CN2149722Y - Speed-adjustable ac motor - Google Patents
Speed-adjustable ac motor Download PDFInfo
- Publication number
- CN2149722Y CN2149722Y CN 92241820 CN92241820U CN2149722Y CN 2149722 Y CN2149722 Y CN 2149722Y CN 92241820 CN92241820 CN 92241820 CN 92241820 U CN92241820 U CN 92241820U CN 2149722 Y CN2149722 Y CN 2149722Y
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- motor
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- utility
- phase bridge
- rectifier
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Abstract
The utility model relates to a novel winding type AC electric motor adjusting device. The utility model is characterized in that the input end of a three-phase bridge type controlled silicon rectifier is used as the access end of the inductive electrical potential of a wound rotor of a motor, and the two output ends of the three-phase bridge type controlled silicon rectifier is connected with the both ends of a reactor; a follow-up trigger is connected with the control end of the three-phase bridge type controlled silicon rectifier; the utility model can control the variation of the angle of flow of the controlled silicon via regulating impulse phase shift bit to regulate the rotor current to achieve the speed regulation of the motor. The utility model has the advantages of raising the power factor, preventing the electric network from being polluted, reducing the cost, simplifying the structure, etc. The utility model is suitable for the speed regulation and the soft starting of the winding type AC electric motor.
Description
The utility model belongs to the ac motor speed control device, particularly relates to a kind of by regulating the device of wound type AC motor rotor current realization speed governing.
In the speed adjusting technique of existing wound type AC motor, controllable silicon string utmost point speed regulating device are used widely, but because its power factor is low, generally about 0.4, the inverter current of feedback electrical network contains the contaminative harmonic wave of suitable composition again, apparatus cost is higher in addition, so these technological deficiencies make it be restricted aspect higher economic benefit and the technical benefits realizing.
Chinese patent 87107830.9 " a kind of energy-conservation High Power Factor string utmost point speed regulating device " (open day: 89.1.25.), once at the inverter direct-flow side of controllable silicon string utmost point speed regulating device electronic switch in parallel, with it inverter voltage is carried out pulse-width modulation, so as to regulating rotating speed of motor.This scheme has obtained the raising power factor, with the part effect that reduces the harmonic current influence, but relates to the aforementioned inherent shortcoming of string utmost point speed governing, and still difficulty is all avoided, and particularly reducing aspect the apparatus cost, does not almost improve.
The purpose of this utility model is, overcome the major defect of above-mentioned existing string utmost point speed adjusting technique, designs a kind of simple in structurely, has the speed regulating device of the wound type AC motor of higher practical value.
New wound-rotor type ac motor speed control device of the present utility model, form by rectifier, reactor, it is characterized in that, rectifier is the three-phase bridge silicon controlled rectifier, its input is as the incoming end of the wound-rotor induction gesture of motor, and two outputs of three-phase bridge silicon controlled rectifier are connected with the two ends of reactor; Replace inverter and contravariant transformer by the servo-actuated trigger, the servo-actuated trigger connects with the control end of three-phase bridge silicon controlled rectifier.
Servo-actuated trigger described in the utility model is frequency, the amplitude according to the wound type AC motor rotor electromotive force, produces one group of trigger impulse.Form by synchronizer, comparator, saw-toothed wave generator and pulse shaping, itself and silicon controlled control end, potentiometer, reference voltage, earth terminal constitutes phase-control circuit.
During use, new wound-rotor type ac motor speed control device of the present utility model, insert induced electromotive force by the motor wound rotor, by regulating the trigger impulse phase place of servo-actuated trigger, angle of flow size to the three-phase bridge silicon controlled rectifier is controlled, and when thyristor operating angle was big, the electric current that motor rotor flows through was big, produce moment of accelerating, motor speed raises; Thyristor operating angle hour, the electric current that motor rotor flows through is little, and torque reduces, and motor speed reduces.When thyristor operating angle is zero when changing between standard-sized sheet is logical, motor speed turns round to the rated speed from zero.
The utlity model has following advantage, owing to adopted specific servo-actuated trigger technology that controllable silicon is carried out phase control, it is to rely on controllable silicon directly to regulate the motor rotor electric current to realize speed governing, thereby does not have the problem to electrical network feedback contaminative harmonic wave.Compare with the speed governing of the controllable silicon string utmost point, the utility model is no longer used parts such as the SCR inverter of price comparison costliness and contravariant transformer, has significantly to reduce cost and the effect of simplified structure.Be applicable to the speed governing and the soft start of wound type AC motor.
Below in conjunction with drawings and Examples, the utility model is further described.
Fig. 1 is the schematic diagram of new wound-rotor type ac motor speed control device.
Fig. 2 is the schematic diagram of servo-actuated trigger.
As seen from the figure, new wound-rotor type ac motor speed control device, form by rectifier, reactor, it is characterized in that, the input of three-phase bridge silicon controlled rectifier 1 is as the incoming end of wound rotor 2 induced potentials of motor, and two outputs of three-phase bridge silicon controlled rectifier are connected with the two ends of reactor 3; Connect by the control end of servo-actuated trigger 4 with the three-phase bridge silicon controlled rectifier.
The servo-actuated trigger is made up of synchronizer 9, comparator 10, saw-toothed wave generator 11 and pulse shaping 12, itself and silicon controlled control end 5, and potentiometer 6, reference voltage 7, earth terminal 8 constitutes phase-control circuits.
Claims (2)
1, a kind of new wound-rotor type ac motor speed control device, form by rectifier, reactor, it is characterized in that, rectifier is the three-phase bridge silicon controlled rectifier, its input is as the incoming end of the wound-rotor induction gesture of motor, and two outputs of three-phase bridge silicon controlled rectifier are connected with the two ends of reactor; Connect by the control end of servo-actuated trigger with the three-phase bridge silicon controlled rectifier; The servo-actuated trigger, with silicon controlled control end, potentiometer, reference voltage, earth terminal constitutes phase-control circuit.
2, new wound-rotor type ac motor speed control device as claimed in claim 1 is characterized in that the servo-actuated trigger is made up of synchronizer, comparator, saw-toothed wave generator and pulse shaping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92241820 CN2149722Y (en) | 1992-11-25 | 1992-11-25 | Speed-adjustable ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92241820 CN2149722Y (en) | 1992-11-25 | 1992-11-25 | Speed-adjustable ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2149722Y true CN2149722Y (en) | 1993-12-15 |
Family
ID=33781788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92241820 Expired - Fee Related CN2149722Y (en) | 1992-11-25 | 1992-11-25 | Speed-adjustable ac motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2149722Y (en) |
-
1992
- 1992-11-25 CN CN 92241820 patent/CN2149722Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |