CN2378880Y - Control circuit for synchro motor - Google Patents
Control circuit for synchro motor Download PDFInfo
- Publication number
- CN2378880Y CN2378880Y CN99210575U CN99210575U CN2378880Y CN 2378880 Y CN2378880 Y CN 2378880Y CN 99210575 U CN99210575 U CN 99210575U CN 99210575 U CN99210575 U CN 99210575U CN 2378880 Y CN2378880 Y CN 2378880Y
- Authority
- CN
- China
- Prior art keywords
- motor
- circuit
- resistance
- speed
- controlling
- 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.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 abstract description 10
- 230000005284 excitation Effects 0.000 abstract description 8
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract 5
- 238000010891 electric arc Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The utility model relates to a controlling circuit for a synchronous device motor used in a steam wheel machine regulating system and improves the controlling technology of a traditional synchronous device. The controlling circuit for a synchronous device motor is composed of two resistances, two diodes and two switching apparatuses and solves the problems of stabilizing the speed, changing the speed, braking and extinguishing the arc needing to be solved in the process of controlling a single-phase series excitation type alternate and direct current two-purpose motor. The controlling circuit for a synchronous device motor effectively improves the controlling precision and the reliability of the work of controlling the circuit. The controlling circuit for a synchronous device motor is also suitable for other controlling equipment driven by a direct current series excitation type motor.
Description
The utility model relates to a kind of speed-changer motor control circuit that is applied to steam turbine control system, is applicable to the synchronizer control that is driven by single-phase series excitation type universal motor.
Homemade steam turbine control system, synchronizer extensively adopt a kind of series excitation type small power motor of AC/DC to drive, and adopt direct current supply.The load characteristic of this series excitation type motor is a software feature, is subjected to an interference that last mechanical load changes, and variation in a big way can take place the actual speed of motor.The uncertainty of motor speed brings very big difficulty for the automatic control of synchronizer, makes control precision be difficult to be guaranteed.In addition, when adopting the control of some flowing mode, because the high rotating speed of motor and the influence of machinery inertial, the idling time when making the motor outage is longer, also will influence control precision.Some present synchronizer controlling schemes are to adopt motor is carried out the part transformation or all more brings the raising control precision mostly, have so just significantly improved cost.
The utility model provides a kind of simple in structure, reliability is high, cost is low speed-changer motor control circuit, and this circuit has solved the speed stabilizing that Motor Control need solve, speed change, braking and extinguishing arc problem, thereby control precision is guaranteed easily.
The purpose of this utility model be achieved in that the speed-changer motor control circuit by just change/reversal switch device, current-limiting resistance, extinguishing arc diode form, by just changeing/steam turbine control system synchronizer that the control of reversal switch device is driven by single-phase series excitation type universal motor.Single-phase series excitation type universal motor externally has one just changeing end, reverse end and three binding posts of a common port.Forward and reverse switching device KT1 and KT2 respectively have two pairs of changeover contacts, Chang Kaiduan in their first pair of changeover contact all links to each other with power positive end, normal-closed end interconnects and is connected to an end of resistance R 1, end of convert links to each other with the backward rotation terminal with the forward rotation terminal of motor respectively, the other end of resistance R 1 links to each other with the public terminal of motor, resistance R 2 is serially connected between power supply negative terminal and the motor public terminal, thereby has constituted the main control loop that the speed-changer motor control circuit runs well.When this motor runs well (forward or reverse), main control loop is in parallel with armature with the inoperative magnetic field winding of motor, shunt field is superimposed upon on the series field, form the motor string thus and swash mode, make the hardening of motor load characteristic, can effectively suppress the underloading speed fling lifting, make stabilization of speed on reduced levels, inserted proper resistor R2 in the main control loop, inserted proper resistor R1 in the shunt field loop, all-in resistance R1+R2 has limited the shunt field electric current, the shunt field electric current is limited near the rated current, to prevent motor overheating.For armature circuit, resistance R 1 and R2 constitute a branch hydraulic circuit, regulate voltage ratio and can change armature voltage in a big way, thereby motor speed can be set on a large scale.Normal-closed end in second pair of changeover contact of forward and reverse switching device KT1 and KT2, on the normal-closed end in first pair of changeover contact that is connected to them, another is connected on the public terminal of motor, their end of convert interconnects, thereby has constituted the brake circuit of speed-changer motor control circuit.When motor cut off the power supply, second pair of changeover contact of KT1 and KT2 be three terminals short of motor, forms braking moment, reducing the idling time of armature, thereby realizes fast braking, guaranteed control precision.In addition, when the control contact disconnects, the electric arc that the motor winding inductance causes usually will be controlled contact burning, influence the reliability of control circuit, extinguishing arc diode D1 and D2 reversal connection are between the just commentaries on classics end and counter-rotating end and common port of motor in this circuit, constitute crowbar circuit, can reduce to control the electric arc of contact during outage, prevent arc short circuit.
This circuit is parallel on the armature by the inoperative field coil with motor, and the method for regulating resistance R 1 and R2 voltage ratio, realized the speed stabilizing and the speed change of motor, braking circuit has reduced the idling time of motor, and these measures are greatly improved the control precision of motor.Crowbar circuit has prevented arc short circuit, has protected the control contact, thereby has improved the security reliability of circuit.
Below in conjunction with the drawings and specific embodiments the utility model is further described:
The described circuit of Fig. 1 is the speed-changer motor control circuit is implemented control to single-phase series motor a schematic diagram.
The single-phase series excitation type motor that comprises a controlled AC/DC among Fig. 1, it has a forward rotation terminal 4, a backward rotation terminal 3 and a public terminal 2, also comprises two current-limiting resistance R1 and R2, two extinguishing arc diode D1 and D2 and forward and reverse switching device KT1 and KT2.
Forward and reverse switching device KT1 and KT2 respectively have two pairs of changeover contacts, their first pair of changeover contact KT1-1 all links to each other with power positive end with Chang Kaiduan among the KT2-1, normal-closed end interconnects and is connected to an end of resistance R 1, end of convert links to each other with backward rotation terminal 3 with the forward rotation terminal 4 of motor respectively, the other end of resistance R 1 links to each other with the public terminal of motor 2, resistance R 2 is serially connected between power supply negative terminal and the motor public terminal 2, thereby has constituted the main control loop that the speed-changer motor control circuit runs well.During this circuit working, motor rotor is incorporated a shunt field into, can make motor speed stable.Insert proper resistor R2 in the main control loop, insert proper resistor R1 in the shunt field loop, all-in resistance R1+R2 has limited the shunt field electric current, and the shunt field electric current is limited near the rated current.For armature circuit, resistance R 1 and R2 constitute a bleeder circuit, can set rotating speed on a large scale.
The second pair of changeover contact KT1-2 of forward and reverse switching device KT1 and KT2 and the normal-closed end among the KT2-2, on the first pair of changeover contact KT1-1 and the normal-closed end among the KT2-1 that one is connected to them, another is connected on the public terminal 2 of motor, their end of convert interconnects, thereby constituted the brake circuit of speed-changer motor control circuit, the coasting operation when being used to eliminate the motor outage.
Extinguishing arc diode D1 and D2 reversal connection constitute crowbar circuit between the just commentaries on classics terminal 4 and counter-rotating terminal 3 and public terminal 2 of motor.
The working condition of main control circuit is such (following all just to transfer example to): when positive turn-off closes device KT1 action, contact KT1-1 and power connection, KT1-2 disconnects, motor just changes, brake circuit disconnects, and this moment, contact KT2-1 and the KT2-2 of reversal switch device KT2 were closure state still, thereby the reversing magnetic field winding of having realized inoperative is in parallel with armature, make the motor drive mechanism bunchiness and swash mode, make motor speed become stable; Resistance R 2 strings are in major loop, and resistance R 1 string is in the winding loop of the magnetic field of inoperative, and all-in resistance R1+R2 remains unchanged, and defines the electric current in shunt field loop; Regulate the ratio of resistance R 1 and R2, promptly regulate the voltage at motor armature two ends, thereby reach the purpose of setting motor speed on a large scale.When the moment that motor has just started, electric current mainly flows through from the armature path, because the resistance R 2 of having connected in major loop, the electric current when making motor starting suitably reduces, thereby makes the motor smooth starting, helps the raising of control precision.
When the moment that the speed-changer motor control circuit disconnects, positive turn-off closes device KT1 and resets, be contact KT1-1 and KT1-2 closure, braking circuit is started working, make forward rotation terminal 4, backward rotation terminal 3 and the public terminal 2 mutual short circuits of motor, magnetic field temporarily keeps, and the electric current that back-emf produces makes armature produce braking moment, and motor is stopped rapidly.
The diode D1 and the D2 that are attempted by between forward rotation terminal 4, backward rotation terminal 3 and the public terminal 2 of motor play the extinguishing arc effect, in order to reduce outage moment forward or reverse switching device KT1 or the arcing of KT2 contact.
Claims (1)
1. speed-changer motor control circuit, by two resistance R 1 and R2, two diode D1 and D2, two switching device KT1 and KT2 form, it is characterized in that: switching device KT1 and KT2 respectively have two pairs of changeover contacts, wherein first pair of changeover contact KT1-1 links to each other with power positive end with Chang Kaiduan among the KT2-1, normal-closed end interconnects and is connected to an end of resistance R 1, end of convert links to each other with terminal [3] with the terminal [4] of motor respectively, the other end of resistance R 1 links to each other with the public terminal of motor [2], resistance R 2 is serially connected between the public terminal [2] of power supply negative terminal and motor, has constituted the main control loop of speed-changer motor control circuit; During motor operation, described main control loop is in parallel with armature with the inoperative magnetic field winding of motor, forms string and sharp mode; For armature circuit, resistance R 1 and resistance R 2 constitute a branch hydraulic circuit; Normal-closed end among second pair of changeover contact KT1-2 and the KT2-2 is connected respectively on first pair of normal-closed end and the public terminal [2] of motor in the changeover contact, and end of convert interconnects, and constitutes the brake circuit of speed-changer motor control circuit; When motor cut off the power supply, its brake circuit was with three terminals short of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99210575U CN2378880Y (en) | 1999-05-06 | 1999-05-06 | Control circuit for synchro motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99210575U CN2378880Y (en) | 1999-05-06 | 1999-05-06 | Control circuit for synchro motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2378880Y true CN2378880Y (en) | 2000-05-17 |
Family
ID=34003700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99210575U Expired - Fee Related CN2378880Y (en) | 1999-05-06 | 1999-05-06 | Control circuit for synchro motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2378880Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075140A (en) * | 2011-01-24 | 2011-05-25 | 上海海事大学 | Alternative-current/direct-current (AC/DC) dual-purpose motor control system |
-
1999
- 1999-05-06 CN CN99210575U patent/CN2378880Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075140A (en) * | 2011-01-24 | 2011-05-25 | 上海海事大学 | Alternative-current/direct-current (AC/DC) dual-purpose motor control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU4371893A (en) | Variable reluctance drive system | |
| CN108336941B (en) | Control circuit, control method, permanent magnet synchronous motor, compressor and storage medium | |
| CN1375924A (en) | Brushless motor driving apparatus | |
| CN101505128B (en) | Shift control method for multi-stage motor | |
| CN106849014A (en) | A kind of motor safety controls circuit system | |
| CN109510556B (en) | Forward and reverse rotation module of three-phase motor | |
| CN2378880Y (en) | Control circuit for synchro motor | |
| CN108400660A (en) | A kind of more magnetic pole two-phase switched reluctance machines of double-pole type and its power driving circuit | |
| CN203851071U (en) | Energy-saving control equipment system for dragging motor of oil pumping unit | |
| CN113266557B (en) | Active band-type brake system of polyester melt metering pump for chemical industry | |
| CN2620421Y (en) | High-efficient energy-saving synchronous motor of rare-earth permanent magnetic high-slip starting | |
| CN208128004U (en) | A kind of more magnetic pole two-phase switched reluctance machines of double-pole type and its power driving circuit | |
| CN108599668B (en) | Linear induction motor system of maglev train and control method thereof | |
| CN2577499Y (en) | Voltage-stabilizing permanent-magnetic generator | |
| CN207853789U (en) | Brushless feedback electric-machine directly-driven intelligence control system | |
| SU1226598A1 (en) | Method of braking induction motor | |
| CN111245310A (en) | Asynchronous starting permanent magnet synchronous motor quick starting method based on torque characteristics | |
| US3564362A (en) | Electric drive unit utilizing an m-g set as another drive unit when a certain speed is attained | |
| CN213342065U (en) | Motor rotating speed control circuit | |
| TWI747244B (en) | Method and system for controlling switches of a switched reluctance motor | |
| CN2295297Y (en) | Step-by-step motor controlled drive structure | |
| CN2636498Y (en) | Magnetic saturation type motor voltage regulating starter | |
| CN2153905Y (en) | Device for raising output power of wrapping electric motor | |
| CN207150468U (en) | A kind of high performance motor soft starter | |
| SU1030938A1 (en) | A.c. motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Zhenyu Document name: Notification of Termination of Patent Right |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |