US3737745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheel slip control system
Assignee: General Electric Co
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Filing: 1971-12-16
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Granted: 1973-06-05
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Expires: 1991-12-16
Abstract
Abstract A wheel slip control system for electric traction motor drives using series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship and generally employed in connection with electrically driven vehicles such as electric locomotives and the like. The wheel slip control system comprises a wheel slippage detector in the form of a measuring bridge, tachometer or the like for detecting slippage of any one of a number of series type direct current traction motors employed in driving the vehicle and deriving an output indication of any slippage. An auxiliary source of direct current is connectable to the series connected field-armature circuit of the respective series type traction motors in parallel with and in addition to the normal direct current excitation connections to the traction motor. The polarity of connection of the auxiliary direct current source is such that the armature current of the traction motor is reduced upon the auxiliary direct current excitation being supplied with a consequent reduction in the tractive effort of the traction motor. The connection preferably is in aiding relation across the field winding of the traction motor in which event the auxiliary current is added to and aids the normal excitation current. The value of the auxiliary current is adjusted to maintain total field current of the series type motor at the same or higher value than it was prior to slippage. As a consequence the back EMF of the motor is increased due to the slippage thereby reducing the armature current and the tractive effort of the motor to correct the slippage. A wheel slip control circuit also is provided which is responsive to the wheel slippage detector and controls the connection of the auxiliary source of direct current to the field-armature circuit of the series type traction motor for achieving the desired reduction in tractive effort upon detection of a slippage condition.
Inventors
- 👤 R Chevaugeon
- 👤 R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:24
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
252 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of direct current to the field-armature circuit of the series type traction motor, and the auxiliary direct current source comprises rectifying means connected to the series connected field-armature circuit of the series type traction motor, a source of alternating current, and phase control circuit means connected to and supplying said rectifying means and supplied from said alternating current source, and said wheel slip control means comprising phase control gating circuit means responsive to the wheel slippage detecting means and controlling the operation of the phase control circuit means for controlling the supply of alternating current to the rectifying means.
Claim 2
Dependent Claim
252 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of direct current to the field-armature circuit of the series type traction motor, and the auxiliary direct current source comprises rectifying means connected to the series connected field-armature circuit of the series type traction motor, a source of alternating current, and phase control circuit means connected to and supplying said rectifying means and supplied from said alternating current source, and said wheel slip control means comprising phase control gating circuit means responsive to the wheel slippage detecting means and controlling the operation of the phase control circuit means for controlling the supply of alternating current to the rectifying means.
Claim 3
Dependent Claim
95 words
A wheel slip control system according to claim 1 wherein the phase control gating circuit means includes fast and slow responding circuit means responsive to normal armature current flow through the traction motor for normally maintaining the phase control circuit means in an off-condition, and responsive to a slippage condition for turning-on the phase control circuit means in a fast responding manner to thereby supply corrective current through the rectifying means to the field-armature circuit of the traction motor for quickly reducing the tractive effort of the traction motor in response to a slippage condition.
Claim 4
Dependent Claim
86 words
A wheel slip control system according to claim 2 wherein the wheel slippage detecting means comprises bridge measurement circuit means connected in circuit relationship with the field-armature circuit of the series type traction motor for detecting any unbalanced condition due to the occurrence of slippage and for deriving a turn-on electric signal that is supplied to the phase control gating means for maintaining the phase control circuit means in an on-condition for so long as slippage continues and the measurement bridge remains in an unbalanced state.
Claim 5
Dependent Claim
47 words
A wheel slip control system according to claim 3 wherein the auxiliary source of direct current is connected across the field winding of the traction motor with a polarity such that the auxiliary direct current adds to the normal excitation direct current supplied to the field winding.
Claim 6
Dependent Claim
80 words
A wheel slip control system according to claim 4 wherein there are a plurality of series type traction motors connected in series-parallel circuit relationship across a direct current excitation source with a set of at least two series type traction motors being connected in series circuit relationship in each parallel path and with the auxiliary source of direct current being connected in aiding relationship across the field windings of all the series connected series type traction motors in a set.
Claim 7
Dependent Claim
54 words
A wheel slip control system according to claim 4 wherein there are a plurality of series type traction motors connected in parallel circuit relationship across a direct current excitation source and with a respective auxiliary source of direct current being connected across the field windings of each of the series type traction motors, respectively.
Claim 8
Dependent Claim
86 words
A wheel slip control system according to claim 1 wherein the wheel slippage detecting means comprises bridge measurement circuit means connected in circuit relationship with the field-armature circuit of the series type traction motor for detecting any unbalance condition due to the occurrence of slippage and for deriving a turn-on electric signal that is supplied to the phase control gating means for maintaining the phase control circuit means in an on-condition for so long as slippage continues and the measurement bridge remains in an unbalanced state.
Claim 9
Dependent Claim
206 words
A wheel slip control system for electric tracton motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary DC source is connected to the series type traction motor field-armature circuit through thyristor devices of the silicon control rectifier type having gating means connected to and controlled by the output from the wheel slippage detecting means.
Claim 10
Dependent Claim
206 words
A wheel slip control system for electric tracton motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary DC source is connected to the series type traction motor field-armature circuit through thyristor devices of the silicon control rectifier type having gating means connected to and controlled by the output from the wheel slippage detecting means.
Claim 11
Dependent Claim
53 words
A wheel slip control system according to claim 8 wherein the auxiliary direct current source comprises rectifier circuit means connected across the field windings of the series type traction motor, and an auxiliary source of alternating current is connected to and supplies the rectifying circuit means under the control of the thyristor device.
Claim 12
Dependent Claim
227 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traCtion motor, the polarity of the axuiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of direct current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises a motor driven direct current generator having its armature circuit connnected through a unidirectional conducting device across the field winding of the series type direct current traction motor with the field winding of the motor driven direct current generator being connected to and controlled by the output from the wheel slip control means.
Claim 13
Dependent Claim
227 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traCtion motor, the polarity of the axuiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of direct current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises a motor driven direct current generator having its armature circuit connnected through a unidirectional conducting device across the field winding of the series type direct current traction motor with the field winding of the motor driven direct current generator being connected to and controlled by the output from the wheel slip control means.
Claim 14
Dependent Claim
233 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises rectifier bridge circuit means connected across the field winding of the series type traction motor and a motor driven alternator set with the armature winding of the motor driven alternator being connected to and supplying the rectifier bridge circuit means, the field winding of the motor driven alternator being connected to and controlled by the wheel slip control means.
Claim 15
Dependent Claim
233 words
A wheel slip control system for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises rectifier bridge circuit means connected across the field winding of the series type traction motor and a motor driven alternator set with the armature winding of the motor driven alternator being connected to and supplying the rectifier bridge circuit means, the field winding of the motor driven alternator being connected to and controlled by the wheel slip control means.
Claim 16
Dependent Claim
240 words
A wheel slip control systm for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises a battery, direct current voltage divider, and the like and direct current chopper circuit means connected to and supplied from the battery, direct current voltage divider and the like and having its output connected in aiding relation across the field winding of the series type direct current traction motor, said direct current chopper circuit means being connected to and controlled by the wheel slip control means.
Claim 17
Dependent Claim
240 words
A wheel slip control systm for electric traction motor drives employing series type direct current traction motors having the field and armature windings connected in series electrical circuit relationship, the improvement comprising wheel slippage detecting means for detecting slippage of a series type direct current traction motor and deriving an output indication of any slippage, an auxiliary source of direct current connectable to the series connected field-armature circuit of the series type traction motor in parallel with and in addition to the normal direct current excitation supply for the traction motor, the polarity of the auxiliary source of direct current being such that when added to the normal excitation direct current results in a reduction of the armature current with a consequent reduction in the tractive effort of the traction motor, and wheel slip control means responsive to the wheel slippage detecting means and coupled to control the output of the auxiliary source of circuit current to the field-armature circuit of the series type traction motor, and the auxiliary source of direct current comprises a battery, direct current voltage divider, and the like and direct current chopper circuit means connected to and supplied from the battery, direct current voltage divider and the like and having its output connected in aiding relation across the field winding of the series type direct current traction motor, said direct current chopper circuit means being connected to and controlled by the wheel slip control means.
References Cited (Backward Citations)
US3183422A
Cited
US3560816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |