US3732472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current supply and commutation circuit of electric motor
Assignee: GOLAY BUCHEL AND CIE
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Filing: 1970-06-15
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Granted: 1973-05-08
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Expires: 1990-06-15
Abstract
Abstract An electronic commutation circuit for a three phase electric motor is supplied with direct current by a circuit having a high internal non-ohmic impedance in relation to the impedance of the load. The supply circuit comprises an electronic interrupter, an inductance coil and a resistance in series with the motor commutation circuit. The supply circuit is opened when the current reaches a selected upper limit value and is closed when the current reaches a lower limit value thereby maintaining the current substantially constant. The limits may be made responsive to a motor function, for example speed or load. The switching of the commutating circuit is effected by transistors or thyristors under control of a cyclical impulse generator and distributor.
Inventors
- 👤 R Favre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/02; H02P23/00; H02P23/28; H02P6/00; H02P6/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
275 words
A current supply and commutation circuit of an electric motor having a plurality of phase windings comprising a motor commutating circuit and a current supply circuit, said commuting circuit comprising first and second bus lines of different potential, a pair of switching elements for each motor phase winding, one of said switching elements of each said pair connecting the respective motor winding with said first bus line and the other of said switching elements of each said pair connecting the respective motor winding with said second bus line, means controlling said switching elements to operate cyclically in predetermined sequence at a selected rate to connect one and only one said winding to said first bus line and to connect another and only one of said windings with said second bus line at any one time; said supply circuit having output terminals connected respectively with said bus lines and comprising a direct current power supply line, an electronic interrupter, an inductance coil and a resistor connected in series with said commutation circuit across said direct current power supply line; a diode connected in shunt across said series connected inductance coil, said motor commutating circuit and said resistor to provide a path of flow of current from said reactance coil through said motor commutating circuit when said interrupter is open and means sensing the current flowing through said resistor and controlling said interrupter to open said interrupter when said current increases to a selected upper limit and to close said interrupter when said current decreases to a selected lower limit, thereby maintaining said current substantially at a selected mean value irrespective of the impedance of said motor.
Claim 2
Dependent Claim
275 words
A current supply and commutation circuit of an electric motor having a plurality of phase windings comprising a motor commutating circuit and a current supply circuit, said commuting circuit comprising first and second bus lines of different potential, a pair of switching elements for each motor phase winding, one of said switching elements of each said pair connecting the respective motor winding with said first bus line and the other of said switching elements of each said pair connecting the respective motor winding with said second bus line, means controlling said switching elements to operate cyclically in predetermined sequence at a selected rate to connect one and only one said winding to said first bus line and to connect another and only one of said windings with said second bus line at any one time; said supply circuit having output terminals connected respectively with said bus lines and comprising a direct current power supply line, an electronic interrupter, an inductance coil and a resistor connected in series with said commutation circuit across said direct current power supply line; a diode connected in shunt across said series connected inductance coil, said motor commutating circuit and said resistor to provide a path of flow of current from said reactance coil through said motor commutating circuit when said interrupter is open and means sensing the current flowing through said resistor and controlling said interrupter to open said interrupter when said current increases to a selected upper limit and to close said interrupter when said current decreases to a selected lower limit, thereby maintaining said current substantially at a selected mean value irrespective of the impedance of said motor.
Claim 3
Dependent Claim
38 words
A circuit according to claim 1, in which said supply circuit comprises a plurality of transistors connected in cascade of which a first transistor constitutes a control transistor and the last transistor in said cascade constitutes said interrupter.
Claim 4
Dependent Claim
74 words
A circuit according to claim 2, in which said sensing and controlling means comprises a high frequency chopper, a transformer having a primary winding and a secondary winding, and a rectifier, said chopper and said primary winding being connected in series with one another across said resistor and said secondary winding and rectifier being connected in circuit with said first transistor to control the conduction of said first transistor and thereby control said interrupter.
Claim 5
Dependent Claim
27 words
A circuit according tO claim 2, comprising means for varying said upper and lower limits of said current at which said interrupter is opened and closed respectively.
Claim 6
Dependent Claim
25 words
A circuit according to claim 4, in which said current limit varying means comprises means for biasing said first transistor and for varying said bias.
Claim 7
Dependent Claim
109 words
A circuit according to claim 5, in which said biasing means biases said first transistor to conduction and in which said sensing and controlling means comprises a high frequency chopper, a transformer having a primary winding and a secondary winding and a rectifier, said chopper and said primary winding being connected in series with one another across said resistor, and said secondary winding and rectifier being connected in circuit with said first transistor so that the rectified output of said secondary winding opposes said bias to block said first transistor when the voltage drop across said resistor as sensed by said primary winding and chopper exceeds a selected value.
Claim 8
Dependent Claim
37 words
A circuit according to claim 5, in which said biasing means comprises a bias resistor in the base circuit of said first transistor and a bias regulating transistor controlling the flow of current through said bias resistor.
Claim 9
Dependent Claim
34 words
A circuit according to claim 4, in which said means for varying said upper and lower limits of said current comprises means for varying said limits as a function of operation of the motor.
Claim 10
Dependent Claim
33 words
A circuit according to claim 8, in which said current limit varying means comprises means for biasing said first transistor and for varying said bias as a function of operation of the motor.
Claim 11
Dependent Claim
55 words
A circuit according to claim 9, in which said biasing means comprises a bias resistor in the base circuit of said first transistor, a bias regulating transistor controlling the flow of current through said bias resistor and means responsive to a function of operation of the motor controlling the conduction of said bias regulating transistor.
Claim 12
Dependent Claim
21 words
A circuit according to claim 1, comprising a capacitor connected in shunt across said series connected motor commutation circuit and resistor.
Claim 13
Dependent Claim
179 words
A circuit according to claim 1, in which said supply circuit comprises a diode connected in shunt across said series connected inductance coil, motor commutation circuit and resistor, a plurality of transistors connected in cascade of which a first transistor constitutes a control transistor and the last transistor of said cascase constitutes said interrupter, a bias resistor in the base circuit of said first transistor, a bias regulating transistor controlling flow of current through said bias resistor to bias said first transistor to conduction; said sensing and controlling means comprising a high frequency chopper, a transformer having a primary winding and a secondary winding and a rectifier, said chopper and said primary winding being connected in series with one another across said first mentioned resistor and said secondary winding and rectifier being connected in the base circuit of said first transistor so that the rectified output of said secondary winding opposes said bias to block said first transistor when the voltage drop across said first mentioned resistor as sensed by said primary winding and chopper exceeds a selected value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |