CN1208855A - Device for alarming and indicating rotating speed of electric motor - Google Patents
Device for alarming and indicating rotating speed of electric motor Download PDFInfo
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- CN1208855A CN1208855A CN97116373A CN97116373A CN1208855A CN 1208855 A CN1208855 A CN 1208855A CN 97116373 A CN97116373 A CN 97116373A CN 97116373 A CN97116373 A CN 97116373A CN 1208855 A CN1208855 A CN 1208855A
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- rotating speed
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Abstract
The motor revolution speed warning device includes: a conversion unit, electrically-connected with a motor, used for converting actual revolution speed signal of the motor into an analogue voltage value; a reference unit, used for providing an analogue reference rated voltage value corresponding to the actual revolution speed of the motor; a comparision unit, used for comparing the analogue voltage value converted and outputted by conversion unit with the reference rated voltage value set by analogue reference unit; and an output unit, electrically-connected with comparision unit, when the analogue voltage value of actual revolution speed of the motor is less than or greater than its analogue reference rated voltage value, it can output a warning signal to prevent the system from producing failure.
Description
The present invention is relevant for a kind of device for alarming and indicating rotating speed of electric motor, especially refer to a kind of by the rotating speed that detects motor, when motor speed is too high or too low, instant output one alarm signal (ALARM), the present motor of reporting system can't normal operation or efficiently radiates heat, make system take counter-measure, burn or fault to avoid system.
The general at present function of the built-in fan motor device for alarming and indicating rotating speed of system commonly used on the market, all only after fan stops fully, just have alarm signal output with reporting system, thereby when fan is influenced by external force or other factors, cause the too high or rotation speed of the fan of rotation speed of the fan to reduce gradually and there is no alarm signal output when not stopping fully, and during this period, the radiating efficiency of fan is extremely low, not only cause the heat dissipation problem of system, and do not have the alarm signal reporting system, will cause system to be burnt or fault at last.
For comparing the difference of this case and known fan motor device for alarming and indicating rotating speed, please refer to Fig. 1, this figure is the circuit block diagram of known fan motor device for alarming and indicating rotating speed, and it comprises: a DC fan 1, a fan stop detector 2, one drive circuit (Drive IC) 3 and one output circuit 4; When fan stop detector 2 detects DC fan 1 and stops fully, promptly export a signal and give driving circuit 3 to drive output circuit 4 outputs one alarm signal, the present DC fan 1 of reporting system stops fully, there has not been heat sinking function, make system take emergency measure, but this kind fan motor device for alarming and indicating rotating speed is when being influenced by external force or other factors, though may cause the too high or rotation speed of the fan of DC fan 1 rotating speed to reduce gradually but do not stop fully and do not have alarm signal output, during this period, this DC fan radiating efficiency is extremely low, the system radiating problem is not only arranged,, will cause system to be burnt or fault at last again because of no alarm signal reporting system.
The objective of the invention is to solve when motor speed when too high or rotating speed is not enough, make motor in the time can't reaching efficiently radiates heat effect or normal operation, system itself can promptly protect, and reason is overheated and burn or the alarming device of fault to make system itself.
For achieving the above object, the present invention takes following scheme:
The device for alarming and indicating rotating speed of electric motor of this case comprises: a converting unit, and this converting unit is electrically connected on a motor, in order to motor actual speed conversion of signals is become a magnitude of voltage; One reference unit, this reference unit in order to provide corresponding to the motor actual speed one with reference to load voltage value; One comparing unit, comparing unit is in order to the analog voltage of relatively output that converting unit is changed and the analog references load voltage value that this reference unit sets; And an output unit, this output unit is electrically connected on comparing unit, when motor actual speed analog voltage less than or during greater than the analog references load voltage value, export an alarm signal (ALARM) with caution system.
Wherein motor can be a DC fan (DC FAN) motor or a motor drive, and dc fan motor or motor drive also can be one and vary with temperature and change the dc fan motor of rotating speed or motor drive (this moment, the analog references load voltage value of this reference circuit also can become with temperature), and wherein the actual speed signal of this dc fan motor or motor drive is a digital square-wave.
Wherein this converting unit is to can be a change-over circuit, and this change-over circuit is converted to an analog voltage signal in order to the digital square-wave with the motor actual speed.
Wherein reference unit can be a reference circuit, and in order to a default analog references load voltage value of comparing with this voltage signal to be provided, and wherein this analog references load voltage value also can vary with temperature and change.
Wherein comparing unit can be a comparator circuit, in order to analog voltage signal and the default analog references load voltage value that compares the motor actual speed, and exports a compare result signal.
Wherein motor actual speed analog voltage less than or during greater than the analog references load voltage value; comparator circuit inputs to output circuit with compare result signal and produces a caution system makes the strain safeguard measure, the detection when reducing gradually not stop fully as motor speed.
Wherein when motor actual speed magnitude of voltage is greater than or less than with reference to load voltage value; comparator circuit inputs to output circuit with compare result signal and produces an alarm signal makes the strain safeguard measure with caution system, with as when the too high detection of motor speed.
Be simply described as follows by following drawings and Examples:
Fig. 1: known fan motor device for alarming and indicating rotating speed circuit block diagram;
Fig. 2: device for alarming and indicating rotating speed of electric motor circuit block diagram of the present invention.
Please refer to Fig. 2, this figure is a device for alarming and indicating rotating speed of electric motor circuit block diagram of the present invention, and it comprises: a motor 21, a change-over circuit 22, a reference circuit 23, a comparator circuit 24 and an output circuit 25.
By among the figure as can be known, the digital square-wave of motor 21 actual speed converts an analog voltage to through change-over circuit 22, this analog voltage is compared by comparator circuit 24 with the analog references load voltage value of reference circuit 23 again, then makes output circuit 25 output one alarm signal (ALARM) reporting systems make emergency measure if analog voltage is lower than the analog references load voltage value.Certainly, conception of the present invention also can be used on the detection when too high of the rotating speed of motor 21, promptly, analog voltage then make output circuit 25 outputs one alarm signal reporting system make emergency measure when being higher than the analog references load voltage value, the present invention simultaneously also can use the motor 21 that changes rotating speed with temperature, and the analog references ratings of reference circuit also varies with temperature at this moment, that is this case also can be exported an alarm signal reporting system in good time and do strain with variation of ambient temperature.
The present invention has following effect in sum:
The present invention be improve known must below the situation that motor does not turn to fully, have alarm signal output with The shortcoming of reporting system, and can set motor when being below or above how many rotating speeds, namely there is alarm signal defeated Go out, motor system in the time can't reaching the efficiently radiates heat effect or run well also can be known, and immediately take Safeguard measure avoids system to burn or fault.
Claims (10)
1, a kind of device for alarming and indicating rotating speed of electric motor comprises:
One converting unit, it is electrically connected on a motor, in order to motor actual speed conversion of signals is become an analog voltage;
One reference unit, it is in order to provide the analog references load voltage value corresponding to the motor actual speed;
One comparing unit, it is in order to the analog voltage of relatively output that converting unit is changed and the reference load voltage value that the analog references unit sets; And
One output unit is electrically connected on comparing unit, when the analog voltage of motor actual speed less than or during greater than the analog references load voltage value, export an alarm signal.
2, device for alarming and indicating rotating speed of electric motor according to claim 1 is characterized in that, described motor is a DC fan motor.
3, device for alarming and indicating rotating speed of electric motor according to claim 1 is characterized in that, described motor is one to vary with temperature the motor that changes rotating speed.
4, alarming and indicating rotating speed of electric motor according to claim 1 is characterized in that, the actual speed signal of described motor is a digital square-wave.
According to claim 1 or 4 described device for alarming and indicating rotating speed of electric motor, it is characterized in that 5, described converting unit is a change-over circuit, change-over circuit is converted to analog voltage in order to the digital square-wave with actual speed.
6, device for alarming and indicating rotating speed of electric motor according to claim 1 is characterized in that, described reference unit is a reference circuit, in order to a default analog references load voltage value of comparing with analog voltage to be provided.
According to claim 1 or 6 described device for alarming and indicating rotating speed of electric motor, it is characterized in that 7, described analog references load voltage value varies with temperature.
8, device for alarming and indicating rotating speed of electric motor according to claim 1 is characterized in that, described comparing unit is a comparator circuit, reaches default analog references load voltage value in order to compare motor actual speed analog voltage, and exports a compare result signal.
9, according to claim 1 or 8 described device for alarming and indicating rotating speed of electric motor, it is characterized in that, the magnitude of voltage of described motor actual speed less than or during greater than the analog references load voltage value, comparator circuit inputs to compare result signal output circuit and produces an alarm signal.
10, according to claim 1 or 8 described device for alarming and indicating rotating speed of electric motor, it is characterized in that, when the analog voltage of described motor actual speed was greater than or less than the analog references load voltage value, described comparator circuit inputed to compare result signal described output circuit and produces an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116373A CN1088521C (en) | 1997-08-18 | 1997-08-18 | Device for alarming and indicating rotating speed of electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116373A CN1088521C (en) | 1997-08-18 | 1997-08-18 | Device for alarming and indicating rotating speed of electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1208855A true CN1208855A (en) | 1999-02-24 |
| CN1088521C CN1088521C (en) | 2002-07-31 |
Family
ID=5173806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116373A Expired - Lifetime CN1088521C (en) | 1997-08-18 | 1997-08-18 | Device for alarming and indicating rotating speed of electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1088521C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417002C (en) * | 2005-08-11 | 2008-09-03 | 台达电子工业股份有限公司 | Drive device of fan moter |
| CN103983802A (en) * | 2014-04-08 | 2014-08-13 | 潍柴动力股份有限公司 | Signal processing method and device |
| CN110646633A (en) * | 2019-06-06 | 2020-01-03 | 武汉纺织大学 | Speed detection system and speed detection method for alternating current winding motor |
| CN111173765A (en) * | 2018-11-13 | 2020-05-19 | 技嘉科技股份有限公司 | Fan diagnostic circuit |
-
1997
- 1997-08-18 CN CN97116373A patent/CN1088521C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417002C (en) * | 2005-08-11 | 2008-09-03 | 台达电子工业股份有限公司 | Drive device of fan moter |
| CN103983802A (en) * | 2014-04-08 | 2014-08-13 | 潍柴动力股份有限公司 | Signal processing method and device |
| CN111173765A (en) * | 2018-11-13 | 2020-05-19 | 技嘉科技股份有限公司 | Fan diagnostic circuit |
| CN110646633A (en) * | 2019-06-06 | 2020-01-03 | 武汉纺织大学 | Speed detection system and speed detection method for alternating current winding motor |
| CN110646633B (en) * | 2019-06-06 | 2021-11-30 | 武汉纺织大学 | Speed detection system and speed detection method for alternating current winding motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1088521C (en) | 2002-07-31 |
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Granted publication date: 20020731 |
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| CX01 | Expiry of patent term |