CN104410047A - Temperature protection circuit of brushless motor - Google Patents
Temperature protection circuit of brushless motor Download PDFInfo
- Publication number
- CN104410047A CN104410047A CN201410508618.9A CN201410508618A CN104410047A CN 104410047 A CN104410047 A CN 104410047A CN 201410508618 A CN201410508618 A CN 201410508618A CN 104410047 A CN104410047 A CN 104410047A
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- China
- Prior art keywords
- circuit
- chip microcomputer
- motor
- temperature
- kty
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention discloses a temperature protection circuit of a brushless motor, and relates to the field of circuit protection. The circuit comprises a KTY resistor, a precision resistor, an isolation amplifier, a digital-to-analog converter, a single-chip microcomputer, a comparator and an or gate circuit, wherein the KTY resistor is connected in series with the precision resistor; stable direct current voltage is applied at the two ends of the KTY resistor and the precision resistor; a voltage signal of the precision resistor is isolated and amplified by the isolation amplifier and divided into two ways; one way is compared with voltage comparison reference calculated according to a safe temperature value by the comparator to generate a control signal OT1; the other amplified voltage signal is connected into the single-chip microcomputer by the analog-to-digital converter; when the single-chip microcomputer calculates to obtain that the temperature of a motor coil reaches a safety threshold, a control signal OT2 is given by IO; and OT1 and OT2 jointly control a contactor located on an input line of the motor by the or gate circuit to realize on-off control of a power supply of the motor. The circuit can independently monitor and display the temperature of the motor coil at high sensitivity and in real time.
Description
Technical field
The present invention relates to circuit protection field, be specifically related to a kind of temperature protection circuit of brushless electric machine.
Background technology
Only have one group of coil electricity different when working from brush motor, brushless electric machine carries out commutation by non-carbonate electronics mode, and motor operationally electric current is regular alternately through three groups of coils according to commutation algorithm.Under the normal operating state of motor, electric current is limited in rated range, and motor coil heating, in controlled range, can not cause damage to motor.But under there is the fortuitous events such as overload, phase shortage and stall at motor, the electric current in motor coil may sharply rise, and causes motor coil temperature too high.If motor continues to run, the insulating barrier of motor coil is easy to puncture and cause motor damage.
Temperature protection circuit at present on the market for brushless electric machine is of a great variety, and major defect comprises:
1. the structure of apparatus design is too complicated, and use cost is very high;
2. temperature detection is inaccurate, cannot correctly in time protect brushless electric machine according to design temperature.May occur temperature higher than secure threshold do not produce yet protection or temperature do not reach secure threshold and mistake occur protection situation, the previous case can cause the damage of motor, and latter event can affect the normal operation of motor.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of temperature protection circuit of brushless electric machine, solving current brushless electric machine temperature protection circuit sensitivity deficiency, and the problem of the too complicated high cost of structure.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A temperature protection circuit for brushless electric machine, this circuit comprises: KTY resistance, precision resistance, isolated amplifier, digital to analog converter, single-chip microcomputer, comparator and OR circuit; KTY resistance and precision resistance series connection, add stable DC voltage at its two ends, the voltage signal of precision resistance is isolated by isolated amplifier and amplifies, and is divided into two paths of signals; Comparator of wherein leading up to carries out contrasting rear generation control signal OT with the voltage compare benchmark calculated according to safe temperature value
1; Voltage signal after an other road amplification accesses single-chip microcomputer by analog to digital converter, provides control signal OT when single-chip microcomputer is by calculating motor coil temperature and reaching secure threshold by IO
2; OT
1and OT
2be positioned at the contactor on motor incoming line through OR circuit co-controlling, the break-make realizing motor power controls.
The invention has the beneficial effects as follows: the present invention can high sensitivity, independently Real-Time Monitoring and display are carried out to motor coil temperature; when a certain coil reaches design temperature secure threshold; namely can provide control signal and make the power supply of power supply stopping to brushless electric machine, play the overheat protector effect to brushless electric machine.
Accompanying drawing explanation
The position view that Fig. 1 KTY resistance of the present invention is installed in motor.
The structural representation of the temperature protection circuit of a kind of brushless electric machine of Fig. 2 the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
KTY resistance is a kind of thermistor, and its resistance and temperature have the corresponding relation determined, can obtain temperature information by measuring its resistance.As shown in Figure 1, first KTY resistance is arranged on the three-phase coil of brushless electric machine, realizes the measurement to motor coil temperature by designed measuring circuit,
The temperature survey principle of three characteristics of the middle term coil is all identical, existing only just wherein the measurement of a phase and protection philosophy elaborate, two-phase then repeats no more in addition.The measurement of KTY resistance is realized by circuit as shown in Figure 2: by a resistance R
1after KTY resistant series, add a galvanic current pressure V at its two ends
dC, then by measuring R
1the voltage V at two ends
1just can obtain KTY resistance value, computing formula is:
Due to V
dCand R
1be all known physical amount, the resistance measurement problem of such KTY resistance is just converted into voltage V
1measure, voltage signal V
1by the isolation of isolated amplifier and after amplifying, be divided into two paths of signals: the voltage signal wherein after a road amplification accesses single-chip microcomputer by ADC, this signal is exported to controller display module for system and user's monitoring by single-chip microcomputer after computing, provides control signal OT when single-chip microcomputer is by calculating motor coil temperature and reaching secure threshold by IO
2; Comparator of leading up in addition carries out contrasting rear generation control signal OT with the voltage compare benchmark calculated according to secure threshold
1, when cannot provide correct I/O signal when there is the software faults such as deadlock, program error when single-chip microcomputer, reach the overheat protector to motor; Final OT
1and OT
2be positioned at the contactor on motor incoming line through a logic OR chip co-controlling, the break-make being realized motor power by electric machine controller is controlled, and cutting off the electricity supply at once, playing the protective effect to motor when detecting when coil temperature reaches secure threshold.
Thisly pass through OT
1and OT
2two signals carry out the mode of two protection; while playing the powerful calculating of single-chip microcomputer and peripheral expansion ability; the comparison circuit utilizing pure hardware to build can provide the available protecting to motor when single-chip microcomputer occurs abnormal; thus improve the fail safe of whole system, more reliable overheat protector is carried out to motor.
Wherein, resistance R
1for resistance 470 Ω, the precision resistance of precision 0.05%; Applied voltage is stable 12V direct voltage V
dC; Isolated amplifier is OP07 micro current amplifier; ADC is AD0809 digital to analog converter; Comparator is LM393 twin voltage comparator integrated circuit; Logic OR chip is 74HC32 OR circuit.
Claims (2)
1. a temperature protection circuit for brushless electric machine, is characterized in that, this circuit comprises: KTY resistance, precision resistance, isolated amplifier, digital to analog converter, single-chip microcomputer, comparator and OR circuit; KTY resistance and precision resistance series connection, add stable DC voltage at its two ends, the voltage signal of precision resistance is isolated by isolated amplifier and amplifies, and is divided into two paths of signals; Comparator of wherein leading up to carries out contrasting rear generation control signal OT with the voltage compare benchmark calculated according to safe temperature value
1; Voltage signal after an other road amplification accesses single-chip microcomputer by analog to digital converter, provides control signal OT when single-chip microcomputer is by calculating motor coil temperature and reaching secure threshold by IO
2; OT
1and OT
2be positioned at the contactor on motor incoming line through OR circuit co-controlling, the break-make realizing motor power controls.
2. the temperature protection circuit of a kind of brushless electric machine as claimed in claim 1, is characterized in that, this circuit also comprises: controller display module; The voltage signal amplified accesses single-chip microcomputer by digital to analog converter, and this signal is exported to controller display module through computing by single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410508618.9A CN104410047A (en) | 2014-09-26 | 2014-09-26 | Temperature protection circuit of brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410508618.9A CN104410047A (en) | 2014-09-26 | 2014-09-26 | Temperature protection circuit of brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104410047A true CN104410047A (en) | 2015-03-11 |
Family
ID=52647652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410508618.9A Pending CN104410047A (en) | 2014-09-26 | 2014-09-26 | Temperature protection circuit of brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104410047A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066593A (en) * | 2018-07-24 | 2018-12-21 | 加码技术有限公司 | A kind of thermal-shutdown circuit |
| CN113933057A (en) * | 2021-09-01 | 2022-01-14 | 郑州嘉晨电器有限公司 | Method and system for detecting locked rotor of permanent magnet motor |
Citations (7)
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|---|---|---|---|---|
| US5635806A (en) * | 1994-12-29 | 1997-06-03 | Hilti Aktiengesellschaft | Method and apparatus for temperature monitoring of universal or AC/DC motors |
| CN1426148A (en) * | 2002-09-19 | 2003-06-25 | 刘开绪 | Carrier type motor alarm protector |
| CN101589546A (en) * | 2007-03-29 | 2009-11-25 | 丰田自动车株式会社 | Motor control device, control method, and control program |
| CN101634667A (en) * | 2008-07-24 | 2010-01-27 | 盖茨股份有限公司 | Method and circuit for measuring average current of direct current motor |
| CN201496284U (en) * | 2009-08-20 | 2010-06-02 | 楼生高 | Submerged pump controller |
| CN101950951A (en) * | 2010-09-25 | 2011-01-19 | 傅哲龙 | Protection device for multiple monitoring of motor faults |
| CN202026268U (en) * | 2011-04-28 | 2011-11-02 | 中山大洋电机制造有限公司 | Direct current brushless motor controller having temperature protection function |
-
2014
- 2014-09-26 CN CN201410508618.9A patent/CN104410047A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5635806A (en) * | 1994-12-29 | 1997-06-03 | Hilti Aktiengesellschaft | Method and apparatus for temperature monitoring of universal or AC/DC motors |
| CN1426148A (en) * | 2002-09-19 | 2003-06-25 | 刘开绪 | Carrier type motor alarm protector |
| CN101589546A (en) * | 2007-03-29 | 2009-11-25 | 丰田自动车株式会社 | Motor control device, control method, and control program |
| CN101634667A (en) * | 2008-07-24 | 2010-01-27 | 盖茨股份有限公司 | Method and circuit for measuring average current of direct current motor |
| CN201496284U (en) * | 2009-08-20 | 2010-06-02 | 楼生高 | Submerged pump controller |
| CN101950951A (en) * | 2010-09-25 | 2011-01-19 | 傅哲龙 | Protection device for multiple monitoring of motor faults |
| CN202026268U (en) * | 2011-04-28 | 2011-11-02 | 中山大洋电机制造有限公司 | Direct current brushless motor controller having temperature protection function |
Non-Patent Citations (1)
| Title |
|---|
| 曲弋: "电动机热特性研究及单片机电动机热保护器的研制", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066593A (en) * | 2018-07-24 | 2018-12-21 | 加码技术有限公司 | A kind of thermal-shutdown circuit |
| CN109066593B (en) * | 2018-07-24 | 2020-01-21 | 加码技术有限公司 | Over-temperature protection circuit |
| CN113933057A (en) * | 2021-09-01 | 2022-01-14 | 郑州嘉晨电器有限公司 | Method and system for detecting locked rotor of permanent magnet motor |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150311 |