GB2231179A - Device for controlling and regulating a direct-current electric motor - Google Patents
Device for controlling and regulating a direct-current electric motor Download PDFInfo
- Publication number
- GB2231179A GB2231179A GB9006862A GB9006862A GB2231179A GB 2231179 A GB2231179 A GB 2231179A GB 9006862 A GB9006862 A GB 9006862A GB 9006862 A GB9006862 A GB 9006862A GB 2231179 A GB2231179 A GB 2231179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- direct
- regulating
- input
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000001105 regulatory effect Effects 0.000 title claims description 9
- 230000001276 controlling effect Effects 0.000 title claims description 8
- 238000004804 winding Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Direct Current Motors (AREA)
Description
1 DEVICE FOR CONTROLLING AND REGULATING A DIRECT-CURRENT ELECTRIC MOTOR 3
-1 X 1-7 el The present invention relates to a device for controlling and regulating a direct-current electric motor.
More specifically, the subject of the invention is a device including: a transistor whose collector-emitter path is intended to be connected in series with the armature winding of the motor, between the two poles of a direct-current voltage supply, a sensor adapted to provide a signal indicative of the current present in the collector-emitter path of the transistor, and a current-regulator circuit comprising an amplifier with a first input for a control signal, a second input connected to the current sensor, and an output connected to the transistor for regulating the current flowing in the collector-emitter path in dependence on the control signal and on the signal provided by the sensor.
Control and regulation devices of the aforesaid type are used, for example, for controlling the motors of electric fans in motor-vehicle airconditioning systems.
Irregular operation and, in particular, phenomena of instability and the establishment of high-frequency self -oscillations are often encountered in the control and regulation devices of the type indicated above produced up to now.
2 The object of the present invention is to provide a device of the type specified above which prevents the aforesaid problems.
This object is achieved according to the invention by means of a control and regulation device of the type specified above, the main characteristic of which lies in that fact that an integrating network is interposed between the second input and the output of the amplifier.
This solution involves a certain but acceptable reduction in the gain at high frequencies, whilst at low and very low frequencies, and particularly with a steady current, the gain remains very high.
Moreover, 'the solution according to the invention ensures extremely stable operation of the device even at high frequencies, actually eliminating the possibility of the establishment of self-oscillations.
One possible explanation of the origin of the problems of the prior-art devices and the effectiveness of the solution proposed may perhaps be the following.
The high-frequency instability and the establishment of self oscillations in the prior-art devices are perhaps due to the effect of stray capacitance between the terminals of the transistor, particularly between its base and its collector. The effect of this capacitance is to cause a rapid fall in gain at high frequencies with a "gradient" equal to or greater than 12dB per octave when the gain is approximately 1. According to the known Bode's criterion, this is the reason for the instability.
d 1 3 The integrating network introduced in the device according to the invention apparently prevents instability problems because it causes the insertion of a pole at the origin, that is, at a frequency f = 0, of the overall transfer characteristic of the device. This has the effect of reducing the gain at medium and high frequencies, but with a gradient of less than 12dB per octave with a unitary gain value, resulting in stable operation at these frequencies also.
One embodiment of the invention will now be more particularly described, purely by way of non-limiting example, with reference to the accompanying drawing which shows the circuit diagram of a device for controlling and regulating a direct-current electric motor according to the present invention.
With reference to the drawing, a direct-current electric motor, for example, the motor for driving an electric fan in an air-conditioning system, is indicated 1. The armature winding of the motor is arranged in series with the collector-emitter path of an npn-type transistor 2, between the two poles of a direct-current voltage supply 3 constituted, for example, by a battery.
A resistor 4 is situated between the emitter of the transistor 2 and earth and acts as a current sensor: in operation, the voltage across this resistor is substantially proportional to the current flowing in the armature winding of the motor 1.
An operational amplifier, indicated 5, has its non-inverting input 5a connected to the central contact of a voltage divider constituted by two resistors 6 and 4 7 between the output of a digital/analog converter 8 and earth. In a manner not shown, the digital/analog converter 8 receives digital signals from a micoprocessor for controlling the operation of the electric motor 1.
The output of the operational amplifier 5 is connected to the base of the transistor 2 through a protective diode 9.
A feedback resistor, indicated 10, is interposed between the emitter of the transistor 2 and the inverting input 5b of the amplifier 5.
According to the invention, a reactive integrating network is associated with the amplifier 5 and is constituted by a resistor 11 and a capacitor 12 connected in series between the inverting input 5b and the output of the amplifier.
In operation, the current flowing in the collector-emitter path of the transistor 2, and hence in the armature winding of the motor 1, is regulated in dependence on the amplitude of the analog signal applied to the input Sa of the amplifier 5 and on the signal applied to the inverting input 5b through the resistors 4 and 10, the latter signal being indicative of the current actually flowing in the armature winding of the motor.
The effect of the integrating circuit 11, 12 is substantially to introduce into the transfer characteristic of the entire circuit a pole at a frequency f = o, and a zero at a frequency f = 112pi.C.Rll, in which C is the capacitance of the 1 1 capacitor 12 and R 11 is the resistance of the resistor 11.
As stated above, the solution according to the invention ensures the absolute stability of the device, even at high frequencies.
Claims (4)
1. A device for controlling and regulating a direct-current electric motor, including a transistor whose collector-emitter path is intended to be connected in series with the armature winding of the motor, between the two poles of a direct-current voltage supply, a sensor adapted to provide a signal indicative of the current present in the collector- emitter path of the transistor, and a current-regulator circuit including an amplifier with a first input for a control signal, a second input connected to the current sensor, and an output connected to the transistor for regulating the current flowing in the collector-emitter path in dependence on the control signal and on the signal provided by the current sensor, in which an integrating network is interposed between the second input and the output of the amplifier.
2. A device according to Claim 1, in which the integrating circuit comprises a first resistor and a capacitor connected in series.
3. A device according to Claim 2, in which a second resistor is interposed between the current sensor and the second input of the amplifier.
4. A device for controlling and regulating a direct-current electric motor, substantially as herein described with reference to, and as shown in, the accompanying drawing.
1 Published 1990 atThe Patent office, State House, 6671 HigliHolborn. London WC1R4TP.Further copies maybe obtainedfrom. The Patent Mce. Sales Branch. St Mary Cray, Orpington, Kent BRS 3RD. Printed by Multiplex techniques ltd. St Mary Cray. Kent, Con. 1187
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT8967233A IT1232074B (en) | 1989-03-31 | 1989-03-31 | CONTROL AND ADJUSTMENT DEVICE FOR A DIRECT CURRENT ELECTRIC MOTOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9006862D0 GB9006862D0 (en) | 1990-05-23 |
| GB2231179A true GB2231179A (en) | 1990-11-07 |
Family
ID=11300706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9006862A Withdrawn GB2231179A (en) | 1989-03-31 | 1990-03-28 | Device for controlling and regulating a direct-current electric motor |
Country Status (6)
| Country | Link |
|---|---|
| DE (1) | DE4010022A1 (en) |
| ES (1) | ES2021242A6 (en) |
| FR (1) | FR2646030A1 (en) |
| GB (1) | GB2231179A (en) |
| IT (1) | IT1232074B (en) |
| SE (1) | SE9001165L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2267003A (en) * | 1992-05-12 | 1993-11-17 | Fuji Electric Co Ltd | Current-limiting cicuit and constant voltage source therefor; current regulator |
| CN108227806A (en) * | 2017-12-29 | 2018-06-29 | 三英精控（天津）仪器设备有限公司 | A kind of novel VI transformation output circuit |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4129086C1 (en) * | 1991-09-02 | 1992-10-22 | Gesellschaft Fuer Fahrzeugklimaregelung Mbh, 7141 Schwieberdingen, De | |
| FR2838891A1 (en) * | 2002-12-17 | 2003-10-24 | Siemens Vdo Automotive | Electronic circuit for controlling and limiting an electric current in a load subjected to a supply voltage |
| CN110985428B (en) * | 2019-12-14 | 2020-12-01 | 珠海格力电器股份有限公司 | Cooling fan drive circuit and cooking utensil |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1566081A (en) * | 1976-07-28 | 1980-04-30 | Sun Electric Corp | Regulated voltage source |
| GB1603469A (en) * | 1978-05-22 | 1981-11-25 | Flexdrive Instr Pty Ltd | Voltage regulating circuits |
| US4341990A (en) * | 1981-04-27 | 1982-07-27 | Motorola, Inc. | High frequency line ripple cancellation circuit |
| US4346342A (en) * | 1981-06-09 | 1982-08-24 | Rockwell International Corporation | Current limiting voltage regulator |
| US4587476A (en) * | 1983-09-29 | 1986-05-06 | The Boeing Company | High voltage temperature compensated foldback circuit |
| EP0240618A2 (en) * | 1986-04-07 | 1987-10-14 | Tektronix, Inc. | Power buffer circuit |
| GB2222011A (en) * | 1988-08-12 | 1990-02-21 | Radix Systems Ltd | Control of motor for tactile indicator at pedestrian road crossing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2338215B2 (en) * | 1973-07-27 | 1975-07-31 | Robert Bosch Gmbh, 7000 Stuttgart | Circuit arrangement for controlling |
-
1989
- 1989-03-31 IT IT8967233A patent/IT1232074B/en active
-
1990
- 1990-03-28 GB GB9006862A patent/GB2231179A/en not_active Withdrawn
- 1990-03-29 FR FR9004015A patent/FR2646030A1/en active Pending
- 1990-03-29 DE DE4010022A patent/DE4010022A1/en not_active Withdrawn
- 1990-03-30 ES ES9000914A patent/ES2021242A6/en not_active Expired - Lifetime
- 1990-03-30 SE SE9001165A patent/SE9001165L/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1566081A (en) * | 1976-07-28 | 1980-04-30 | Sun Electric Corp | Regulated voltage source |
| GB1603469A (en) * | 1978-05-22 | 1981-11-25 | Flexdrive Instr Pty Ltd | Voltage regulating circuits |
| US4341990A (en) * | 1981-04-27 | 1982-07-27 | Motorola, Inc. | High frequency line ripple cancellation circuit |
| US4346342A (en) * | 1981-06-09 | 1982-08-24 | Rockwell International Corporation | Current limiting voltage regulator |
| US4587476A (en) * | 1983-09-29 | 1986-05-06 | The Boeing Company | High voltage temperature compensated foldback circuit |
| EP0240618A2 (en) * | 1986-04-07 | 1987-10-14 | Tektronix, Inc. | Power buffer circuit |
| GB2222011A (en) * | 1988-08-12 | 1990-02-21 | Radix Systems Ltd | Control of motor for tactile indicator at pedestrian road crossing |
Non-Patent Citations (1)
| Title |
|---|
| IBM Technical Disclosure Bulletin vol 25 No 7b December 1982pages 3633 & 3634 see 41 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2267003A (en) * | 1992-05-12 | 1993-11-17 | Fuji Electric Co Ltd | Current-limiting cicuit and constant voltage source therefor; current regulator |
| US5422593A (en) * | 1992-05-12 | 1995-06-06 | Fuji Electric Co., Ltd. | Current-limiting circuit |
| GB2267003B (en) * | 1992-05-12 | 1995-12-13 | Fuji Electric Co Ltd | A current-limiting circuit |
| CN108227806A (en) * | 2017-12-29 | 2018-06-29 | 三英精控（天津）仪器设备有限公司 | A kind of novel VI transformation output circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1232074B (en) | 1992-01-23 |
| SE9001165D0 (en) | 1990-03-30 |
| FR2646030A1 (en) | 1990-10-19 |
| DE4010022A1 (en) | 1990-10-31 |
| ES2021242A6 (en) | 1991-10-16 |
| SE9001165L (en) | 1990-10-01 |
| GB9006862D0 (en) | 1990-05-23 |
| IT8967233A0 (en) | 1989-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |
