CN202041577U - Current sampling circuit of servo motor - Google Patents

Current sampling circuit of servo motor Download PDF

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Publication number
CN202041577U
CN202041577U CN2011201445521U CN201120144552U CN202041577U CN 202041577 U CN202041577 U CN 202041577U CN 2011201445521 U CN2011201445521 U CN 2011201445521U CN 201120144552 U CN201120144552 U CN 201120144552U CN 202041577 U CN202041577 U CN 202041577U
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CN
China
Prior art keywords
sampled signal
circuit
sampling
output terminal
signal output
Prior art date
Application number
CN2011201445521U
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Chinese (zh)
Inventor
王献伟
Original Assignee
广州市韦德电气机械有限公司
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Priority to CN2011201445521U priority Critical patent/CN202041577U/en
Application granted granted Critical
Publication of CN202041577U publication Critical patent/CN202041577U/en

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Abstract

The utility model discloses a current sampling circuit of a servo motor, which comprises a first phase circuit, a second phase circuit and a third phase circuit, wherein the first phase circuit is provided with two first sampling resistors which are connected in parallel, the two ends of the two first sampling resistors which are connected in parallel are connected with a first analysis circuit, the second phase circuit is provided with two second sampling resistors which are connected in parallel, the two ends of the two second sampling circuits which are connected in parallel are connected with a second analysis circuit. The utility model can reduce the influence of temperature to the servo motor current sampling, and improves the control accuracy of the servo motor.

Description

The servomotor current sampling circuit

Technical field

The utility model relates to a kind of servomotor current sampling circuit.

Background technology

Servomotor is owing to its rotating speed can accurately control, in commercial unit, be widely used, and the rotating speed of servomotor control to be control by its input current realize, in existing servomotor current sampling circuit, be provided with sampling resistor, in the course of the work, sampling resistor very easily is subjected to Temperature Influence and produces the sampling drift, has influence on the control accuracy to the servomotor rotating speed, needs to do further to improve.

Summary of the invention

The purpose of this utility model is to overcome the defective of prior art, and a kind of servomotor current sampling circuit is provided, and the utility model can reduce the influence of temperature to the servomotor current sample, improves the control accuracy of servomotor.

Its technical scheme is as follows.

A kind of servomotor current sampling circuit comprises first circuitry phase, second circuitry phase and third phase circuit, is provided with two first sampling resistors that are in parallel on first circuitry phase, and the two ends of two first sampling resistors that are in parallel are connected with first analysis circuit; Be provided with two second sampling resistors that are in parallel on second circuitry phase, the two ends of two second sampling resistors that are in parallel are connected with second analysis circuit.

Below the further technical scheme of the utility model is described.

Described first analysis circuit includes the first sampled signal input end and the first sampled signal output terminal, is provided with the first electric isolated component between the first sampled signal input end and the first sampled signal output terminal; Described second analysis circuit includes the second sampled signal input end and the second sampled signal output terminal, is provided with the second electric isolated component between the second sampled signal input end and the second sampled signal output terminal; The first sampled signal output terminal is connected with the digital circuit converter with the second sampled signal output terminal simultaneously, and the digital circuit converter is connected with single-chip microcomputer.

The described first electric isolated component and the second electric isolated component are photoelectrical coupler.

Below advantage of the present utility model is described:

1, because the sampling resistor that each circuitry phase is provided with is two, in use, can reduce the drift that produces owing to temperature variation as much as possible, improve the current sample precision of servomotor, and then realize the precision control of servomotor speed;

2, in the servomotor course of work, current sampling signal is handled through the digital circuit converter earlier, and original analog signal is converted to digital signal, imports single-chip microcomputer again, reduced loss and the distortion of signal in transmission course, the precision that has improved the signal transmission and handled;

3, the first electric isolated component and the second electric isolated component all adopt photoelectrical coupler, have improved antijamming capability, have reduced cost.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model embodiment one described servomotor current sampling circuit;

Description of reference numerals:

1, first circuitry phase, 2, second circuitry phase, 3, the third phase circuit, 4, first sampling resistor, 5, first analysis circuit, 6, second sampling resistor, 7, second analysis circuit, 8, the first sampled signal input end, 9, the first sampled signal output terminal, 10, the first electric isolated component, 11, the second sampled signal input end, 12, the second sampled signal output terminal, 13, the second electric isolated component, 14, digital circuit converter, 15, single-chip microcomputer.

Embodiment

Below embodiment of the present utility model is elaborated.

As shown in Figure 1, a kind of servomotor current sampling circuit, comprise first circuitry phase 1, second circuitry phase 2 and third phase circuit 3, the two ends that are provided with first sampling resistor 4 that two 4, two of first sampling resistors that are in parallel are in parallel on first circuitry phase 1 are connected with first analysis circuit 5; The two ends that are provided with second sampling resistor 6 that two 6, two of second sampling resistors that are in parallel are in parallel on second circuitry phase 2 are connected with second analysis circuit 7.

Wherein, described first analysis circuit 5 includes the first sampled signal input end 8 and the first sampled signal output terminal 9, is provided with the first electric isolated component 10 between the first sampled signal input end 8 and the first sampled signal output terminal 9; Described second analysis circuit 7 includes the second sampled signal input end 11 and the second sampled signal output terminal 12, is provided with the second electric isolated component 13 between the second sampled signal input end 11 and the second sampled signal output terminal 12; The first sampled signal output terminal 9 is connected with digital circuit converter 14 with the second sampled signal output terminal 12 simultaneously, and digital circuit converter 14 is connected with single-chip microcomputer 15.The first electric isolated component 10 and the second electric isolated component 13 are photoelectrical coupler.

Present embodiment has following advantage:

1, because the sampling resistor that each circuitry phase is provided with is two, in use, can reduce the drift that produces owing to temperature variation as much as possible, improve the current sample precision of servomotor, and then realize the precision control of servomotor speed;

2, in the servomotor course of work, current sampling signal is handled through digital circuit converter 14 earlier, and original analog signal is converted to digital signal, imports single-chip microcomputer 15 again, reduced loss and the distortion of signal in transmission course, the precision that has improved the signal transmission and handled;

3, the first electric isolated component 10 and the second electric isolated component 13 all adopt photoelectrical coupler, have improved antijamming capability, have reduced cost.

Only be specific embodiment of the utility model below, do not limit protection domain of the present utility model with this; Any replacement and the improvement done on the basis of not violating the utility model design all belong to protection domain of the present utility model.

Claims (3)

1. servomotor current sampling circuit, it is characterized in that, comprise first circuitry phase, second circuitry phase and third phase circuit, be provided with two first sampling resistors that are in parallel on first circuitry phase, the two ends of two first sampling resistors that are in parallel are connected with first analysis circuit; Be provided with two second sampling resistors that are in parallel on second circuitry phase, the two ends of two second sampling resistors that are in parallel are connected with second analysis circuit.
2. servomotor current sampling circuit according to claim 1, it is characterized in that, described first analysis circuit includes the first sampled signal input end and the first sampled signal output terminal, is provided with the first electric isolated component between the first sampled signal input end and the first sampled signal output terminal; Described second analysis circuit includes the second sampled signal input end and the second sampled signal output terminal, is provided with the second electric isolated component between the second sampled signal input end and the second sampled signal output terminal; The first sampled signal output terminal is connected with the digital circuit converter with the second sampled signal output terminal simultaneously, and the digital circuit converter is connected with single-chip microcomputer.
3. as servomotor current sampling circuit as described in the claim 2, it is characterized in that the described first electric isolated component and the second electric isolated component are photoelectrical coupler.
CN2011201445521U 2011-05-09 2011-05-09 Current sampling circuit of servo motor CN202041577U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201445521U CN202041577U (en) 2011-05-09 2011-05-09 Current sampling circuit of servo motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201445521U CN202041577U (en) 2011-05-09 2011-05-09 Current sampling circuit of servo motor

Publications (1)

Publication Number Publication Date
CN202041577U true CN202041577U (en) 2011-11-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011201445521U CN202041577U (en) 2011-05-09 2011-05-09 Current sampling circuit of servo motor

Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901865A (en) * 2012-10-31 2013-01-30 北京经纬恒润科技有限公司 Motor phase current detection circuit
CN106559022A (en) * 2015-09-24 2017-04-05 上海电气集团股份有限公司 A kind of AC servo motor position control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901865A (en) * 2012-10-31 2013-01-30 北京经纬恒润科技有限公司 Motor phase current detection circuit
CN106559022A (en) * 2015-09-24 2017-04-05 上海电气集团股份有限公司 A kind of AC servo motor position control system
CN106559022B (en) * 2015-09-24 2018-12-25 上海电气集团股份有限公司 A kind of AC servo motor position control system

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111116

Termination date: 20120509