Patent US3746959A successfully refreshed from Google Patents.
US3746959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for driving an electric pulse motor
Assignee: Fujitsu Ltd
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Filing: 1971-10-06
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Granted: 1973-07-17
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Expires: 1991-10-06
Abstract
Abstract The circuit for driving the electric pulse motor of the present application supplies a large amount of current to the exciting coil of the pulse motor when the rotor of the motor is in a step condition, and a small amount of current when in the stop condition. For this purpose, the circuit of the present invention provides a current detecting circuit in series with the exciting coil. By detecting the current flowing in said current detecting circuit when the rotor is in the step condition, a relatively wide voltage pulse is applied to the exciting coils, and in the stop condition a voltage pulse having a narrow width is applied to the exciting coil. Further improving the starting characteristics and the response characteristics of the pulse motor, the circuit of the present invention provides a spark killer circuit, that is, an integrating circuit which is composed of capacitors and resistors and diodes in parallel with the exciting coil.
Inventors
- 👤 K Kobayashi
- 👤 M Manabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:46
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/12; H02P8/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A circuit for driving a multiphase electric pulse motor having a plurality of exciting coils for said phases respectively coupled to a DC voltage source, comprising: driving circuits for each phase respectively coupled to said exciting coils, an exciting control circuit adapted to receive a command pulse train at its input, said exciting control circuit also having a plurality of output terminals connected respectively to said driving circuits, each of said driving circuits receiving an exciting control signal from said exciting control circuit and including means for chopping said DC voltage so as to alternately supply said DC voltage to said exciting coil and cut off said DC voltage therefrom during the time that said exciting control signal is applied to said driving circuit, said driving circuit also including means for establishing the period of the first supply of said DC voltage to said exciting coils to be longer than that of the subsequent supply of said DC voltage thereto.
Claim 2
Dependent Claim
160 words
A circuit for driving a multiphase electric pulse motor having a plurality of exciting coils for said phases respectively coupled to a DC voltage source, comprising: driving circuits for each phase respectively coupled to said exciting coils, an exciting control circuit adapted to receive a command pulse train at its input, said exciting control circuit also having a plurality of output terminals connected respectively to said driving circuits, each of said driving circuits receiving an exciting control signal from said exciting control circuit and including means for chopping said DC voltage so as to alternately supply said DC voltage to said exciting coil and cut off said DC voltage therefrom during the time that said exciting control signal is applied to said driving circuit, said driving circuit also including means for establishing the period of the first supply of said DC voltage to said exciting coils to be longer than that of the subsequent supply of said DC voltage thereto.
Claim 3
Dependent Claim
128 words
A circuit for driving a multiphase electric pulse motor having a plurality of exciting coils for said phases respectively coupled to a DC voltage source, comprising: driving circuits for each phase respectively coupled to said exciting coils, an exciting control circuit adapted to receive a command pulse train at its input, said exciting control circuit having a plurality of output terminals connected respectively to said driving circuits, each of said driving circuits receiving an exciting control signal from said exciting control circuit and including means responsive to said exciting control signal for producing during the step interval of said motor a first voltage pulse and for producing during the stop interval a selected number of pulses having a width substantially less than the width of said first pulse.
Claim 4
Dependent Claim
128 words
A circuit for driving a multiphase electric pulse motor having a plurality of exciting coils for said phases respectively coupled to a DC voltage source, comprising: driving circuits for each phase respectively coupled to said exciting coils, an exciting control circuit adapted to receive a command pulse train at its input, said exciting control circuit having a plurality of output terminals connected respectively to said driving circuits, each of said driving circuits receiving an exciting control signal from said exciting control circuit and including means responsive to said exciting control signal for producing during the step interval of said motor a first voltage pulse and for producing during the stop interval a selected number of pulses having a width substantially less than the width of said first pulse.
Claim 5
Dependent Claim
26 words
The circuit according to claim 7 wherein the amplitude of said first pulse and the amplitude of said selected number of pulses is substantially the same.
Claim 6
Dependent Claim
78 words
Circuit for driving an electric pulse motor according to claim 1, wherein said driving circuit comprises a switching circuit connected to said exciting coil, a current detecting circuit connected said switching circuit, said current detecting circuit providing non-linear characteristics so that detected values of the current in said current detecting circuit are of low value only in the initial stage of the excitation, and said switching circuit being switched by the detected values in said current detecting circuit.
Claim 7
Dependent Claim
67 words
Circuit for driving an electric pulse motor according to claim 1, wherein said driving circuit comprises a switching circuit connected to said exciting coil, a current detecting circuit connected to said switching circuit, a detected current controlling circuit controlling detected values in accordance with the initial state of said exciting control signal, and said switching circuit being switched by said detected values in said current detecting circuit.
Claim 8
Dependent Claim
65 words
Circuit for driving an electric pulse motor according to claim 5, wherein said driving circuit is further comprises a converter for converting the frequency of said exciting control signal into a voltage inversely proportional to said frequency and a control circuit controlling said detected values in said current detecting circuit using the output of said converter thereby controlling the mean value of said exciting current.
Claim 9
Dependent Claim
52 words
Circuit for driving an electric pulse motor according to claim 1, further comprising a spark killer circuit which is composed of an integrating circuit containing a resistor and a capacitor and a diode connected in series with said integrating circuit, said spark killer circuit being provided in parallel with said exciting coil.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |