US3906317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for DC series-wound motor
Assignee: Hitachi Ltd
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Filing: 1974-04-09
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Granted: 1975-09-16
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Expires: 1994-04-09
Abstract
Abstract An apparatus for controlling the DC series-wound motor of an electric car or electric automobile by means of a thyristor chopper, characterized in that a commutating (auxiliary) thyristor of the thyristor chopper is connected in parallel with a field coil of the DC motor thereby to effect a field-weakening control of the motor.
Inventors
- 👤 Hiroshi Narita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/282; H02P3/00; H02P3/06; H02P3/08; H02P3/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
An apparatus for controlling a DC series-wound motor comprising DC power supply means coupled to said DC series-wound motor for supplying power thereto, a first thyristor connected in series with the armature and field coil of said DC series-wound motor, a second thyristor connected in parallel with said field coil of said DC series-wound motor and connected in series with said first thyristor in the same direction for commutating said first thyristor, commutator means for applying a voltage to said first and second thyristors and for turning off both thyristors when both of said thyristors are rendered conductive, the polarity of said voltage being reverse to the polarity of said thyristors, and control means for applying a phase controlled firing signal to both of said thyristors.
Claim 2
Independent Claim
126 words
An apparatus for controlling a DC series-wound motor comprising DC power supply means coupled to said DC series-wound motor for supplying power thereto, a first thyristor connected in series with the armature and field coil of said DC series-wound motor, a second thyristor connected in parallel with said field coil of said DC series-wound motor and connected in series with said first thyristor in the same direction for commutating said first thyristor, commutator means for applying a voltage to said first and second thyristors and for turning off both thyristors when both of said thyristors are rendered conductive, the polarity of said voltage being reverse to the polarity of said thyristors, and control means for applying a phase controlled firing signal to both of said thyristors.
Claim 3
Dependent Claim
37 words
An apparatus for controlling a DC series-wound motor according to claim 1, wherein said power supply means comprises a DC power supply connected to a series circuit of said armature, said field coil and said first thyristor.
Claim 4
Dependent Claim
47 words
An apparatus for controlling a DC series-wound motor according to claim 1, wherein said control means includes a chopper control device in which the frequency of the firing signal applied to said second thyristor is variable and the frequency signal is continuously applied to said first thyristor.
Claim 5
Dependent Claim
51 words
An apparatus for controlling a DC series-wound motor according to claim 1, further comprising a switching means for connecting to said DC power supply means, said series circuit consisting of said armature, said field coil and said first thyristor or said series circuit consisting of said armature and said field coil.
Claim 6
Dependent Claim
29 words
An apparatus for controlling a DC series-wound motor according to claim 1, further comprising a resistor inserted in a closed loop including said field coil and said second thyristor.
Claim 7
Dependent Claim
29 words
An apparatus for controlling a DC series-wound motor according to claim 1, further comprising a diode inserted in a closed loop including said field coil and said second thristor.
Claim 8
Dependent Claim
22 words
An apparatus for controlling a DC series-wound motor according to claim 1, further comprising a diode connected in parallel with said armature.
Claim 9
Dependent Claim
31 words
An apparatus for controlling a DC series-wound motor according to claim 1, further comprising a diode connected in parallel with a series circuit consisting of said armature and said field coil.
Claim 10
Independent Claim
184 words
An apparatus for controlling a DC series-wound motor having an armature and field winding connected in series, the field winding having first and second terminals, the first terminal being connected to the armature, the apparatus comprising DC power supply means coupled to the DC series-wound motor for supplying power thereto, a first thyristor having first and second terminals with the first terminal being coupled to the second terminal of the field winding, A second thyristor having first and second terminals, the second thyristor being coupled across the first and second terminals of the field winding and having the first terminal thereof coupled to the second terminal of the first thyristor so as to form a series connection with the first thyristor in the same direction for commutating the first thyristor, commutator means for applying a voltage to the first and second thyristors and for turning off both thyristors when both of the thyristors are rendered conductive, the polarity of the voltage being reversed to the polarity of the thyristors, and control means for applying a phase control firing signal to both of the thyristors.
Claim 11
Independent Claim
184 words
An apparatus for controlling a DC series-wound motor having an armature and field winding connected in series, the field winding having first and second terminals, the first terminal being connected to the armature, the apparatus comprising DC power supply means coupled to the DC series-wound motor for supplying power thereto, a first thyristor having first and second terminals with the first terminal being coupled to the second terminal of the field winding, A second thyristor having first and second terminals, the second thyristor being coupled across the first and second terminals of the field winding and having the first terminal thereof coupled to the second terminal of the first thyristor so as to form a series connection with the first thyristor in the same direction for commutating the first thyristor, commutator means for applying a voltage to the first and second thyristors and for turning off both thyristors when both of the thyristors are rendered conductive, the polarity of the voltage being reversed to the polarity of the thyristors, and control means for applying a phase control firing signal to both of the thyristors.
Claim 12
Dependent Claim
34 words
An apparatus for controlling a DC series-wound motor according to claim 9, wherein the commutator means are coupled to the second terminal of the first thyristor and the first terminal of the second thyristor.
Claim 13
Dependent Claim
40 words
An apparatus for controlling a DC series-wound motor according to claim 9, wherein the first terminals of the first and second thyristors are the anodes thereof and the second terminals of the first and second thyristors are the cathodes thereof.
Claim 14
Dependent Claim
42 words
An apparatus for controlling a DC series-wound motor according to claim 9, further comprising means for short-circuiting a circuit of the armature, the field coil and the first thyristor, the DC power supply means being connected to both terminals of the armature.
Claim 15
Dependent Claim
50 words
An apparatus for controlling a DC series-wound motor according to claim 9 further comprising means for short-circuiting a circuit of the armature, the field coil and the first thyristor, the DC power supply means being connected to both terminals of the series circuit of the armature and the field coil.
Claim 16
Dependent Claim
42 words
An apparatus for controlling a DC series-wound motor according to claim 9, further comprising means for short-circuiting a series circuit of the armature, the field coil and the first thyristor, and a braking resistor being connected to both terminals of the armature.
Claim 17
Dependent Claim
50 words
An apparatus for controlling a DC series-wound motor according to claim 9, further comprising means for short-circuiting a series circuit of the armature, the field coil and the first thyristor, and a braking resistor being connected to both terminals of a series circuit of the armature and the field 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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |