CN202406086U - Motor rotation speed obtaining circuit and frequency converter - Google Patents
Motor rotation speed obtaining circuit and frequency converter Download PDFInfo
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- CN202406086U CN202406086U CN2011205081793U CN201120508179U CN202406086U CN 202406086 U CN202406086 U CN 202406086U CN 2011205081793 U CN2011205081793 U CN 2011205081793U CN 201120508179 U CN201120508179 U CN 201120508179U CN 202406086 U CN202406086 U CN 202406086U
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Abstract
The utility model belongs to the field of motor control and provides a motor rotation speed obtaining circuit and a frequency converter. According to the utility model, the motor rotation speed obtaining circuit comprising a high-resistance isolation unit, a first clamp unit, a second clamp unit, a voltage-reduction filter unit, a waveform adjusting unit and a current-limiting voltage-stabilization unit is adopted for performing partial-voltage isolation, clamp processing, voltage-reduction filter and waveform adjustment on any two-phase input alternating current in the three-phase input alternating current of a motor and then outputting a rectangular wave electric signal to a processer, and then the processer generates corresponding motor rotation speed data according to the rectangular wave electric signal, so that the rapid obtainment of the motor real-time rotation speed is realized; and the motor rotation speed obtaining circuit has the advantages of high measuring precision and low circuit cost and solves the problems of low measuring precision, influence on the stability of the motor and low cost existing in the prior art.
Description
Technical field
The utility model belongs to Motor Control Field, relates in particular to a kind of motor speed acquisition cuicuit and frequency converter.
Background technology
At present, motor is widely used in the electromechanical automatic field, therefore usually need carry out rotating speed control to motor, and this just need use frequency converter.Before frequency converter drives motor, all need detect the actual speed of motor.
Prior art is through a plurality of position transducers that are connected with frequency converter are installed in motor motor speed to be detected; Yet; Use a plurality of position transducers can reduce the stability of motor, and since position transducer generally adopt response speed slow with the low Hall element of certainty of measurement, meeting and then influence certainty of measurement to motor speed; In addition, the price of position transducer is generally higher.Therefore, prior art exists certainty of measurement low, influences the stability and the high problem of cost of motor.
The utility model content
The purpose of the utility model is to provide a kind of motor speed acquisition cuicuit, and it is low to be intended to solve the existing in prior technology certainty of measurement, influences the stability and the high problem of cost of motor.
The utility model is achieved in that a kind of motor speed acquisition cuicuit, comprises microprocessor, and said motor speed acquisition cuicuit also comprises:
First input end inserts the input AC electricity mutually of any two in the motor three-phase input AC electricity respectively with second input, and said any two phase input AC electricity are carried out the high resistant isolated location that dividing potential drop is isolated;
Side joint is in first output of said high resistant isolated location, the alternating current of first output output of said high resistant isolated location carried out the first clamper unit of voltage clamp;
Side joint is in second output of said high resistant isolated location, the alternating current of second output output of said high resistant isolated location carried out the second clamper unit of voltage clamp;
First input end is connected with second output with first output of said high resistant isolated location respectively with second input, the alternating current through said first clamper unit and the said second clamper unit clamper processing is carried out the step-down filter unit of step-down and Filtering Processing;
Import the output of the said step-down filter unit of termination, the sinusoidal wave signal of telecommunication of said step-down filter unit output is adjusted into the waveform adjustment unit of the square wave signal of telecommunication;
The output of the said waveform adjustment unit of input termination, the test side of the said microprocessor of output termination, the current limliting voltage regulation unit that the square wave ac of said waveform adjustment unit output is carried out current limliting and voltage stabilizing processing.
Another purpose of the utility model also is to provide a kind of frequency converter that comprises said motor speed acquisition cuicuit.
In the utility model; The motor speed acquisition cuicuit that comprises said high resistant isolated location, the said first clamper unit, the said second clamper unit, said step-down filter unit, said waveform adjustment unit and said current limliting voltage regulation unit through employing; Any two phase input AC electricity in the motor three-phase input AC electricity are carried out extremely said microprocessor of dividing potential drop isolation, clamper processing, step-down filtering and the waveform adjustment back output one square wave signal of telecommunication; Generate the motor speed data of correspondence according to the frequency of the said square wave signal of telecommunication by said microprocessor; Thereby realized that to the obtaining fast of the real-time rotating speed of motor, certainty of measurement is high, and circuit cost is low; It is low to have solved the existing in prior technology certainty of measurement, influences the stability and the high problem of cost of motor.
