CN101304229A - Driving device for electric machine - Google Patents
Driving device for electric machine Download PDFInfo
- Publication number
- CN101304229A CN101304229A CNA2007101024338A CN200710102433A CN101304229A CN 101304229 A CN101304229 A CN 101304229A CN A2007101024338 A CNA2007101024338 A CN A2007101024338A CN 200710102433 A CN200710102433 A CN 200710102433A CN 101304229 A CN101304229 A CN 101304229A
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- temperature
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- motor
- converter circuit
- motor driver
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Abstract
The invention provide a motor drive unit which solves the problems that can keep down the effect of the noise of the power line from the drive current supplies to a motor and can keep down the misfunction of a temperature protecting circuit. The invention is characterized in that the temperature protecting circuit 40 is provided with a thermistance 42 which is used for checking the temperature of a heat absorber 50 which is arranged on each of the switching units from FET1 to FET6 which are arranged on a current converter circuit 30. If the temperature checked by the thermistance 42 is equal to or higher than the preset temperature, a temperature detection signal T can be output to a controlling part 70; the controlling part 70 which accepts the input of the temperature detection signal T causes the motor 20 to stop rotating or to reduce the rotating speed.
Description
Technical field
The present invention relates to motor driver, particularly relate to the motor driver of the temperature protection of seeking switch element.
Background technology
As the drive unit of brushless DC motor, have and possess converter circuit that constitutes by a plurality of switch elements and the device that each switch element output PWN signal is carried out PWN control.In the drive unit of such brushless DC motor,, the switch element of protecting converter circuit avoids being provided with temperature protection circuit because of the heat damage that causes that excessively heats up for making it.
In the past; as such temperature protection circuit, known have the PTC thermistor of temperature of switch element that will detect converter circuit (PTC: positive temperature coefficient) etc. temperature detecting unit directly be installed on the switch element of converter circuit or be installed to circuit (1 spy opens the 2005-80349 communique with reference to patent documentation) near the circuit board back side of switch element.
If the detected temperatures of the temperature detecting unit of this temperature protection circuit rises to more than or equal to predetermined temperature; then to the control section output temperature detection signal of motor driver IC etc.; restriction is to the input current of motor, the rotation of motor stopped or rotary speed is descended.
Summary of the invention
But; in above-mentioned temperature protection circuit; owing near the power line of motor input drive current, connecting up from the holding wire of temperature detecting unit, so existence is subjected to causing from the The noise of power line the danger that delays work of temperature protection circuit to control section input temp detection signal to being used for.
Therefore, the present invention carries out in view of the above problems, and its purpose is to provide the motor driver that delays work that can suppress temperature protection circuit from the The noise of power line by alleviating.
The invention relevant with a first aspect of the present invention is to be the motor driver of feature with following: have the converter circuit that is made of a plurality of switch elements; control the control unit of above-mentioned converter circuit and protect above-mentioned each switch element of above-mentioned converter circuit to avoid in the motor driver of the temperature protection unit that temperature rises; if the said temperature protected location has the temperature detecting unit of the temperature that detects the heat absorber on above-mentioned each switch element be installed to above-mentioned converter circuit and utilize the detected temperature of said temperature detecting unit more than or equal to predetermined temperature then to the output unit of above-mentioned control unit output temperature detection signal; if the input of said temperature detection signal, then above-mentioned control unit stop the rotation of above-mentioned motor or rotary speed is descended.
The invention relevant with a second aspect of the present invention is to be the relevant motor driver with a first aspect of the present invention of feature with following: above-mentioned motor is a brushless DC motor.
The invention relevant with a third aspect of the present invention be with following be feature with of the present invention first or the relevant motor driver of second aspect: the extension that on above-mentioned heat absorber, is provided for installing above-mentioned temperature detecting unit.
The invention relevant with a fourth aspect of the present invention is to be the relevant motor driver of the either side with first to three aspect of the present invention of feature with following: the said temperature detecting unit is a thermistor.
In motor driver of the present invention, owing to temperature detecting unit is connected on the switch element through heat absorber, so can isolate to the holding wire of control section input temp detection signal and power line from drive current to motor that import from temperature detecting unit.Therefore, can alleviate from the The noise of power line to suppress delaying work of temperature protection circuit.
Description of drawings
Fig. 1 is the converter circuit relevant with one embodiment of the invention and the circuit diagram of temperature protection circuit.
Fig. 2 is the block diagram of the motor driver relevant with one embodiment of the invention.
Fig. 3 is the profile that is illustrated in the state that heat absorber has been installed on the circuit board.
Description of reference numerals
10 motor drivers
20 motors
30 converter circuits
40 temperature protection circuits
42 thermistors
50 heat absorbers
53 extensions
70 control sections
The 72PWM circuit
74 logical circuits
76 speed test sections
78 master control parts
The T temperature detection signal
Embodiment
Below, one embodiment of the invention are described with reference to the accompanying drawings.
Fig. 1 is the circuit diagram of the motor driver 10 relevant with present embodiment, and Fig. 2 is the block diagram of motor driver 10, and Fig. 3 is the profile of heat absorber 50.
The motor 20 that utilizes motor driver 10 drivings of present embodiment is brushless DC motors of 3 layers, possesses: have coil 22u, the 22v that has carried out the Y line, the stator of 22w; Rotor with a pair of magnetic pole; And the Hall element 24 that is used for the rotary speed of detection rotor.
This motor driver 10 is made of following part: the converter circuit 30 of supplying with the drive current of 3 phases respectively to coil 22u, 22v, 22w; The temperature that detects motor 20 makes it avoid the temperature protection circuit 40 that excessive temperature rises with protection motor 20; And by pwm circuit 72, logical circuit 74, speed test section 76, and master control part 78 constitute and motor 20 carried out the control section 70 of drive controlling.
6 FET that constitute converter circuit 30 (are FET1～FET6) such as shown in Figure 3, but are being fixed under the state of heat exchange on the heat absorber 50 of section for L word shape roughly.In detail, heat absorber 50 by metal base plate 52, from an end of this base plate 52 vertically uprightly be provided with plate 54 uprightly is set, with base plate 52 with the vertically upright fin 56 that is provided with of plate 54 uprightly is set constitutes, FET1～FET6 be fixed on uprightly be provided with on the plate 54.In addition, on the end of the base plate 52 of heat absorber 50, be provided with the extension 53 that is used to install thermistor 42 described later.
The heat absorber 50 that FET1～FET6 has been installed is fixed on the electronic unit of control section 70, temperature protection circuit 40 and resistive element etc. and motor power-supply wire have been carried out on the drive circuit substrate 60 of wiring, each splicing ear 58 of source terminal, drain terminal and the gate terminal of FET1～FET6 is electrically connected on the drive circuit substrate 60.
Thermistor 42 is installed on the base plate 52 of the heat absorber 50 of having fixed FET1～FET6, is electrically connected on the temperature protection circuit 40 that has carried out wiring on the drive circuit substrate 60 through holding wire 48.
In such motor driver 10, as shown in Figure 2, accepted the master control part 78 of the input of speed command signal S passes through to make from the pwm signals of pwm circuit 72 to the gate terminal output of each FET1～FET6 of converter circuit 30 rotary speed corresponding with this speed command signal S through logical circuit 74 from the outside, coil 22u, 22v, the 22w that has been connected on each tie point at FET1 and FET2, FET3 and FET4, FET5 and FET6 respectively exports 3 mutually drive currents, makes motor 20 rotations.
3 Hall elements 24,24,24 detect the position of the rotor of this motor rotating 20, to velocity checking circuits 76 outgoing position detection signal K.
In velocity checking circuits 76, calculate the rotary speed of motor 20 and the position of rotor according to position detection signal K from Hall element 24, its result is exported to master control part 78.
In master control part 78, will compare with the speed command signal S that imports from the outside from the present rotary speed of velocity checking circuits 76, by logical circuit 74 is carried out FEEDBACK CONTROL so that this rotary speed becomes the rotary speed corresponding with speed command signal S, motor 20 and the speed command signal S that imports from the outside are rotated accordingly.In addition, if import the motor stop signals from the lead-out terminal 46 of temperature protection circuit 40, then master control part 78 stops the rotation of motor 20.
The work of the temperature protection circuit 40 in the motor driver 10 is described then.
