Patent US3735220A successfully refreshed from Google Patents.
US3735220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for a d.c. motor
Assignee: Robert Bosch GmbH
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Filing: 1971-03-12
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Granted: 1973-05-22
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Expires: 1991-03-12
Abstract
Abstract The field and armature currents are for the shunt-wound vehicle motor and are controlled in dependence on signals representing the actual and desired operating states of the motor. A seriesconnection regulating stage is provided for giving the motor a series-connection characteristic during acceleration up to a predetermined nominal speed.
Inventors
- 👤 S Renner
- 👤 W Bayha
- 👤 A Burgholte
- 👤 H Schweizer
- 👤 R Wirtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:16
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/003; H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/14; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; H02P7/2985; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
230 words
A control circuit for operating a D.C. motor having an armature winding and a field winding, particularly for operating a D.C. mover serving as prime mover in an electric vehicle, comprising, in combination, a rechargeable energy supply; first means for varying the armature and field currents, including controllable armature-current varying means for varying the armature current by intermittently connecting said armature winding to said supply so as to provide intermittent energizing pulses to said armature winding, and also including controllable field-current varying means for varying the field current by applying to said field winding intermittent energizing pulses, said armature-current varying means and said field-current varying means being separately controllable; first determining means for determining the motor rpm error of said D.C. motor; first control means actuated by said first determining means for controlling said armAture current varying means in dependence on said motor rpm error so as to reduce said motor rpm error; second determining means for determining the braking current error of said D.C. motor; and second control means actuated by said second determining means for effecting flow of regenerative braking current from said armature winding into said supply by controlling in a higher range of said motor rpm said fieldcurrent varying means and in a lower range of said motor rpm said armature-current varying means in dependence upon said braking current error to reduce the braking current error.
Claim 2
Dependent Claim
230 words
A control circuit for operating a D.C. motor having an armature winding and a field winding, particularly for operating a D.C. mover serving as prime mover in an electric vehicle, comprising, in combination, a rechargeable energy supply; first means for varying the armature and field currents, including controllable armature-current varying means for varying the armature current by intermittently connecting said armature winding to said supply so as to provide intermittent energizing pulses to said armature winding, and also including controllable field-current varying means for varying the field current by applying to said field winding intermittent energizing pulses, said armature-current varying means and said field-current varying means being separately controllable; first determining means for determining the motor rpm error of said D.C. motor; first control means actuated by said first determining means for controlling said armAture current varying means in dependence on said motor rpm error so as to reduce said motor rpm error; second determining means for determining the braking current error of said D.C. motor; and second control means actuated by said second determining means for effecting flow of regenerative braking current from said armature winding into said supply by controlling in a higher range of said motor rpm said fieldcurrent varying means and in a lower range of said motor rpm said armature-current varying means in dependence upon said braking current error to reduce the braking current error.
Claim 3
Dependent Claim
60 words
A circuit as defined in claim 1, wherein said first determining means comprises first setting means for setting a commanded motor rpm and first transducer means for determining the actual motor rpm, and wherein said second determining means comprises second setting means for setting a commanded braking current and second armature current transducer means for determining the actual braking current.
Claim 4
Dependent Claim
82 words
A circuit as defined in claim 2, wherein said second means comprises a field current regulating circuit which includes a field current controller connected to said field-current varying means, said controller having at its input an adding stage, and means for applying to said adding stage a signal indicative of the field current magnitude, means for applying to said adding stage a signal indicative of the armature current error, and means connected to said adding stage for setting a maximum field current.
Claim 5
Dependent Claim
155 words
A control circuit as defined in claim 3, wherein the motor is of the shunt type, further comprising a series connection regulator connected to said adding stage; an additional adding stage connected to one input of said series connection regulator; a preset minimum field current generator connected to one input of said additional adding stage; an OR-gate having an output connected to another input of said additional adding stage and having two inputs one input of the OR-gate being connected to said second transducer means, and the other input of said OR-gate being connected to said first transducer means and a diode connected between said one input of said OR-gate and another input of said series connection regulator, whereby when the motor is stopped the field current is at a minimum value, the field current increasing in value with increasing armature current or with increasing motor rpm to simulate the characteristics of a series-wound motor.
Claim 6
Dependent Claim
119 words
A control circuit as defined in claim 3, said rechargeable supply being a battery; further comprising means connected to the battery for regulating the battery voltage; a desired braking current limiter having one input connected to said means for regulating the battery voltage and another input connected to said second setting means; an additional adding stage having a first input connected to the output of said desired braking current limiter; a field regulation stage having its output connected to a third input of said adding stage and having its input connected to the output of said additional adding stage, said second transducer means monitoring the armature current and being connected to a second input of said additional adding stage.
Claim 7
Dependent Claim
27 words
A control circuit as defined in claim 5, further comprising a diode connected between a third input of said additional adding stage and said first setting means.
Claim 8
Dependent Claim
95 words
A control circuit as defined in claim 2, said second means comprising an armature regulating circuit which includes an armature current controller having its output connected to said armature-current varying means and having two inputs; a first adding stage having one input connected to said first setting means, another input of said first adding stage being connected to said first transducer means; an rpm controller whose input is connected to the output of said first adding stage, the output of said rpm controller being connected to one of the inputs of said armature current controller.
Claim 9
Dependent Claim
100 words
A control circUit as defined in claim 7, said supply being a battery, further comprising means connected to the battery for monitoring the battery voltage; an armature current limiter having one input connected to said rpm controller and another input connected to said means for monitoring the battery voltage; a second adding stage having its output connected to said one input of said armature current controller, and having one input connected to said armature current limiter; and a diode connected to another input of said second adding stage and to said means for monitoring the current flowing through the armature.
Claim 10
Dependent Claim
107 words
A control circuit as defined in claim 7, said supply being a battery, further comprising means connected to the battery for regulating the battery voltage; a desired current braking limiter having one input connected to said means for regulating the battery voltage and another input connected to said second setting means; a second adding stage having one input connected to the output of said desired current braking limiter; a diode connected between said second transducer means and another input of said second adding stage; and a braking current controller connected between the output of said second adding stage and the other input of said armature current controller.
Claim 11
Dependent Claim
107 words
A control circuit as defined in claim 2, said supply comprising a battery, wherein said second means comprises means connected to the battery for monitoring the voltage thereof; an adding stage having one input thereof connected to the output of said voltage monitoring means; a preset maximum voltage signal generator connected to another input of said adding stage; and a battery voltage regulator having its input connected to the output of said adding stage; and means connected to the outputs of said voltage monitoring means and said voltage regulator for controlling the armature and field currents as a function of the monitored and the preset battery voltages.
Claim 12
Dependent Claim
88 words
A control circuit as defined in claim 2, further comprising a smoothing inductor connected to one terminal of the armature winding; said second transducer being connected between said smoothing inductor and the circuit ground; a diode connected to the other terminal of the armature winding; wherein said armature-current varying means includes a thyristor connected to said diode, and a drive switch normally open during breaking connected between the battery and said thyristor, whereby the latter controls the current delivered to the armature when said drive switch is closed.
Claim 13
Dependent Claim
96 words
A control circuit as defined in claim 11, further comprising a brake switch, normally closed during braking, and connected between the connecting point between said thyristor and said diode and the circuit ground; a switching coil connected to said other terminal of the armature; a braking diode connected to said switching coil; and an other braking diode connected to the first mentioned braking diode and the supply, said other braking diode being connected in parallel to said drive switch, whereby recharging of the supply can take place below nominal rpm by the switching of said thyristor.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |