CN1077351C - Rotation speed controlling circuit for AC motor - Google Patents
Rotation speed controlling circuit for AC motor Download PDFInfo
- Publication number
- CN1077351C CN1077351C CN 97120214 CN97120214A CN1077351C CN 1077351 C CN1077351 C CN 1077351C CN 97120214 CN97120214 CN 97120214 CN 97120214 A CN97120214 A CN 97120214A CN 1077351 C CN1077351 C CN 1077351C
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- motor
- drive circuit
- circuit
- reference voltage
- rotation speed
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- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The present invention relates to a rotary speed control circuit for an AC motor, which comprises a motor, a power supply, a driving circuit and a thyristor, wherein the motor is connected to two output pins of the driving circuit, the thyristor is connected between one end of the motor and the power supply, and the control electrode of the thyristor is connected to the driving signal output pin of the driving circuit; the feedback signal input pin of the driving circuit is connected with a rotary shaft encoder for detecting the rotary speed of the motor, and a variable resistor is arranged on the reference voltage input pin of the driving circuit and is used for regulating the reference voltage value of the reference voltage input pin. The rotary shaft encoder is an AC motor or an 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 be in order to regulate the reference voltage of drive circuit, alternating current motor is provided with a shaft encoder, detecting its rotational frequency, and feeds back 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 control of rotating speed is necessary, for the rotating speed that makes motor tends towards stability, utilizing servo circuit is comparatively ideal mode with the control motor speed, the control mode of current motor servo circuit can be divided into analog control mode and digital control approach, 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 complicated in the assembling process of circuit, cause production efficiency not high, therefore, 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 fed back on the drive circuit, be converted to voltage and with an adjustable reference voltage relatively after, drive and change the rotating speed of alternating current motor.
Concrete structure of the present invention is described below:
A kind of rotation speed controlling circuit for AC motor of the present invention comprises a motor and a power supply; Also comprise an one drive circuit and a controllable silicon; It is the integrated circuit of U209B that drive circuit adopts model; 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 feedback 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 the circuit diagram of rotation speed controlling circuit for AC motor embodiment of the present invention.
Rotation speed controlling circuit for AC motor 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, the integrated circuit that drive circuit 10 is U209 B by a model constitutes, drive circuit 10 has the frequency-voltage conversion function that can move conventional revolution speed control device 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 one end of motor 20 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 1O, 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 transfer to drive circuit 10 with the AC signal of a tool certain frequency, drive circuit 10 is converted to voltage signal with being about to this 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 be in order to regulate the reference voltage input value of drive circuit 10, when reference voltage level changes, the comparison output valve of drive circuit 10 inside will change simultaneously, and then adjust the rotating speed of control motor 20.
Can find out through above-mentioned explanation, but the function of physical circuit of the present invention mainly is balance and the rotating speed of adjusting motor 20, under the changeless situation of reference voltage, shaft encoder 12 will continue to detect the rotating speed of motor 2O, when load improves, when causing motor 20 rotating speeds to descend, shaft encoder 12 just feeds back to drive circuit 10 with 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 a drive circuit, it is a conventional rotating-speed control circuit, it has functions such as signal conversion, comparison, voltage stabilizing and amplification, be provided with a controllable silicon between one end of motor and power input again, its control utmost point connects the output connecting pin of drive circuit, can be driven triggering by the output signal of drive circuit, therefore, can cooperate the load state balance to keep the rotating speed of motor, and can simplify circuit greatly, make its equipped process easier, and can improve manufacturing efficient simultaneously.
Claims (3)
1. a rotation speed controlling circuit for AC motor comprises a motor and a power supply; It is characterized in that: also comprise an one drive circuit and a controllable silicon; It is the integrated circuit of U209B that drive circuit adopts model; 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 feedback 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 CN1216414A (en) | 1999-05-12 |
| CN1077351C true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013256926A (en) * | 2012-06-14 | 2013-12-26 | Saginomiya Seisakusho Inc | Drainage pump |
-
1997
- 1997-11-05 CN CN 97120214 patent/CN1077351C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1216414A (en) | 1999-05-12 |
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|---|---|---|---|
| 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 |