CN207557287U - A kind of brush direct current motor tachometer circuit - Google Patents
A kind of brush direct current motor tachometer circuit Download PDFInfo
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- CN207557287U CN207557287U CN201721298181.6U CN201721298181U CN207557287U CN 207557287 U CN207557287 U CN 207557287U CN 201721298181 U CN201721298181 U CN 201721298181U CN 207557287 U CN207557287 U CN 207557287U
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- resistance
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- direct current
- current motor
- tachometer circuit
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Abstract
The utility model discloses a kind of brush direct current motor tachometer circuit, including single chip circuit, liquid crystal display, key group, sample tachometer circuit, inductive electromagnetic tachometer circuit, brush direct current motor, sampling resistor R2, induction coil L1, wherein described sampling tachometer circuit carries out signal condition to the voltage pulse on sampling resistor R2 and obtains square wave, and the counter port T1 for feeding back to single chip circuit carries out counting processing acquisition motor speed, and show by liquid crystal display；Electromagnetic signal feeds back to inductive electromagnetic tachometer circuit and is improved to obtain pulse signal outside the brush direct current motor MOTO1 shells that the inductive electromagnetic tachometer circuit is sensed by induction coil L1, and the timer port T0 for being sent into single chip circuit carries out operation and obtains motor speed, is shown by liquid crystal display；Key group is made of button K1~K5, realizes the switching of measurement method.
Description
Technical field
The utility model is related to a kind of tachometer circuit more particularly to a kind of brush direct current motor tachometer circuits.
Background technology
Motor generally use speed measuring coder and tachometer generator test the speed.Speed measuring coder is expensive, shock resistance
Can force difference, when installation, needs transmission device, so as to which volume is big, installation and debugging are difficult.Tachometer generator is not easy to mend into trip temperature
It repays, cost is also higher, and there are commutators and brush, inevitably will appear electric spark, so there are interference phenomenon, brush is easily ground
Damage, needs to regularly replace, maintenance workload is big, and functional reliability is poor.
For this problem, by the mounting magnetic steel on machine shaft, the measurement of rotating speed of motor is realized by hall sensing,
It is small although this at low cost, external amplification and rectification circuit is needed using Hall sensor, due to hall sensing magnetic field
It is weaker, so cannot get apparent inductive signal, it is low so as to measure precision.
Utility model content
The purpose of the utility model is to overcome the defects of the prior art, providing a kind of brush direct current motor tachometer circuit,
Tachometric survey is carried out to brush direct current motor using contact and contactless two kinds of forms, it is not only small, it is at low cost, and
Measuring accuracy is high, and appearance and structure without changing motor, realizes and directly measures.
To achieve the above object, the utility model proposes following technical solutions：
A kind of brush direct current motor tachometer circuit, including single chip circuit, liquid crystal display, key group samples the electricity that tests the speed
Road, inductive electromagnetic tachometer circuit, brush direct current motor, sampling resistor R2, wherein induction coil L1, liquid crystal display are serially connected in list
On P0, P1.0, P1.1, P3.6, P3.7 port on piece electromechanics road, key group is connected on the P2 ports of single chip circuit；
The sampling tachometer circuit is serially connected in by sampling resistor R2 in the current supply circuit of brush direct current motor MOTO1, is adopted
Sample tachometer circuit carries out signal condition to the voltage pulse on sampling resistor and obtains square wave, and be sent into the counter of single chip circuit
T1 port carries out counting processing acquisition motor speed, and show by liquid crystal display；
Electromagnetic signal outside the brush direct current motor MOTO1 shells that the inductive electromagnetic tachometer circuit is sensed by induction coil L1
It feeds back to inductive electromagnetic tachometer circuit to be improved to obtain pulse signal, and the timer T0 ports for being sent into single chip circuit carry out
Operation obtains motor speed, is shown by liquid crystal display；
Key group is made of button K1~K5, realizes the switching of measurement method.
The sampling resistor R2 is 0.1 Ω 1W, is formed by 20 2 Ω resistor coupled in parallel.
The induction coil L1 be 200 circles more than self-control coupling hollow coil, width >=more than 4cm, length >=
8cm。
The sampling tachometer circuit is made of twin voltage comparator V1, resistance R3~R10, capacitance C1~C3, wherein resistance
R4 and capacitance C1 forms differential circuit and is connected on sampling resistor R2 both ends, and separated by direct communication is carried out, then pass through resistance R3 to sampled signal
High frequency is carried out with the filter circuit that capacitance C2 is formed to filter out, and input-end of twin voltage comparator V1 is then sent by resistance R5
Mouthful, the differentiated waveform that the voltage back diffirence and capacitance C3, resistance R7 and resistance R6 that resistance R6 and R8 are formed are formed is to input signal
The barrier on noise temporal is carried out, pulse signal is obtained through current-limiting resistance R9 and pull-up resistor R10 by twin voltage comparator V1
The counter t1 port for being sent into single chip circuit carries out counting processing.
The inductive electromagnetic tachometer circuit is made of twin voltage comparator V2, resistance R11~R18, capacitance C4~C6, wherein
The inductive signal of induction coil L1 carries out operating point partial pressure by resistance R12, R13 and raises, then carry out benchmark electricity by capacitance C4
The filtering of pressure, it is ensured that coupling waveform is above and below 2.5V, and coupled signal passes through resistance R11 current limlitings, after capacitance C5 stopping direct currents
It is sent into input-end of twin voltage comparator V2, input+end of twin voltage comparator V2, resistance R14~R16 and capacitance C6 groups
Into network, the partial pressure model of the network and resistance R12 and R13 is compared, wherein resistance R14 and R16 composition voltage back diffirences, electricity
R14~R15 is hindered, capacitance C6 carries out differential process, and whole network is realized the return difference of time and amplitude, so as to filter clutter, obtained
Stable pulse signal, the pulse signal is directly proportional to the rotating speed of brush direct current motor, by by the pulse signal and microcontroller
The timer counter mouth T0 connections of circuit collect the frequency of pulse signal by singlechip interruption, so as to calculate the speed measured
Degree.
Compared with prior art, a kind of brush direct current motor tachometer circuit that the utility model discloses has following beneficial
Part：Simultaneously there is contact to test the speed in the circuit to test the speed with contactless, wherein contact tests the speed is concatenated by sampling resistor
In the armature supply circuit of motor, by the voltage pulse signal on sampling resistor is modulated to obtain square wave be sent into it is single
Counted in piece machine, so as to obtain motor speed, it is contactless test the speed by homemade coupling coil from outside to motor case outside
Electromagnetic signal is sensed, and is combined adjusting circuit and the signal of sensing is adjusted operation in feeding microcontroller；
Two kinds of forms need not all change the structure and appearance of motor, can realize and be directly connected to measure, and measure and stablize
Good, the strong antijamming capability of property, high certainty of measurement, while measuring circuit is small, it is at low cost.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model brush direct current motor tachometer circuit；
Fig. 2 is the partial circuit diagram of the utility model sampling tachometer circuit；
Fig. 3 is the partial circuit diagram of the utility model inductive electromagnetic tachometer circuit.
Specific embodiment
Below in conjunction with the attached drawing of the utility model, the technical solution of the utility model embodiment is carried out clear, complete
Description.
As shown in Figures 1 to 3, the revealed a kind of brush direct current motor tachometer circuit of the utility model, including monolithic electromechanics
Road, liquid crystal display, key group, sample tachometer circuit, inductive electromagnetic tachometer circuit, brush direct current motor, sampling resistor R2 and
Induction coil L1, wherein：
Single chip circuit is microcontroller STC11F32XE minimum circuits, and P0 ports connection pull-up resistor RL2, P2 ports connect
Connect pull-up resistor RL3, P1 ports connection pull-up resistor RL1.
Liquid crystal display selects LCD240128, connects P0, P1.0, P1.1, P3.6, P3.7 port of microcontroller, liquid
It is grounded after the 20 pin serial connection variable resistance W1 and resistance R1 of crystal display screen serial ports, the adjustable side of 4 feet connection variable resistance W1.
Key group is made of button K1~K5, and the control to tachometer circuit is realized in connection microcontroller P2 ports.
The sampling tachometer circuit is made of twin voltage comparator V1, resistance R3~R10, capacitance C1~C3, passes through sampling
Resistance R2 is serially connected in the current supply circuit of brush direct current motor MOTO1, and brush direct current motor is inputted by external direct current power supply and powered,
With the rotation of brush motor, voltage pulse signal is generated on sampling resistor, samples resistance R4 and capacitance C1 in tachometer circuit
It forms differential circuit and is connected on sampling resistor R2 both ends, separated by direct communication is carried out, then pass through resistance R3 and capacitance to sampling pulse signal
The filter circuit that C2 is formed carries out high frequency and filters out, and input-port of twin voltage comparator V1, resistance are then sent by resistance R5
The differentiated waveform that the voltage back diffirence and capacitance C3, resistance R7 and resistance R6 that R6 and R8 is formed are formed makes an uproar to input signal
The barrier of sound time obtains pulse square wave signal by twin voltage comparator V1 and is sent into through current-limiting resistance R9 and pull-up resistor R10
The counter t1 port of single chip circuit carries out counting processing, so as to obtain motor speed, is shown by liquid crystal display.
Sampling resistor R2 is 0.1 Ω 1W, is formed by 20 2 Ω resistor coupled in parallel.
The inductive electromagnetic tachometer circuit is made of twin voltage comparator V1, resistance R3~R10, capacitance C1~C3, is passed through
The outer electromagnetic signal of induction coil L1 sensing brush direct current motor MOTO1 shells, inductive signal carry out operating point by resistance R12, R13
Partial pressure is raised, then is carried out benchmark by filter capacitor C4 and coupled raising for waveform, it is ensured that coupling waveform is above and below 2.5V, coupling letter
Number pass through resistance R11 current limlitings, at input-end that twin voltage comparator V2 is sent into after capacitance C5 stopping direct currents, twin voltage compares
Input+end of device V2, resistance R14~R16 and capacitance C6 network consistings, the partial pressure model of the network and resistance R12 and R13 into
Row compares, and wherein resistance R14 and R16 composition voltage back diffirences, resistance R14~R15, capacitance C6 carry out differential process, whole network
It realizes the return difference of time and amplitude, so as to filter clutter, obtains stable pulse signal, the pulse signal and brush direct current motor
Rotating speed it is directly proportional, by by the timer counter mouth T0 connections of the pulse signal and single chip circuit, being adopted by singlechip interruption
Collect the frequency of pulse signal, so as to calculate the speed measured, by liquid crystal display screen display not.
The induction coil is the self-control coupling hollow coil of 200 circles, and coil wide more than 4cm, long more than 8cm are improved
The inductive signal ability of induction coil.
The technology contents and technical characteristic of the utility model have revealed that as above, however those skilled in the art still may be used
Teaching and announcement that can be based on the utility model and make various replacements and modification without departing substantially from the spirit of the present invention, therefore, this
Utility model protection range should be not limited to the revealed content of embodiment, and should include the various replacements without departing substantially from the utility model
And modification, and covered by present patent application claim.
Claims (5)
1. a kind of brush direct current motor tachometer circuit, it is characterised in that：Including single chip circuit, liquid crystal display, key group is adopted
Sample tachometer circuit, inductive electromagnetic tachometer circuit, brush direct current motor, sampling resistor R2, wherein induction coil L1, liquid crystal display
It is serially connected on P0, P1.0, P1.1, P3.6, P3.7 port of single chip circuit, key group is connected to the P2 ports of single chip circuit
On；
The sampling tachometer circuit is serially connected in by sampling resistor R2 in the current supply circuit of brush direct current motor MOTO1, and sampling is surveyed
Fast circuit carries out signal condition to the voltage pulse on sampling resistor and obtains square wave, and be sent into the counter T1 ends of single chip circuit
Mouth carries out counting processing acquisition motor speed, and show by liquid crystal display；
Electromagnetic signal is fed back outside the brush direct current motor MOTO1 shells that the inductive electromagnetic tachometer circuit is sensed by induction coil L1
It is improved to obtain pulse signal to inductive electromagnetic tachometer circuit, and the timer T0 ports for being sent into single chip circuit carry out operation
Motor speed is obtained, is shown by liquid crystal display；
Key group is made of button K1~K5, realizes the switching of measurement method.
2. brush direct current motor tachometer circuit according to claim 1, it is characterised in that：The sampling resistor R2 is 0.1
Ω 1W resistance.
3. brush direct current motor tachometer circuit according to claim 1, it is characterised in that：The induction coil L1 is 200
Self-control coupling hollow coil more than circle, width >=4cm, length >=8cm.
4. brush direct current motor tachometer circuit according to claim 2, it is characterised in that：The sampling tachometer circuit is by double
Voltage comparator V1, resistance R3~R10, capacitance C1~C3 compositions, wherein resistance R4 and capacitance C1 formation differential circuits are connected on and adopt
Sample resistance R2 both ends carry out sampled signal separated by direct communication, then carry out height by the filter circuit that resistance R3 and capacitance C2 is formed
Frequency filters out, then by input-port of resistance R5 feeding twin voltage comparators V1, the voltage back diffirence that resistance R6 and R8 are formed,
And capacitance C3, resistance R7 and the differentiated waveform of resistance R6 formation carry out input signal the barrier on noise temporal, by double
Voltage comparator V1 obtains the counter t1 port that pulse signal is sent into single chip circuit through current-limiting resistance R9 and pull-up resistor R10
Carry out counting processing.
5. brush direct current motor tachometer circuit according to claim 3, it is characterised in that：The inductive electromagnetic tachometer circuit
It is made of twin voltage comparator V2, resistance R11~R18, capacitance C4~C6, the inductive signal of wherein induction coil L1 passes through resistance
R12, R13 carry out operating point partial pressure and raise, then the filtering of reference voltage is carried out by capacitance C4, it is ensured that coupling waveform in 2.5V,
Coupled signal passes through resistance R11 current limlitings, using input-end that twin voltage comparator V2 is sent into after capacitance C5 stopping direct currents, double electricity
Press input+end of comparator V2, resistance R14~R16 and capacitance C6 network consistings, the partial pressure of the network and resistance R12 and R13
Model is compared, and wherein resistance R14 and R16 composition voltage back diffirences, resistance R14~R15, capacitance C6 carry out differential process, whole
The return difference of a network implementation time and amplitude so as to filter clutter, obtains stable pulse signal, which has with direct current
The rotating speed of brush motor is directly proportional, by by the timer counter mouth T0 connections of the pulse signal and single chip circuit, passing through microcontroller
Interrupt acquisition to pulse signal frequency, so as to calculate the speed measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721298181.6U CN207557287U (en) | 2017-10-09 | 2017-10-09 | A kind of brush direct current motor tachometer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721298181.6U CN207557287U (en) | 2017-10-09 | 2017-10-09 | A kind of brush direct current motor tachometer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207557287U true CN207557287U (en) | 2018-06-29 |
Family
ID=62676911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721298181.6U Expired - Fee Related CN207557287U (en) | 2017-10-09 | 2017-10-09 | A kind of brush direct current motor tachometer circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN207557287U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376397A (en) * | 2019-08-15 | 2019-10-25 | 杭州电子科技大学 | The quick tachometer circuit of single-phase asynchronous AC tachometer generator high-precision |
-
2017
- 2017-10-09 CN CN201721298181.6U patent/CN207557287U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376397A (en) * | 2019-08-15 | 2019-10-25 | 杭州电子科技大学 | The quick tachometer circuit of single-phase asynchronous AC tachometer generator high-precision |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 Termination date: 20201009 |
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| CF01 | Termination of patent right due to non-payment of annual fee |