Circuit for dissipating the potential induced in each phase winding of a cycloconverter operated motor upon termination of conduction therethrough

Claim 2

In a cycloconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anodecathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, and means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases.

Claim 3

In a cyclOconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a silicon controlled rectifier gate switch for producing a gate signal when conduction through each one of said phase winding of said motor is to be terminated, and means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases.

Claim 4

In a cyclOconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a silicon controlled rectifier gate switch for producing a gate signal when conduction through each one of said phase winding of said motor is to be terminated, and means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases.

Claim 5

In a cycloconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a first silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal when conduction in a first direction through the said phase winding of said motor to which it corresponds is to be terminated, means for applying said gate signal produced by said first silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which said first silicon controlled rectifier gate switch corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a first direction therethrough deCreases, a second silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal when conduction in a second opposite direction through the said phase winding of said motor to which it corresponds is to be terminated, and means for applying said gate signal produced by said second silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a second opposite direction therethrough decreases.

Claim 6

In a cycloconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a first silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal when conduction in a first direction through the said phase winding of said motor to which it corresponds is to be terminated, means for applying said gate signal produced by said first silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which said first silicon controlled rectifier gate switch corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a first direction therethrough deCreases, a second silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal when conduction in a second opposite direction through the said phase winding of said motor to which it corresponds is to be terminated, and means for applying said gate signal produced by said second silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a second opposite direction therethrough decreases.

Claim 7

In a cycloconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a first silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal in response to each termination of the gate signal produced by any one of the said cycloconverter silicon controlled rectifier gate switches corresponding to the said cycloconverter silicon controlled rectifiers which complete an energizing circuit in a first direction through the said phase winding of said motor to which it corresponds, means for applying said gate signal produced by said first silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a first direction therethrough decreases, a second silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal in response to each termination of the gate signal produced by any one of the said cycloconverter silicon controlled rectifier gate switches corresponding to the said cycloconverter silicon controlled rectifiers which complete an energizing circuit in a second opposite direction through the said phase winding of said motor to which it corresponds, and means for applying said gate signal produced by said second silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a second opposite direction therethrough decreases.

Claim 8

In a cycloconverter system for cyclically energizing the phase windings of an alternating current induction motor from an alternating current supply potential source, a circuit for dissipating the potential induced in each phase winding of the motor upon the termination of conduction therethrough comprising in combination with a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a cycloconverter silicon controlled rectifier gate switch for producing a gate signal corresponding to each cycloconverter silicon controlled rectifier included in the network, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each said phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, a first silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal in response to each termination of the gate signal produced by any one of the said cycloconverter silicon controlled rectifier gate switches corresponding to the said cycloconverter silicon controlled rectifiers which complete an energizing circuit in a first direction through the said phase winding of said motor to which it corresponds, means for applying said gate signal produced by said first silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a first direction therethrough decreases, a second silicon controlled rectifier gate switch corresponding to each said phase winding of said motor for producing a gate signal in response to each termination of the gate signal produced by any one of the said cycloconverter silicon controlled rectifier gate switches corresponding to the said cycloconverter silicon controlled rectifiers which complete an energizing circuit in a second opposite direction through the said phase winding of said motor to which it corresponds, and means for applying said gate signal produced by said second silicon controlled rectifier gate switch across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor to which it corresponds which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow in a second opposite direction therethrough decreases.