Patent US3707660A successfully refreshed from Google Patents.
US3707660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for regulating the current supplied to the operative circuit of a commutating motor
Assignee: US Philips Corp
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Filing: 1970-03-03
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Granted: 1972-12-26
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Expires: 1990-03-03
Abstract
Abstract A control system for a commutating electric motor includes at least one semiconductor controlled element for controlling the current in the operative circuit of the motor and a control device for adjusting the firing angle thereof. A negative feedback regulating voltage is supplied to the control device which depends upon the current in the operative circuit and/or upon the motor speed. Switching transients in the operative circuit are limited by means of a sum voltage composed of a bias voltage and a positive feedback voltage derived in an integrating positive feedback loop. The positive feedback voltage is determined by the voltage across the operative circuit. The switching transients are primarily determined by the bias voltage and the resistance of the operative circuit.
Inventors
- 👤 Engbert Bernard Gerard Nijhof
- 👤 Wilhelmus Bernardus Rosink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:11
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
204 words
A motor control system including an arrangement for regulating the current supplied to the operative circuit of a commutating electric motor comprising, at least one controlled element for controlling the current supplied to said operative circuit, a control device for controlling said element and designed so that the mean value of the voltage applied to the operative circuit of the motor is proportional to a control voltage applied to said device, and means for deriving said control voltage comprising, means for producing a selected bias voltage, means for producing a positive feedback voltage which is a mean voltage derived from a measuring voltage developed across the operative circuit of the motor, means for combining the bias voltage and the mean voltage to derive a sum voltage, means for producing a negative feedback regulating voltage selectively proportional to the current in the operative circuit and on the speed of the motor, said regulating voltage and said sum voltage together constitute said control voltage so that, with the rotor of the motor stationary and in the absence of the regulating voltage, the switch-on transient of the operative circuit current is determined by the value of the bias voltage and by the resistance of the operative circuit.
Claim 2
Dependent Claim
204 words
A motor control system including an arrangement for regulating the current supplied to the operative circuit of a commutating electric motor comprising, at least one controlled element for controlling the current supplied to said operative circuit, a control device for controlling said element and designed so that the mean value of the voltage applied to the operative circuit of the motor is proportional to a control voltage applied to said device, and means for deriving said control voltage comprising, means for producing a selected bias voltage, means for producing a positive feedback voltage which is a mean voltage derived from a measuring voltage developed across the operative circuit of the motor, means for combining the bias voltage and the mean voltage to derive a sum voltage, means for producing a negative feedback regulating voltage selectively proportional to the current in the operative circuit and on the speed of the motor, said regulating voltage and said sum voltage together constitute said control voltage so that, with the rotor of the motor stationary and in the absence of the regulating voltage, the switch-on transient of the operative circuit current is determined by the value of the bias voltage and by the resistance of the operative circuit.
Claim 3
Dependent Claim
23 words
An arrangement as claimed in claim 1, characterized in that the mean voltage is derived from the measuring voltage through an integrating network.
Claim 4
Dependent Claim
46 words
An arrangement as claimed in claim 2, wherein said regulating voltage producing means includes a feedback network through which a regulating voltage component provides a negative feedback and wherein the time constant of the integrating network is at least equal to that of said feedback network.
Claim 5
Dependent Claim
41 words
An arrangement as claimed in claim 1 wherein said means for producing a regulating voltage includes a negative feedback loop for deriving a component of the regulating voltage that is responsive to and increases with the current of the operative circuit.
Claim 6
Dependent Claim
70 words
An arrangement as claimed in claim 4, characterized in that said negative-feedback loop includes a voltage threshold device which is designed so that it produces an output voltage when its threshold is exceeded, and means responsive to said output voltage for limiting the value of the control voltage to a level determined by the value of the component of the regulating voltage which is derived from the operative circuit current.
Claim 7
Dependent Claim
27 words
An arrangement as claimed in claim 4 wherein a second component of the regulating voltage is derived from a voltage which is proportional to the rotor speed.
Claim 8
Dependent Claim
49 words
An arrangement as claimed in claim 5 further comprising a source of reference voltage which determines the rotor speed, and means for comparing the voltage proportional to the rotor speed with the reference voltage which determines the rotor speed thereby to derive said second component of the regulating voltage.
Claim 9
Dependent Claim
59 words
An arrangement as claimed in claim 5 further comprising a semicontrolled bridge rectifier circuit for supplying the current to the motor, and a rectifier connected in the arrangement so as to compare the sum voltage with the second component of the regulating voltage in a manner such that the control voltage is constituted by the smaller of these voltages.
Claim 10
Dependent Claim
127 words
An arrangement as claimed in claim 1 wherein a first component of the regulating voltage comprises a voltage which is derived from the operative-circuit current through a negative-feedback loop so that it increases therewith, means for deriving a second component of the regulating voltage that is proportional to the rotor speed, the negatIve-feedback loop being provided with a voltage threshold and being designed so that the value of the control voltage is limited by the value of that component of the regulating voltage which is derived from the operative-circuit current in a manner such that the control voltage is constituted by the smallest of the group of voltages comprising the sum voltage, the second component of the regulating voltage and the first component of the regulating voltage.
Claim 11
Dependent Claim
60 words
An arrangement as claimed in claim 5 further comprising, two fully controlled full-wave bridge rectifier circuits for supplying the current to the motor, and a resistor through which the second component of the regulating voltage is superimposed on the sum voltage so that the regulation of the current supplied to the operative circuit of the motor has an integrating nature.
Claim 12
Dependent Claim
95 words
An arrangement as claimed in claim 9 wherein the negative-feedback loop that derives the first component of the regulating voltage is provided with a voltage threshold and is designed so that the value of the control voltage is limited by the value of the first component of the regulating voltage, and means for combining said voltages in a manner such that the control voltage is constituted by the smaller of the sum voltage with the superimposed second component of the regulating voltage and the first component of the regulating voltage derived from the operative-circuit current.
Claim 13
Dependent Claim
37 words
An arrangement as claimed in claim 1 wherein the control device includes a transistor connected in the common collector configuration, and means for applying the sum voltage and the regulating voltage to the base of said transistor.
Claim 14
Dependent Claim
95 words
A control system for an electric motor comprising, means for producing a first negative feedback voltage that is dependent upon the motor current, means for deriving a bias voltage that determines the value of the motor current in the absence of said negative feedback voltage, means for deriving a positive feedback voltage which is dependent upon the motor voltage, and a control device responsive to said bias voltage and to said positive and negative feedback voltages for controlling the current supplied to the motor from a supply source as a composite function of said voltages.
Claim 15
Dependent Claim
95 words
A control system for an electric motor comprising, means for producing a first negative feedback voltage that is dependent upon the motor current, means for deriving a bias voltage that determines the value of the motor current in the absence of said negative feedback voltage, means for deriving a positive feedback voltage which is dependent upon the motor voltage, and a control device responsive to said bias voltage and to said positive and negative feedback voltages for controlling the current supplied to the motor from a supply source as a composite function of said voltages.
Claim 16
Dependent Claim
50 words
A control system as claimed in claim 13 further comprising means for producing a second negative feedback voltage that is dependent upon the motor speed and supplying a speed voltage signal to said control device for controlling the motor current as a further function of said second negative feedback voltage.
Claim 17
Dependent Claim
55 words
A control system as claimed in claim 14 wherein said first and second negative feedback producing means include first and second feedback networks, respectively, and wherein said positive feedback deriving means includes an integrating network with a time constant that is at least equal to the time constants of said first and second feedback networks.
Claim 18
Dependent Claim
39 words
A control system as claimed in claim 14 further comprising a source of reference voltage that determines the motor speed, and means for comparing said reference voltage with the second negative feedback voltage to derive said speed voltage signal.
Claim 19
Dependent Claim
41 words
A control system as claimed in claim 14 wherein said positive feedback deriving means includes an integrating network and further comprising first and second isolation diodes respectively connected between said first and second negative feedback producing means and said control device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |