CN1216414A - Rotation speed controlling circuit for AC motor - Google Patents
Rotation speed controlling circuit for AC motor Download PDFInfo
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- CN1216414A CN1216414A CN 97120214 CN97120214A CN1216414A CN 1216414 A CN1216414 A CN 1216414A CN 97120214 CN97120214 CN 97120214 CN 97120214 A CN97120214 A CN 97120214A CN 1216414 A CN1216414 A CN 1216414A
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- motor
- drive circuit
- circuit
- rotation speed
- reference voltage
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- Control Of Electric Motors In General (AREA)
Abstract
The rotation speed controlling circuit includes one AC motor and one power source as well as one driving circuit and one SCR. The motor is connected to two output connecting pins of the driving circuit; the SCR connected between the motor and the power source has its control pole connected to the driving signal output pin of the driving circuit; the driving circuit has one shaft encoder to detect the rotation speed of the motor connected to its feedback signal input pin and one variable resistor to regulate its reference voltage connected to its reference voltage input pin; and the shaft encoder is one AC generator or one optical coupler.
Description
The present invention relates to a kind of rotation speed controlling circuit for AC motor, it mainly is by the running of a controllable silicon with the control alternating current motor with one drive circuit, wherein the reference voltage input terminal of drive circuit is provided with a variable resistor, can use the reference voltage of regulating drive circuit, alternating current motor is provided with a shaft encoder, detecting its rotational frequency, and feedbacks to drive circuit, compare with the reference voltage of transporting on it again, and use the rotating speed of regulating alternating current motor.
Motor uses very general in general industry or each industry, in the process of utilization, the operations necessary process that is controlled to be of rotating speed, for the rotating speed that makes motor tends towards stability, utilizing servo circuit is comparatively ideal mode with the control motor speed, can be divided into analog control mode or digital control approach with current motor servo circuit, it is the revolution of setting motor with voltage that the two difference is in the former, the latter sets revolution by frequency, but it is all too complicated on the composed component of these motor rotational speed control apparatus, except that basic voltage or phase-comparison circuit, analog control mode still comprises voltage to frequency (F-V) transducer, reference voltage generating circuit etc., the composed component of digital control approach is then more complicated again, comprise reference oscillation circuit as its built-up circuit, the shaping frequency multiplier circuit, integrating circuit and comparison amplifying circuit etc., also more complicated in the assembling process of circuit, cause production efficiency not high, therefore with the real necessity that further improvement is arranged of existing motor speed control circuit.
Main purpose of the present invention is: provide a kind of circuit comparatively simple rotation speed controlling circuit for AC motor.
For achieving the above object, the present invention takes following scheme:
Rotation speed controlling circuit for AC motor of the present invention mainly is to drive the alternating current motor running with the output of one drive circuit through a controllable silicon, this alternating current motor is provided with a shaft encoder to detect its rotating speed, and the signal that it detected feedback to drive circuit, be converted to voltage and with an adjustable reference voltage relatively after, drive and change the rotating speed of alternating current motor.
The rotation speed controlling circuit for AC motor that the present invention is comprises a motor and a power supply; It is characterized in that: also comprise an one drive circuit and a controllable silicon; Motor is connected on two output connecting pins of drive circuit, controllable silicon is connected between motor one end and power supply, the silicon controlled control utmost point is connected to the driving signal output connecting pin of drive circuit, and the back coupling signal input pin of drive circuit is provided with a shaft encoder that detects motor speed; The reference voltage input pin of drive circuit is provided with the variable resistor of its reference voltage level of adjustment.
Described rotation speed controlling circuit for AC motor is characterized in that: described shaft encoder is an alternating current generator or an optical coupler.
Further specify architectural feature of the present invention below in conjunction with drawings and Examples.
Brief Description Of Drawings:
Fig. 1 is a circuit diagram of the present invention.
The line construction of preferred embodiment of the present invention, see also shown in Figure 1, it mainly is to drive an alternating current motor 20 runnings with one drive circuit 10, wherein drive circuit 10 is made of an integrated circuit that is numbered U209 B, can move the frequency-voltage conversion function of conventional revolution speed control device in the drive circuit 10 simultaneously, voltage ratio reaches other voltage stabilizings and signal enlarging function, it mainly is with pin 1,14 are connected to respectively on the motor 20, be provided with a control element between motor 20 1 ends and power input, it is a controllable silicon 11, the control utmost point of controllable silicon 11 is connected to the output connecting pin 4 of drive circuit 10, and driven triggering by the output signal of drive circuit 10, the input pin 7 of drive circuit 10 is provided with a shaft encoder 12 (can also AC generator or optical coupler replace), shaft encoder 12 mainly is connected with to motor 20, in order to detect the rotating speed of motor 20, after shaft encoder 12 records this rotating speed, to transport to drive circuit 10 with the signal of a frequency form, drive circuit 10 is converted to voltage signal with being about to this frenquency signal, and compare with the reference voltage of importing, keep its rotating speed to cooperate the load state balance.
Be respectively equipped with a variable resistor 13,14 between the input pin 10,13 of drive circuit 10 and power end, can use the reference voltage input value of regulating drive circuit 10, when reference voltage level changes, the comparison output valve of drive circuit 10 inside will definitely change simultaneously, and then adjusts the rotating speed of control motor 20.
Can find out particular circuit configurations of the present invention through above-mentioned explanation, and mainly be the balance and the adjustment of motor 20 rotating speeds with the function of this circuit design, under the changeless situation of reference voltage, shaft encoder 12 will continue to detect the rotating speed of motor 20, when the load raising causes motor 20 rotating speeds to descend, shaft encoder 12 is just sent drive circuit 10 back to the message that is about to detect, and will detect and compare with the reference voltage of fixing after signal is converted to voltage signal, can obtain higher voltage output this moment, the extremely original set point so that motor 20 rotating speeds go up, and reach poised state; When changing reference voltage, then motor 20 also will change its running speed, to reach the purpose of adjusting rotating speed.
The present invention has following effect:
From the above, because motor speed control circuit of the present invention adopts one drive circuit, it is one normal Rule rotating-speed control circuit, it has the functions such as signal conversion, comparison, voltage stabilizing and amplification, an end of motor with Be provided with again a controllable silicon between power input, its control utmost point connects the output connecting pin of drive circuit, can be by driving electricity The output signal on road is driven triggering, therefore, can cooperate the load state balance to keep the rotating speed of motor, And can greatly simplify circuit, make its equipped process easier, and can improve manufacturing efficient simultaneously.
Claims (3)
1 one kinds of rotation speed controlling circuit for AC motor comprise a motor and a power supply; It is characterized in that: also comprise an one drive circuit and a controllable silicon; Motor is connected on two output connecting pins of drive circuit, controllable silicon is connected between motor one end and power supply, the silicon controlled control utmost point is connected to the driving signal output connecting pin of drive circuit, and the back coupling signal input pin of drive circuit is provided with a shaft encoder that detects motor speed; The reference voltage input pin of drive circuit is provided with the variable resistor of its reference voltage level of adjustment.
2 rotation speed controlling circuit for AC motor according to claim 1 is characterized in that: described shaft encoder is an alternating current generator.
3 rotation speed controlling circuit for AC motor according to claim 1 is characterized in that: described shaft encoder is an optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120214 CN1077351C (en) | 1997-11-05 | 1997-11-05 | Rotation speed controlling circuit for AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120214 CN1077351C (en) | 1997-11-05 | 1997-11-05 | Rotation speed controlling circuit for AC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1216414A true CN1216414A (en) | 1999-05-12 |
| CN1077351C CN1077351C (en) | 2002-01-02 |
Family
ID=5175815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97120214 Expired - Fee Related CN1077351C (en) | 1997-11-05 | 1997-11-05 | Rotation speed controlling circuit for AC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1077351C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511292A (en) * | 2012-06-14 | 2014-01-15 | 株式会社鹭宫制作所 | Dewatering pump |
-
1997
- 1997-11-05 CN CN 97120214 patent/CN1077351C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511292A (en) * | 2012-06-14 | 2014-01-15 | 株式会社鹭宫制作所 | Dewatering pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1077351C (en) | 2002-01-02 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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 |