Description of drawings
Fig. 1 shows the modular structure figure of the motor speed acquisition cuicuit that the utility model embodiment provides;
Fig. 2 shows the exemplary circuit figure of the motor speed acquisition cuicuit that the utility model embodiment provides.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the modular structure of the motor speed acquisition cuicuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
The motor speed acquisition cuicuit comprises microprocessor 700, and this motor speed acquisition cuicuit also comprises:
First input end inserts the input AC electricity (selecting V phase voltage and W phase voltage here) mutually of any two in the motor three-phase input AC electricity respectively with second input, and these any two phase input AC electricity are carried out the high resistant isolated location 100 that dividing potential drop is isolated.
Side joint is in first output of high resistant isolated location 100, the alternating current of first output output of high resistant isolated location 100 carried out the first clamper unit 200 of voltage clamp.
Side joint is in second output of high resistant isolated location 100, the alternating current of second output output of high resistant isolated location 100 carried out the second clamper unit 300 of voltage clamp.
First input end is connected with second output with first output of high resistant isolated location 100 respectively with second input, the alternating current through the first clamper unit 200 and the processing of the second clamper unit, 300 clampers is carried out the step-down filter unit 400 of step-down and Filtering Processing.
Import the output of termination step-down filter unit 400, the sinusoidal wave signal of telecommunication of step-down filter unit 400 outputs is adjusted into the waveform adjustment unit 500 of the square wave signal of telecommunication.
The output of input welding wave adjustment unit 500, the test side of output termination microprocessor 700, the current limliting voltage regulation unit 600 that the square wave ac of waveform adjustment unit 500 outputs is carried out current limliting and voltage stabilizing processing.
Fig. 2 shows the exemplary circuit structure of the motor speed acquisition cuicuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
As the utility model one embodiment, high resistant isolated location 100 comprises:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8 and capacitor C 1;
First end of resistance R 1 is the first input end of high resistant isolated location 100; First end of the second terminating resistor R2 of resistance R 1; Resistance R 3 is connected between first end of second end and resistance R 4 of resistance R 2, and second end of resistance R 4 is first output of high resistant isolated location 100, and first end of resistance R 5 is second input of high resistant isolated location 100; First end of the second terminating resistor R6 of resistance R 5; Resistance R 7 is connected between first end of second end and resistance R 8 of resistance R 6, and second end of resistance R 8 is second output of high resistant isolated location 100, and capacitor C 1 is connected between second end of second end and resistance R 8 of resistance R 4.
As the utility model one embodiment; The first clamper unit 200 comprises diode D1 and diode D2; The negative electrode of the anode of diode D1 and diode D2 all is connected with first output of high resistant isolated location 100; The negative electrode of diode D1 connects+the 15V DC power supply, and the anode of diode D2 connects-the 15V DC power supply.
As the utility model one embodiment; The second clamper unit 300 comprises diode D3 and diode D4; The negative electrode of the anode of diode D3 and diode D4 all is connected with second output of high resistant isolated location 100; The negative electrode of diode D3 connects+the 15V DC power supply, and the anode of diode D4 connects-the 15V DC power supply.
As the utility model one embodiment, step-down filter unit 400 comprises:
Operational amplifier U1, capacitor C 2, resistance R 9, resistance R 10, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 11, resistance R 12, resistance R 13 and capacitor C 6;
The inverting input of operational amplifier U1 and in-phase input end are respectively the first input end and second input of step-down filter unit 400; The positive power source terminal of operational amplifier and negative power end are connected with-15V DC power supply with+15V DC power supply respectively; Capacitor C 2 is connected between the inverting input and output of operational amplifier U1; The inverting input of the first termination operational amplifier U1 of resistance R 9; Resistance R 10 is connected between the output of second end and operational amplifier U1 of resistance R 9, and capacitor C 3 is connected between the positive power source terminal and ground of operational amplifier U1, and capacitor C 4 is connected between the negative power end and ground of operational amplifier U1; Capacitor C 5 is connected between the in-phase input end and ground of operational amplifier U1; Resistance R 11 is connected between first end of in-phase input end and resistance R 12 of operational amplifier U1, the second end ground connection of resistance R 12, the output of the first termination operational amplifier U1 of resistance R 13; Second end of resistance R 13 is the output of step-down filter unit 400, and capacitor C 6 is connected between second end and ground of resistance R 13.
As the utility model one embodiment, waveform adjustment unit 500 comprises:
Resistance R 14, operational amplifier U2, resistance R 15, resistance R 16 and resistance R 17;
First end of resistance R 14 is the input of waveform adjustment unit 500; The inverting input of the second termination operational amplifier U2 of resistance R 14; The in-phase input end of operational amplifier U2 is connected with first end of resistance R 15 and first end of resistance R 16 simultaneously; The second end ground connection of resistance R 15, resistance R 17 are connected between the output of second end and operational amplifier U2 of resistance R 16, and the output of operational amplifier U2 is the output of waveform adjustment unit 500.
As the utility model one embodiment; Current limliting voltage regulation unit 600 comprises resistance R 18, capacitor C 7 and voltage stabilizing didoe ZD1; First end of resistance R 18 and second end are respectively the input and the output of current limliting voltage regulation unit 600; First end of capacitor C 7 is connected the equal ground connection of anode of second end of capacitor C 7 and voltage stabilizing didoe ZD1 simultaneously with second end of resistance R 18 and the negative electrode of voltage stabilizing didoe ZD1.
Below in conjunction with operation principle the motor speed acquisition cuicuit is described further:
At first; First end of resistance R 1 and first end of resistance R 5 are introduced any two-phase alternating current (selecting V phase voltage and W phase voltage here) in the motor three-phase input AC electricity respectively; Respectively any two-phase alternating current (V phase voltage and W phase voltage) introduced carried out dividing potential drop isolation from branch road with by another road high-barrier that resistance R 5, resistance R 6, resistance R 7 and resistance R 8 constitute from branch road through the road high-barrier that constitutes by resistance R 1, resistance R 2, resistance R 3 and resistance R 4, and carry out exporting to after the Filtering Processing inverting input and the in-phase input end of operational amplifier U1 through capacitor C 1.The first clamper unit 200 that constitutes by diode D1 and diode the D2 then and respectively inverting input of operational amplifier U1 and the input AC electricity of in-phase input end are carried out voltage clamp by the second clamper unit 300 that diode D3 and diode D4 constitute; And the active power filtering electronic circuit that constitutes through the active power filtering electronic circuit that constitutes by capacitor C 2, resistance R 9 and resistance R 10 with by capacitor C 5, resistance R 11 and resistance R 12 to operational amplifier U1 inverting input and the input AC electricity of in-phase input end carry out Filtering Processing, thereby the stabilized input voltage that guarantees operational amplifier U1 is noiseless.
Because operational amplifier U1, resistance R 9 and resistance R 10 have also constituted feedback loop; Voltage that can the output AC of operational amplifier U1 is electric reduces (R1+R2+R3+R4)/(R11+R12) doubly; Thereby obtain the lower sinusoidal wave signal of telecommunication of voltage amplitude, to satisfy the need of work of subsequent conditioning circuit.Pass through the inverting input that resistance R 14 gets into operational amplifier U2 after the passive filtering electronic circuit filtering of the sinusoidal wave signal of telecommunication of operational amplifier U1 output through resistance R 13 and capacitor C 6 formations; Operational amplifier U2 should be adjusted into the square wave signal of telecommunication consistent with its voltage amplitude by the sine wave signal of telecommunication; Export this square wave signal of telecommunication to current limliting voltage regulation unit 600 then; The square wave signal of telecommunication that possesses certain amplitude that the back obtains microprocessor 700 required receptions is handled in voltage stabilizing through resistance R 18 current limlitings and voltage stabilizing didoe ZD1; Carry out frequency by 700 pairs of these square wave signals of telecommunication that possess certain amplitude of microprocessor at last and obtain the motor speed data that the back generates correspondence, thereby reach the purpose of obtaining motor speed.
Another purpose of the utility model embodiment also is to provide a kind of frequency converter that comprises above-mentioned motor speed acquisition cuicuit.
In the utility model embodiment; The motor speed acquisition cuicuit that comprises high resistant isolated location 100, the first clamper unit 200, the second clamper unit 300, step-down filter unit 400, waveform adjustment single 500 and current limliting voltage regulation unit 600 through employing; Any two phase input AC electricity in the motor three-phase input AC electricity are carried out extremely said microprocessor of dividing potential drop isolation, clamper processing, step-down filtering and the waveform adjustment back output one square wave signal of telecommunication; Generate the motor speed data of correspondence according to the frequency of the said square wave signal of telecommunication by microprocessor 700; Thereby realized that to the obtaining fast of the real-time rotating speed of motor, certainty of measurement is high, and circuit cost is low; It is low to have solved the existing in prior technology certainty of measurement, influences the stability and the high problem of cost of motor.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. a motor speed acquisition cuicuit comprises microprocessor, it is characterized in that, said motor speed acquisition cuicuit also comprises:
First input end inserts the input AC electricity mutually of any two in the motor three-phase input AC electricity respectively with second input, and said any two phase input AC electricity are carried out the high resistant isolated location that dividing potential drop is isolated;
Side joint is in first output of said high resistant isolated location, the alternating current of first output output of said high resistant isolated location carried out the first clamper unit of voltage clamp;
Side joint is in second output of said high resistant isolated location, the alternating current of second output output of said high resistant isolated location carried out the second clamper unit of voltage clamp;
First input end is connected with second output with first output of said high resistant isolated location respectively with second input, the alternating current through said first clamper unit and the said second clamper unit clamper processing is carried out the step-down filter unit of step-down and Filtering Processing;
Import the output of the said step-down filter unit of termination, the sinusoidal wave signal of telecommunication of said step-down filter unit output is adjusted into the waveform adjustment unit of the square wave signal of telecommunication;
The output of the said waveform adjustment unit of input termination, the test side of the said microprocessor of output termination, the current limliting voltage regulation unit that the square wave ac of said waveform adjustment unit output is carried out current limliting and voltage stabilizing processing.
2. motor speed acquisition cuicuit as claimed in claim 1 is characterized in that, said high-barrier comprises from the unit:
Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8 and capacitor C 1;
First end of said resistance R 1 is the first input end of said high resistant isolated location; First end of the said resistance R 2 of second termination of said resistance R 1; Said resistance R 3 is connected between first end of second end and said resistance R 4 of said resistance R 2; Second end of said resistance R 4 is first output of said high resistant isolated location; First end of said resistance R 5 is second input of said high resistant isolated location, first end of the said resistance R 6 of second termination of said resistance R 5, and said resistance R 7 is connected between first end of second end and said resistance R 8 of said resistance R 6; Second end of said resistance R 8 is second output of said high resistant isolated location, and said capacitor C 1 is connected between second end of second end and said resistance R 8 of said resistance R 4.
3. motor speed acquisition cuicuit as claimed in claim 1; It is characterized in that; The said first clamper unit comprises diode D1 and diode D2; The negative electrode of the anode of said diode D1 and said diode D2 all is connected with first output of said high resistant isolated location, and the negative electrode of said diode D1 connects+the 15V DC power supply, and the anode of said diode D2 connects-the 15V DC power supply.
4. motor speed acquisition cuicuit as claimed in claim 1; It is characterized in that; The said second clamper unit comprises diode D3 and diode D4; The negative electrode of the anode of said diode D3 and said diode D4 all is connected with second output of said high resistant isolated location, and the negative electrode of said diode D3 connects+the 15V DC power supply, and the anode of said diode D4 connects-the 15V DC power supply.
5. motor speed acquisition cuicuit as claimed in claim 1 is characterized in that, said step-down filter unit comprises:
Operational amplifier U1, capacitor C 2, resistance R 9, resistance R 10, capacitor C 3, capacitor C 4, capacitor C 5, resistance R 11, resistance R 12, resistance R 13 and capacitor C 6;
The inverting input of said operational amplifier U1 and in-phase input end are respectively the first input end and second input of said step-down filter unit 400; The positive power source terminal of said operational amplifier and negative power end are connected with-15V DC power supply with+15V DC power supply respectively; Said capacitor C 2 is connected between the inverting input and output of said operational amplifier U1; In fact the inverting input of the said operational amplifier U1 of first termination of resistance R 9; Said resistance R 10 is connected between the output of second end and said operational amplifier U1 of said resistance R 9; Said capacitor C 3 is connected between the positive power source terminal and ground of said operational amplifier U1; Said capacitor C 4 is connected between the negative power end and ground of said operational amplifier U1, and said capacitor C 5 is connected between the in-phase input end and ground of said operational amplifier U1, and said resistance R 11 is connected between first end of in-phase input end and said resistance R 12 of said operational amplifier U1; The second end ground connection of said resistance R 12; The output of the said operational amplifier U1 of first termination of said resistance R 13, second end of said resistance R 13 is the output of said step-down filter unit, said capacitor C 6 is connected between second end and ground of said resistance R 13.
6. motor speed acquisition cuicuit as claimed in claim 1 is characterized in that, said waveform adjustment unit comprises:
Resistance R 14, operational amplifier U2, resistance R 15, resistance R 16 and resistance R 17;
First end of said resistance R 14 is the input of said waveform adjustment unit; The inverting input of the said operational amplifier U2 of second termination of said resistance R 14; The in-phase input end of said operational amplifier U2 is connected with first end of said resistance R 15 and first end of said resistance R 16 simultaneously; The second end ground connection of said resistance R 15; Said resistance R 17 is connected between the output of second end and said operational amplifier U2 of said resistance R 16, and the output of said operational amplifier U2 is the output of said waveform adjustment unit.
7. motor speed acquisition cuicuit as claimed in claim 1; It is characterized in that; Said current limliting voltage regulation unit comprises resistance R 18, capacitor C 7 and voltage stabilizing didoe ZD1; First end of said resistance R 18 and second end are respectively the input and the output of said current limliting voltage regulation unit, and first end of said capacitor C 7 is connected the equal ground connection of anode of second end of said capacitor C 7 and said voltage stabilizing didoe ZD1 simultaneously with second end of said resistance R 18 and the negative electrode of said voltage stabilizing didoe ZD1.
8. a frequency converter is characterized in that, said frequency converter comprises like any described motor speed acquiring unit of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205081793U CN202406086U (en) | 2011-12-08 | 2011-12-08 | Motor rotation speed obtaining circuit and frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205081793U CN202406086U (en) | 2011-12-08 | 2011-12-08 | Motor rotation speed obtaining circuit and frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202406086U true CN202406086U (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205081793U Expired - Fee Related CN202406086U (en) | 2011-12-08 | 2011-12-08 | Motor rotation speed obtaining circuit and frequency converter |
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| Country | Link |
|---|---|
| CN (1) | CN202406086U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023425A (en) * | 2012-11-13 | 2013-04-03 | 安徽颐和新能源科技股份有限公司 | Idle speed measuring circuit of high-voltage inverter motor |
| CN107528521A (en) * | 2017-09-30 | 2017-12-29 | 天津科技大学 | Based on self-induction characteristic two-phase synchronous excitation switch reluctance motor control method and system |
-
2011
- 2011-12-08 CN CN2011205081793U patent/CN202406086U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023425A (en) * | 2012-11-13 | 2013-04-03 | 安徽颐和新能源科技股份有限公司 | Idle speed measuring circuit of high-voltage inverter motor |
| CN103023425B (en) * | 2012-11-13 | 2016-01-20 | 安徽颐和新能源科技股份有限公司 | High-pressure frequency-conversion motor idler revolutions measuring circuit |
| CN107528521A (en) * | 2017-09-30 | 2017-12-29 | 天津科技大学 | Based on self-induction characteristic two-phase synchronous excitation switch reluctance motor control method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20141208 |
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| EXPY | Termination of patent right or utility model |