dc power source and the motors. In the recharge mode, single-phase power applied to the neutral ports of the two motors is converted with unity power factor to return energy to the dc power source. An alternate scheme is also presented which uses a single motor having two sets of windings.
162 Citations
38 Claims
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1. An electric motor drive and power processing system comprising:
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a first polyphase motor having windings in a wye configuration and a rotor with an output shaft, with a first neutral node in common with all the first motor windings; a second polyphase motor having windings in a wye configuration and a rotor with an output shaft, with a second neutral node in common with all the second motor windings; bidirectional dc power source means for providing and receiving electrical power to and from the first and second motors; a first bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the first motor, connected between the bidirectional dc power source means and the windings of the first motor; a second bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the second motor, connected between the bidirectional dc power source means and the windings of the second motor; an input/output terminal connected to the first and second neutral nodes of the motors; and control means, coupled to the first and second inverters, for operation in a drive mode and a recharge mode, for controlling the first and second inverters during the drive mode such that electrical power provided to the motors from the bidirectional dc power source means is converted to mechanical power produced at the first and second motor output shafts, and mechanical power from rotation of the first and second motor output shafts is converted to dc electrical power provided to the bidirectional dc power source means, and for controlling the first and second inverters during the recharge mode such that single-phase ac electrical power received at the input/output terminal is converted to dc power that is provided to the bidirectional dc power source means at a unity power factor conversion. - 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. An electric motor drive and power processing control system comprising:
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a polyphase motor having windings in a wye configuration, defining a first set of windings and a second set of windings, further having a rotor with an output shaft, a first neutral node in common with all the first set of motor windings, and a second neutral node in common with all the second set of motor windings; bidirectional dc power source means for providing and receiving electrical power to and from the motor; a first bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the first set of windings, connected between the bidirectional dc power source means and the first set of windings; a second bidirectional, polyphase, voltage-fed, pulse-width-modulated inverter, having a phase multiplicity equal to that of the second set of windings, connected between the bidirectional dc power source means and the second set of windings; an input/output terminal connected to the first and second neutral nodes defining a common external connection port to the first and second neutral nodes; and control means, coupled to the first and second inverters, for operation in a drive mode and a recharge mode, for controlling the first and second inverters during the drive mode such that electrical power provided to the motor from the bidirectional dc power source means is converted to mechanical power produced at the motor output shaft, and mechanical power from rotation of the motor output shaft is converted to dc electrical power provided to the bidirectional dc power source means, and for controlling the first and second inverters during the recharge mode such that single-phase ac electrical power received at the input/output terminal is converted to dc power that is provided to the bidirectional dc power source means at a unity power factor conversion. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An electric motor drive and power processing control system comprising:
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a first polyphase motor having windings in a wye configuration with a first neutral node; a second polyphase motor having windings in a wye configuration with a second neutral node; bidirectional dc power source means for providing dc electrical power to the first and second motors and for receiving dc electrical power; a first polyphase, voltage-fed, pulse-width-modulated inverter having switching elements for controlling the flow of electrical power between the dc power source means to the windings of the first motor; a second polyphase, voltage-fed, pulse-width-modulated inverter having switching elements for controlling the flow of electrical power between the dc power source means to the windings of the second motor; and an input/output terminal connecting the first and second neutral nodes; wherein the switching elements of the first and second inverters are switched such that single-phase ac electrical power applied at the input/output terminal is applied to the dc power source means in a unity power factor conversion, dc electrical power from the dc power source means is converted to single-phase electrical power delivered to the input/output terminal, dc electrical power at the input/output terminal is provided to the dc power source means, and dc electrical power from the dc power source means is converted to dc power delivered to the input/output terminal. - View Dependent Claims (33, 34, 35, 36, 37)
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38. An electric motor drive and power processing system that operates in a drive mode and in a recharge mode, comprising:
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a first polyphase motor having windings in a wye configuration with a first neutral node; a second polyphase motor having windings in a wye configuration with a second neutral node; bidirectional dc power source means for providing dc electrical power to the first and second motors and for receiving dc electrical power; a first polyphase, voltage-fed, pulse-width-modulated inverter having semiconductor switching elements for converting the electrical power from the dc power source means to electrical signals provided to the windings of the first motor; a second polyphase, voltage-fed, pulse-width-modulated inverter having semiconductor switching elements for converting the electrical power from the dc power source means to electrical signals provided to the windings of the second motor; a terminal connecting the first and second neutral nodes; and control means for controlling the switching elements of the first and second inverters such that single-phase ac electrical power applied at the terminal is converted to dc power delivered to the dc power source means in a unity power factor conversion, dc electrical power from the dc power source means is converted to single-phase ac electrical power delivered to the terminal, dc electrical power at the terminal is delivered to the dc power source means, and dc electrical power from the dc power source means is converted to dc power delivered to the terminal.
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Specification