CN205265571U - Brushless DC motor speed adjusting device - Google Patents
Brushless DC motor speed adjusting device Download PDFInfo
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- CN205265571U CN205265571U CN201521009261.6U CN201521009261U CN205265571U CN 205265571 U CN205265571 U CN 205265571U CN 201521009261 U CN201521009261 U CN 201521009261U CN 205265571 U CN205265571 U CN 205265571U
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Abstract
The utility model discloses a brushless DC motor speed adjusting device has designed one kind and has adopted IGBT device, DSP chip, PWM control circuit and various protection circuit, the device has added current detection circuit and speed detection circuit in motor speed -adjusting system to make the stability and the security of motor operation improve greatly, the device can make the motor realize in a flexible way opening / stopping, just / reversal, come to satisfy different industrial production demands, but also has added and overflow, excessive pressure, overheated, short circuit, lack protection circuit and display circuits such as looks, hypervelocity for the motor reliability of operation promotes greatly.
Description
Technical field
The utility model relates to electric machines control technology field, is specifically related to a kind of brshless DC motor arrangements for speed regulation.
Background technology
Nineteen fifty-five American D.Harrison replaces the mechanical brush that has brushless motor with transistor commutation circuit, indicate the birth of modern brushless direct current generator. Brshless DC motor (BLDC) has simple in structure compared with alternating current generator, stable, many features such as reliability is high, easy to maintenance, and startup and speed adjusting performance are good, along with the appearance of novel permanent magnetic material and the fast development of related electronic devices, brshless DC motor is not only applied to traditional industry field, and is applied to more and more many infant industries field, as space flight military project, electronics is produced, medicine equipment etc.
Had on the market at present tens kinds of brshless DC motor arrangements for speed regulation of many manufacturer production, but its speed adjusting performance is uneven, and price also varies, better speed regulator price exceedes several thousand, and the most cheap tens yuan also have. The speed regulator of these manufacturer production mostly adopts serial-resistance speed-regulation, or decompression speed, the speed regulator speed governing of minority high-level points mainly changes average voltage by pwm circuit and controls, moment is mainly controlled by electric current, generally can be with a supporting motor driver, change the output voltage of driver, just can control the speed of motor.
Although present brshless DC motor speed regulator function can meet daily industrial production demand substantially, but still there is following problem: cost performance is not high, the price of function admirable is too high, and cheap structure is again too simple, and speed adjusting performance does not reach requirement; Unprotect device, many speed regulators are facing stall, overcurrent, overvoltage, when short circuits etc. likely threaten the situation of motor safety operation, stopcock device protection motor and line security in time; There is no digital display screen, can not the current speed of service of Real-Time Monitoring motor.
Summary of the invention
For above-mentioned problems of the prior art, the purpose of this utility model is, a kind of brshless DC motor arrangements for speed regulation are provided, and this device adopts pwm circuit, by changing dutycycle to change the mean value of voltage, thereby reaches the object of adjusting rotary speed.
In order to realize above-mentioned task, the utility model by the following technical solutions:
A kind of brshless DC motor arrangements for speed regulation, this device has added current detection circuit in motor speed regulation system, current detection circuit comprises NMOS FET Q1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, inductance L 1, operational amplifier OPAMP and slide rheostat POT1, wherein the source electrode of Q1 connects the upper end of R1, the lower end ground connection of R1, between Q1 and R1, connect successively the negative input end of R2, R3 and OPAMP, the positive input terminal of OPAMP ground connection after R4; One end ground connection of C2, connects power supply after another termination L1; The negative voltage side of OPAMP is connected between L1 and C2, the sliding end of the positive voltage termination POT1 of OPAMP, and POT1 is connected between the positive input terminal and output of OPAMP; One end of C1 is connected to the lower end of R1, and the other end is connected between R2, R3.
Further, described motor speed control device also comprises the speed detect circuit being added in motor speed regulation system, in speed detect circuit, be provided with optical-electricity encoder, utilize the interface unit of optical-electricity encoder that motor speed is sampled, calculated, and draw and the error between given rotating speed and actual speed electric current is regulated after speed regulator computing.
Further, described motor speed control device also comprises the energy-dissipating brake circuit, current foldback circuit, overvoltage crowbar and the display circuit that are added in motor speed regulation system.
The utlity model has following technical characterstic:
The utility model compared with prior art, makes the speed control of brushless direct-current ground motor more accurate having added after various holding circuits and display circuit motor to move more safety and have visualization interface; This apparatus structure is simple, and cost performance is high, and good speed adjustment features is provided with multiple protection measure for motor, ensures motor safety, operation stably, has improved production efficiency.
Brief description of the drawings
Fig. 1 is power-switching circuit of the present utility model;
Fig. 2 is crystal oscillating circuit of the present utility model;
Fig. 3 is reset design circuit of the present utility model;
Fig. 4 is current detection circuit of the present utility model;
Fig. 5 is voltage detecting circuit of the present utility model;
Fig. 6 is speed detect circuit of the present utility model;
Fig. 7 is drive circuit of the present utility model;
Fig. 8 is energy-dissipating brake circuit of the present utility model;
Fig. 9 is current foldback circuit of the present utility model;
Figure 10 is overvoltage crowbar of the present utility model;
Figure 11 is the structural representation of motor speed regulation system of the present utility model;
Detailed description of the invention
In order to solve the problem of existing brushless dc motor speed control, the utility model provides a kind of novel brshless DC motor arrangements for speed regulation. The mean value that this device adopts pwm circuit to change voltage by changing dutycycle reaches the object that changes rotating speed.
A kind of brshless DC motor arrangements for speed regulation, this device has added current detection circuit in motor speed regulation system, greatly improves with the stability and the security that make motor operation; Employing allows tested electric current flow through known resistance, then calculates the method for size of current by the voltage at measuring resistance two ends according to ohm law. At the resistance of electric current loop series connection respective resistance values and power, the voltage at these resistance two ends, through active power filtering, is sent into digital to analog converter after Amplification and insulation, sampled and just can be obtained the electric current of DC loop by AD;
As shown in Figure 4, current detection circuit comprises NMOS FET Q1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, inductance L 1, operational amplifier OPAMP and slide rheostat POT1, wherein the source electrode of Q1 connects the upper end of R1, the lower end ground connection of R1, between Q1 and R1, connect successively the negative input end of R2, R3 and OPAMP, the positive input terminal of OPAMP ground connection after R4; One end ground connection of C2, connects power supply after another termination L1; The negative voltage side of OPAMP is connected between L1 and C2, the sliding end of the positive voltage termination POT1 of OPAMP, and POT1 is connected between the positive input terminal and output of OPAMP; One end of C1 is connected to the lower end of R1, and the other end is connected between R2, R3.
In this programme, in existing motor speed regulation system, also add speed detect circuit, in speed detect circuit, be provided with optical-electricity encoder, utilize the interface unit of optical-electricity encoder that motor speed is sampled, calculated, and draw the error between given rotating speed and actual speed, after speed regulator computing, electric current is regulated, as shown in Figure 6. Optical-electricity encoder output signal is through light-coupled isolation, then process four-way differential received chip is sent into DSP computing.
Brshless DC motor can be because power network current increases in actual moving process, motor short circuit, and the reasons such as stall make bus current excessive, threaten motor security of operation. On foregoing circuit basis, add again various holding circuits, escort to the safe operation of motor. Comprise energy-dissipating brake circuit, current foldback circuit, overvoltage crowbar.
This programme has also increased display circuit in motor speed regulation system, can allow user's Real-Time Monitoring motor speed, is more conducive to the Precise control of motor. Adopting the object of display circuit is mainly by motor actual motion speed and given speed in LCD screen display out, makes whole governing system have visual interface.
Motor speed regulation system described in this programme as shown in figure 11. In this system:
Power-switching circuit: grid alternating current is through step-down, rectification, filtering, voltage stabilizing, give power electronics after filtering again, what wherein Brush-Less DC motor control circuit adopted is+5V voltage, in addition+5V returns encoder, hall position sensor and segment chip power supply, DSP supply voltage employing+3.3V, drive circuit employing+48V voltage. Power-switching circuit is as Fig. 1. What voltage-stabilized power supply was inputted is+5V DC voltage. Chip TPS7333 can be by the DC voltage of the be converted to+3.3V of DC voltage of+5V. And can provide power-on reset signal.
Crystal oscillating circuit: the phase-locked loop clock module of TM320LF2407 inside can provide three kinds of clocks, CPULOCK, SYSLOCK, any ancillary equipment being directly connected with cpu bus of WATCH is all to adopt CPULOCK, comprises external memory interface. System crystal oscillating circuit as shown in Figure 2.
In running, may there are various uncertain noises phenomenons in reset circuit: DSP, for stability and the reliability of the operation of guarantee system, must design reset circuit and ensure after system breaks down to reset and can normally move. Reset circuit has hand-reset and two kinds of reset modes of electrification reset, and this programme adopts chip TPS3125 to realize hand-reset. Reset circuit figure as shown in Figure 3.
Current detection circuit: the electric current loop of Speed Regulation Systems of BLDCM connects and detects DC bus current, current detecting generally has two kinds of methods, one is to adopt to detect electric current by Hall element, but Hall element is expensive, and cost performance is not high; Another kind is to allow tested electric current flow through known resistance, then calculates size of current according to ohm law by the voltage at measuring resistance two ends. This programme adopts second method, and at the resistance of electric current loop series connection respective resistance values and power, the voltage at these resistance two ends, through active power filtering, is sent into digital to analog converter after Amplification and insulation, sampled and just can be obtained the electric current of DC loop by AD. In Fig. 4, R2 and C1 form single order RC low pass filter, in order to filtered voltage spike. Filter the perception interference that seals in power supply with inductance L1.
Speed detect circuit: as shown in Figure 6. Optical-electricity encoder output signal is through light-coupled isolation, then process four-way differential received chip is sent into DSP computing.
The special mixing integrated drive of the many employings of driving of drive circuit: IGBT; as the M579 series of Mitsubishi; Fig. 7 is M57962L type IGBT drive circuit figure; its inside has surrender and detection and link of protection; in the time there is overcurrent, can respond fast but turn-off at a slow speed IGBT, and providing fault-signal to external circuit. The positive driving voltage of M57962L output is+15V left and right that negative driving voltage is-10V.
Energy-dissipating brake circuit: energy-dissipating brake circuit is in order to prevent that busbar voltage from raising, the effect of protection components and parts, circuit is as shown in Figure 8. In the time that the voltage between the PN of electric capacity two ends has exceeded specific amplitude limit, chip TLP250 can send signal by the conducting of Q2 pipe, and R4 is dynamic braking resistance, can consume electric energy and play the object of step-down.
Current foldback circuit: brshless DC motor can be because power network current increases in actual moving process, motor short circuit, the reasons such as stall make bus current excessive, threaten motor security of operation. In designed herein current foldback circuit, overcurrent is through RC circuit to capacitor charging, if the time is less than setting-up time, over-current signal disappears and protects action to be failure to actuate. If being greater than setting-up time, the time protects action. In Fig. 9, RS is reset signal, and OI is the output of overcurrent protection locking pulse, and KOI is overcurrent protection action output.
Overvoltage crowbar: busbar voltage increases can produce fatal harm to motor equally; so overvoltage protection also will be set, circuit as shown in figure 10: when busbar voltage exceedes when setting value, circuit outputs level signals is sent in DSP through light-coupled isolation; open interrupt routine, allow motor stalling.
Display circuit: busbar voltage increases can produce fatal harm to motor equally; so overvoltage protection also will be set, and circuit is illustrated in fig. 11 shown below: in the time that busbar voltage exceedes setting value, circuit outputs level signals is sent in DSP through light-coupled isolation; open interrupt routine, allow motor stalling.
The circuit of not mentioning in detail in this programme, all adopts custom circuit.
Claims (3)
1. brshless DC motor arrangements for speed regulation, is characterized in that, this device is at electric machine speed regulationIn system, added current detection circuit, current detection circuit comprise NMOS FET Q1,Resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, inductance L 1,Operational amplifier OPAMP and slide rheostat POT1, wherein the source electrode of Q1 connects the upper end of R1,The lower end ground connection of R1 connects successively the negative input of R2, R3 and OPAMP between Q1 and R1End, the positive input terminal of OPAMP ground connection after R4; One end ground connection of C2, another termination L1After connect power supply; The negative voltage side of OPAMP is connected between L1 and C2, the positive voltage terminal of OPAMPConnect the sliding end of POT1, POT1 is connected between the positive input terminal and output of OPAMP; C1One end be connected to the lower end of R1, the other end is connected between R2, R3.
2. brshless DC motor arrangements for speed regulation as claimed in claim 1, is characterized in that, instituteThe motor speed control device of stating also comprises the speed detect circuit being added in motor speed regulation system, turnsIn speed testing circuit, be provided with optical-electricity encoder, utilize the interface unit pair of optical-electricity encoderMotor speed is sampled, is calculated, and draws the error between given rotating speed and actual speed,After speed regulator computing, electric current is regulated.
3. brshless DC motor arrangements for speed regulation as claimed in claim 1, is characterized in that, instituteThe motor speed control device of stating also comprises the energy-dissipating brake circuit, the mistake that are added in motor speed regulation systemStream holding circuit, overvoltage crowbar and display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521009261.6U CN205265571U (en) | 2015-12-07 | 2015-12-07 | Brushless DC motor speed adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521009261.6U CN205265571U (en) | 2015-12-07 | 2015-12-07 | Brushless DC motor speed adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205265571U true CN205265571U (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521009261.6U Expired - Fee Related CN205265571U (en) | 2015-12-07 | 2015-12-07 | Brushless DC motor speed adjusting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN205265571U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888072A (en) * | 2017-12-14 | 2018-04-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Appliances power source control device and control method |
| CN110761860A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Thermoelectric unit simulation system |
-
2015
- 2015-12-07 CN CN201521009261.6U patent/CN205265571U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888072A (en) * | 2017-12-14 | 2018-04-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Appliances power source control device and control method |
| CN110761860A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Thermoelectric unit simulation system |
| CN110761860B (en) * | 2018-07-25 | 2022-03-04 | 中国石油化工股份有限公司 | Thermoelectric unit simulation 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160525 Termination date: 20181207 |