In this temperature protection circuit 40, if the temperature of each FET1～6 of converter circuit 30 rises, then owing to carry out heat exchange with the plate of having installed 54 that uprightly is provided with on each FET1～6, the temperature of heat absorber 50 rises.Then, rise because the thermistor of having installed on base plate 52 42 detects the temperature of heat absorbers 50, the resistance value of thermistor 42 increases, the voltage of lead-out terminal 46 because of the voltage ratio of resistance R 1, R2, thermistor 42 so rise.This voltage rising is exported to the master control part 78 of control section 70 as temperature detection signal T.In master control part 78, because of the event of input temp detection signal T, by to converter circuit 30 output pwm signals the rotation of motor 20 being stopped or its rotary speed being descended, protection converter circuit 30 does not rise its temperature.
As previously discussed, in the motor driver relevant 10 with present embodiment, since with thermistor 42 be installed to can with fixing heat absorber 50 under the state of FET1～FET6 heat exchange on, so except dispersing effectively from the heat that FET1～FET6 produces, holding wire 48 not with the power line adjacency that flows through the drive current of supplying with to motor 20, be difficult to be subjected to The noise.Therefore, can suppress delaying work of temperature protection circuit 40.
In addition, by suitably setting the shape of heat absorber, can freely change the installation site on drive circuit substrate 60 of thermistor 42 and FET1～FET6 etc.
Motor driver of the present invention for example can be used as the drive source of air conditioner, washing machine etc.
Claims (4)
1. motor driver; have the control unit of the converter circuit that constitutes by a plurality of switch elements, the above-mentioned converter circuit of control and protect above-mentioned each switch element of above-mentioned converter circuit to avoid the temperature protection unit that temperature rises, it is characterized in that:
The said temperature protected location has: the temperature detecting unit that detects the temperature of the heat absorber on above-mentioned each switch element that is installed to above-mentioned converter circuit; If with utilize the detected temperature of said temperature detecting unit more than or equal to predetermined temperature then to the output unit of above-mentioned control unit output temperature detection signal,
If the input of said temperature detection signal, then above-mentioned control unit stop the rotation of above-mentioned motor or rotary speed is descended.
2. the motor driver described in claim 1 is characterized in that:
Above-mentioned motor is a brushless DC motor.
3. the motor driver described in claim 1 or 2 is characterized in that:
On above-mentioned heat absorber, be provided for installing the extension of above-mentioned temperature detecting unit.
4. the motor driver described in each of claim 1-3 is characterized in that:
The said temperature detecting unit is a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101024338A CN101304229A (en) | 2007-05-08 | 2007-05-08 | Driving device for electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101024338A CN101304229A (en) | 2007-05-08 | 2007-05-08 | Driving device for electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101304229A true CN101304229A (en) | 2008-11-12 |
Family
ID=40113979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101024338A Pending CN101304229A (en) | 2007-05-08 | 2007-05-08 | Driving device for electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101304229A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789752A (en) * | 2009-01-23 | 2010-07-28 | 日本电产芝浦株式会社 | Control device of electric motor |
| CN103944483A (en) * | 2013-01-22 | 2014-07-23 | 株式会社牧田 | Motor control circuit |
| CN107925378A (en) * | 2015-08-18 | 2018-04-17 | 日本电产伺服有限公司 | Motor unit |
| CN109863688A (en) * | 2016-10-31 | 2019-06-07 | 三菱电机株式会社 | The control method of driving device, air conditioner and compressor |
| CN110868133A (en) * | 2019-11-14 | 2020-03-06 | 维沃移动通信有限公司 | Drive device protection method and electronic equipment |
-
2007
- 2007-05-08 CN CNA2007101024338A patent/CN101304229A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789752A (en) * | 2009-01-23 | 2010-07-28 | 日本电产芝浦株式会社 | Control device of electric motor |
| CN103944483A (en) * | 2013-01-22 | 2014-07-23 | 株式会社牧田 | Motor control circuit |
| CN107925378A (en) * | 2015-08-18 | 2018-04-17 | 日本电产伺服有限公司 | Motor unit |
| CN107925378B (en) * | 2015-08-18 | 2020-12-01 | 日本电产伺服有限公司 | Motor unit |
| CN109863688A (en) * | 2016-10-31 | 2019-06-07 | 三菱电机株式会社 | The control method of driving device, air conditioner and compressor |
| CN110868133A (en) * | 2019-11-14 | 2020-03-06 | 维沃移动通信有限公司 | Drive device protection method and electronic equipment |
| CN110868133B (en) * | 2019-11-14 | 2021-11-12 | 维沃移动通信有限公司 | Drive device protection method and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081112 |