US3769555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic control device in particular for use in a variable reluctance motor
Assignee: US Philips Corp
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Filing: 1972-02-04
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Granted: 1973-10-30
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Expires: 1992-02-04
Abstract
Abstract A control device for an electric motor with a stator having at least four groups of coils. Four switches are connected to the four coil groups so that two switches connect one terminal of a DC voltage supply to two coil groups and the other two switches connect the other terminal of the DC supply to the other two coil groups. A rotor position detector operates the first two switches in mutually exclusive time intervals at a frequency related to the rotor rotation. A pulse generator and two AND gates operate the other two switches in mutually exclusive time intervals at the frequency of the pulse generator. The frequency and the width of the pulse generator output pulses are variable.
Inventors
- 👤 R Dolbachian
- 👤 C Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:47
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02P; H02P6/00; H02P6/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
232 words
An electronic control device for an electric motor provided with a stator having at least four groups of coils and a rotor having at least four poles made of a magnetic material and comprising, a position detector having two outputs and arranged to detect the position of the rotor relative to the stator, a manual controller which cooperates with a pulse generator, a source of direct voltage for energizing said groups of coils, at least four electronic switches and at least two AND gates, two coil groups each being connected to an output of an electronic switch, the switches having first inputs connected to one terminal of said direct-voltage supply source and second inputs which are mutually inverted and are connected through a common amplifier to a first output of the position detector, the remaining two coil groups each being connected to an output of an electronic switch, the latter switches having first inputs which are connected to the other terminal of the direct-voltage supply source and second inputs which each are connected to the output of a respective one of said AND gates, the AND gates having first inputs which are mutually inverted with respect to one another and are connected through a second common amplifier to a second output of the position detector, and means connecting the second inputs of the AND gates to the output of the pulse generator.
Claim 2
Dependent Claim
232 words
An electronic control device for an electric motor provided with a stator having at least four groups of coils and a rotor having at least four poles made of a magnetic material and comprising, a position detector having two outputs and arranged to detect the position of the rotor relative to the stator, a manual controller which cooperates with a pulse generator, a source of direct voltage for energizing said groups of coils, at least four electronic switches and at least two AND gates, two coil groups each being connected to an output of an electronic switch, the switches having first inputs connected to one terminal of said direct-voltage supply source and second inputs which are mutually inverted and are connected through a common amplifier to a first output of the position detector, the remaining two coil groups each being connected to an output of an electronic switch, the latter switches having first inputs which are connected to the other terminal of the direct-voltage supply source and second inputs which each are connected to the output of a respective one of said AND gates, the AND gates having first inputs which are mutually inverted with respect to one another and are connected through a second common amplifier to a second output of the position detector, and means connecting the second inputs of the AND gates to the output of the pulse generator.
Claim 3
Dependent Claim
24 words
An electronic control device as claimed in claim 1, wherein the electronic switches each comprise at least two transistors connected in a Darlington configuration.
Claim 4
Dependent Claim
42 words
An electronic control device as claimed in claim 1 wherein the switches comprise power transistors, and a voltage-doubling circuit connected between one of the terminals of the direct-current supply source and one of the output electrodes of one of the power transistors.
Claim 5
Dependent Claim
36 words
An electronic control device as claimed in claim 3 further comprising two resistors, and means connecting the output of the voltage-doubling circuit to the control electrodes of two of the power transistors via said two resistors.
Claim 6
Dependent Claim
37 words
An electronic control device as claimed in claim 2, characterized in that the bases of the switching transistors of the Darlington configuration are each connected via a resistor to a centre tapping on the direct-current supply source.
Claim 7
Dependent Claim
177 words
A motor control circuit for a motor having four groups of stator coils and a rotor comprising, a source of DC supply voltage for the stator coils, means for detecting the rotor position to derive first and second out of phase control signals, four switching devices each with an output individually connected to an associated stator coil group, means connecting a first input terminal of each of a first pair of said switching devices to one terminal of the DC supply and a first input terminal of each of the second pair of switching devices to the other terminal of the DC supply, means responsive to said first control signal for switching said first pair of switching devices in mutually exclusive time intervals and at the frequency of said first control signal, a pulse generator, and means for combining the output pulses of the pulse generator with said second control signal to derive switching signals that switch the second pair of switching devices in mutually exclusive time intervals and at the frequency of the generator output pulses.
Claim 8
Dependent Claim
177 words
A motor control circuit for a motor having four groups of stator coils and a rotor comprising, a source of DC supply voltage for the stator coils, means for detecting the rotor position to derive first and second out of phase control signals, four switching devices each with an output individually connected to an associated stator coil group, means connecting a first input terminal of each of a first pair of said switching devices to one terminal of the DC supply and a first input terminal of each of the second pair of switching devices to the other terminal of the DC supply, means responsive to said first control signal for switching said first pair of switching devices in mutually exclusive time intervals and at the frequency of said first control signal, a pulse generator, and means for combining the output pulses of the pulse generator with said second control signal to derive switching signals that switch the second pair of switching devices in mutually exclusive time intervals and at the frequency of the generator output pulses.
Claim 9
Dependent Claim
23 words
A control circuit as claimed in claim 6 further comprising means for varying the width and the frequency of the generator output pulses.
Claim 10
Dependent Claim
103 words
A control circuit as claimed in claim 6 wherein said combining means comprise first and second And gates each having first and second input terminals and an output terminal individually connected to a second input terminal of the second pair of switching devices, means connecting a first input terminal of said first and second gates to the output of the pulse generator, and means for applying the second control signal to a second input of a first one of said And gates and an inverted replica of the second control signal to the second input of the second one of said And gates.
Claim 11
Dependent Claim
30 words
A control circuit as claimed in claim 6 further comprising means for varying the width and the frequency of the generator output pulses as a function of the motor load.
Claim 12
Dependent Claim
31 words
A control circuit as claimed in claim 6 further comprising a voltage doubler circuit connected between one terminal of the DC supply and an output of one of said switching devices.
Claim 13
Dependent Claim
35 words
A control circuit as claimed in claim 6 wherein rotation of the rotor causes the detecting means to derive first and second square wave control signals that are 90* out of phase with one another.
References Cited (Backward Citations)
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |