CN104078937A - Motor overheating protection circuit and motor - Google Patents
Motor overheating protection circuit and motor Download PDFInfo
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- CN104078937A CN104078937A CN201310108062.XA CN201310108062A CN104078937A CN 104078937 A CN104078937 A CN 104078937A CN 201310108062 A CN201310108062 A CN 201310108062A CN 104078937 A CN104078937 A CN 104078937A
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Abstract
The invention provides a motor overheating protection circuit which is connected between an AC power source and a motor. The motor overheating protection circuit comprises a radiating fan, a control circuit, a temperature detection circuit, a switch circuit and an AC-DC unit. The AC-DC circuit is connected with the AC power source, and the temperature detection circuit is connected with the AC-DC unit and the switch circuit. The switch circuit is connected with the motor and the radiating fan, and the control circuit is connected with the temperature detection circuit. When the temperature detection circuit detects that the temperature of the motor exceeds a preset temperature, the control circuit controls the AC power source to be disconnected with the motor, and the radiating fan is used for radiating the motor. When the temperature detection circuit detects that the temperature of the motor recovers to be normal, the motor starts to work again, and the radiating fan stops working. The invention further provides the motor. The motor overheating protection circuit is simpler in structure, and using is more convenient.
Description
Technical field
The present invention relates to a kind of overheating protection circuit, relate in particular to a kind of motor protection against overheat circuit and motor.
Background technology
In prior art, motor in the course of the work, because motor heating itself is excessive, easily burns motor winding, brings the not damage of repairing.Overheated in order to prevent motor work, itself is provided with heat abstractor motor, but all more complicated of the circuit structure of these devices are inconvenient to use.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency that above-mentioned prior art exists, and proposes a kind of motor protection against overheat circuit and motor, can solve the circuit structure complexity of the motor of prior art, the problem of being inconvenient to use.
For solving the problems of the technologies described above, the present invention proposes a kind of motor protection against overheat circuit, and it is connected between AC power and motor, and it comprises: radiator fan, for working when the motor overheating, is motor heat dissipation, interchange turns direct current unit, and it comprises first input end, the second input, the first output, exchanges the first input end connection AC power that turns direct current unit, exchanges the second input end grounding that turns direct current unit, for direct voltage is provided, switch element, it comprises first input end, the second input, the first output and the second output, the first input end of switch element connects AC power, the second input connection of switch element exchanges the first output that turns direct current unit, the first output of switch element connects motor, the second output of switch element connects radiator fan, and it turns the conducting between direct current unit and radiator fan, AC power and motor or close for controlling to exchange, temperature detecting unit, it comprises input, the first output, the second output and the 3rd output, the input connection of temperature detecting unit exchanges the first output that turns direct current unit, the 3rd output connection of temperature detecting unit exchanges the second input that turns direct current unit, and it is for detection of the temperature of motor, control unit, it connects temperature detecting unit, the temperature that motor detected when temperature detecting unit exceedes design temperature, the first input end of control unit control switch unit and the first output are closed, the second input and the second output conducting, AC power and motor disconnect, motor quits work, AC power and radiator fan are connected, radiator fan is motor heat dissipation, when detecting the temperature of motor, temperature detecting unit recovers normal, the first input end of control unit control switch unit and the first output conducting, the second input and the second output are closed, AC power and motor conducting, motor is reworked, AC power and radiator fan disconnect, radiator fan quits work.
Preferably, control unit comprises the hot-wire coil of relay, diode, controllable silicon and electric capacity, one end connection of hot-wire coil exchanges the first output that turns direct current unit, the other end of hot-wire coil connects silicon controlled input, silicon controlled output connects the 3rd output of temperature inspection unit, the anodic bonding silicon controlled input of diode, the negative electrode of diode connects one end of hot-wire coil, one end of the second electric capacity connects the negative electrode of diode, the other end of the second electric capacity connects silicon controlled reference edge, the negative electrode of diode connects the first output of temperature detecting unit, silicon controlled reference edge connects the second output of temperature detecting unit, silicon controlled output connects the 3rd output of temperature detecting unit.
Preferably, temperature detecting unit comprises thermistor and divider resistance, and thermistor and divider resistance are connected between the input and the 3rd output of temperature detecting unit successively, and the resistance of thermistor is according to design temperature setting.
Preferably, design temperature is motor maximum operating temperature.
Preferably, switch element comprises the first switch and second switch, the first switch and second switch are all controlled by the hot-wire coil of relay, the first switch of switch element comprises input, the first output and the second output, second switch comprises input and output, the input of the first switch connects AC power, the first output of the first switch connects motor, the input connection of second switch exchanges the output that turns direct current unit, and the output of second switch connects radiator fan.
Preferably, the first switch is normally closed switch, and second switch is normal open switch.
The present invention also proposes a kind of motor, and it comprises motor protection against overheat circuit as above.
Compared with prior art; motor protection against overheat circuit of the present invention and motor; by radiator fan and temperature detecting unit are set; can be in the situation that temperature detecting unit detects motor overheating; control radiator fan is motor heat dissipation; structural design is simple, uses more convenient.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of motor protection against overheat circuit of the present invention.
Description of reference numerals is as follows: control unit 1 hot-wire coil K diode D controllable silicon VT capacitor C temperature detecting unit 2 thermistor R2 divider resistance R3 switch element 3 first K switch 1 second switch K2 exchange and turn direct current unit 4 dropping resistor R1 rectifier BD filter capacitor C1 voltage stabilizing didoe D1 radiator fan M1 motor M.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
Refer to Fig. 1, motor protection against overheat circuit of the present invention, it is connected between AC power and motor M, and it comprises: radiator fan M1, control unit 1, temperature detecting unit 2, switch element 3 and interchange turn direct current unit 4.
Interchange turns direct current unit 4 and comprises: first input end, the second input, the first output.Switch element 3 comprises: first input end, the second input, the first output and the second output.Temperature detecting unit 2 comprises: input, the first output, the second output and the 3rd output.
The first input end that interchange turns direct current unit 4 connects AC power, exchanges the second input end grounding that turns direct current unit 4.The input connection of temperature detecting unit 2 exchanges the first output that turns direct current unit 4, and the 3rd output connection of temperature detecting unit 2 exchanges the second input that turns direct current unit 4.The first input end of switch element 3 connects AC power, and the second input connection of switch element 3 exchanges the first output that turns direct current unit 4, and the first output of switch element 3 connects motor M, and the second output of switch element 3 connects radiator fan M1.Control unit 1 connects temperature detecting unit 2.
Radiator fan M1, for work in the time that motor M is overheated, is motor M heat radiation.Interchange turns direct current unit 4 for direct voltage is provided.Switch element 3 turns the conducting between direct current unit 4 and radiator fan M1, AC power and motor M or closes for controlling to exchange.Temperature detecting unit 2 is for detection of the temperature of motor M.
The temperature that motor M detected when temperature detecting unit 2 exceedes design temperature, the second input of control unit 1 control switch unit 3 and the second output conducting, first input end and the first output are closed, AC power and motor M disconnect, motor M quits work, AC power and radiator fan M1 connect, radiator fan M1 is motor M heat radiation, when detecting the temperature of motor M, temperature detecting unit 2 recovers normal, the first input end of control unit 1 control switch unit 3 and the first output conducting, the second input and the second output are closed, AC power and motor M conducting, motor M reworks, AC power and radiator fan M1 disconnect, radiator fan M1 quits work.
Control unit 1 comprises hot-wire coil K, diode D, controllable silicon VT and the capacitor C of relay.One end connection of hot-wire coil K exchanges the first output that turns direct current unit 4, the other end of hot-wire coil K connects the input of controllable silicon VT, the output of controllable silicon VT connects the 3rd output of temperature inspection unit, the input of the anodic bonding controllable silicon VT of diode D, the negative electrode of diode D connects one end of hot-wire coil K, one end of the second capacitor C connects the negative electrode of diode D, the other end of the second capacitor C connects the reference edge of controllable silicon VT, the negative electrode of diode D connects the first output of temperature detecting unit 2, the reference edge of controllable silicon VT connects the second output of temperature detecting unit 2, the output of controllable silicon VT connects the 3rd output of temperature detecting unit 2.
Temperature detecting unit 2 comprises thermistor R2 and divider resistance R3.Thermistor R2 and divider resistance R3 are connected between the input and the 3rd output of temperature detecting unit 2 successively, and the resistance of thermistor R2 is according to design temperature setting.In the present embodiment, design temperature is motor M maximum operating temperature.
Switch element 3 comprises the first K switch 1 and second switch K2.The first K switch 1 and second switch K2 are all controlled by the hot-wire coil K of relay.The first K switch 1 of switch element 3 comprises input, the first output and the second output, and second switch K2 comprises input and output.The input of the first K switch 1 connects AC power, and the first output of the first K switch 1 connects motor M, and the input connection of second switch K2 exchanges the first output that turns direct current unit 4, and the output of second switch K2 connects radiator fan M1.In the present embodiment, the first switch is normally closed switch, and second switch is normal open switch.
Interchange turns direct current unit 4 and comprises dropping resistor R1, rectifier BD, filter capacitor C1 and voltage stabilizing didoe D1.Between the pin one of rectifier BD and AC power, be connected with dropping resistor R1, pin 3 ground connection of rectifier BD, are connected with filter capacitor C1 between the pin two of rectifier BD and pin 4, and voltage stabilizing didoe D1 is in parallel with filter capacitor C1.The pin one connection of rectifier BD exchanges the first input end that turns direct current unit 4, the pin 4 of rectifier BD is for exchanging the second input that turns direct current unit 4, the pin two of rectifier BD is to exchange the first output that turns direct current unit 4, and the pin 3 of rectifier BD is for exchanging the second output that turns direct current unit 4.
The present invention also proposes a kind of motor M, comprises above-mentioned motor protection against overheat circuit.
Describe operation principle of the present invention in detail below in conjunction with Fig. 1.
AC power is by dropping resistor R1 step-down, rectifier bridge rectification, and filter capacitor C1 filtering, voltage stabilizing didoe D1 voltage stabilizing, for hot-wire coil K, controllable silicon VT and the radiator fan M1 of the relay of rear class provide direct voltage.
Thermistor R2 sets the maximum operating temperature of motor M, and in the time that temperature is normal, thermistor R2 resistance is larger, and divider resistance R3 both end voltage can not make controllable silicon VT conducting, now not adhesive of relay, and motor M normally works.
When temperature raises; thermistor R2 resistance declines; in the time that temperature is elevated to protection point; divider resistance R3 both end voltage makes controllable silicon VT conducting; thereby relay obtains electric adhesive, the first K switch 1 adhesive, makes motor M power-off quit work; second switch K2 adhesive makes radiator fan M1 obtain electric work, is motor M heat radiation.After having dispelled the heat, controllable silicon VT cut-off, relay power-off disconnects the first K switch 1 and second switch K2, and motor M is reworked, and radiator fan M1 quits work.
Compared with prior art; motor protection against overheat circuit of the present invention and motor; by radiator fan and temperature detecting unit are set; can be in the situation that temperature detecting unit detects motor overheating; control radiator fan is motor heat dissipation; structural design is simple, uses more convenient.
The foregoing is only better possible embodiments of the present invention, not limit the scope of the invention.The equivalent structure that all utilizations specification of the present invention and accompanying drawing content have been done changes, and is all included in protection scope of the present invention.
Claims (7)
1. a motor protection against overheat circuit, it is connected between AC power and motor, it is characterized in that, and it comprises:
Radiator fan, for working when the described motor overheating, is described motor heat dissipation;
Interchange turns direct current unit, and it comprises first input end, the second input, the first output, and the first input end that described interchange turns direct current unit connects described AC power, and described interchange turns the second input end grounding of direct current unit, for direct voltage is provided;
Switch element, it comprises first input end, the second input, the first output and the second output, the first input end of described switch element connects described AC power, the second input of described switch element connects described interchange and turns the first output of direct current unit, the first output of described switch element connects described motor, the second output of described switch element connects described radiator fan, and it turns the conducting between direct current unit and described radiator fan, described AC power and described motor or close for controlling described interchange;
Temperature detecting unit, it comprises input, the first output, the second output and the 3rd output, the input of described temperature detecting unit connects described interchange and turns the first output of direct current unit, the 3rd output of described temperature detecting unit connects described interchange and turns the second input of direct current unit, and it is for detection of the temperature of described motor;
Control unit, it connects described temperature detecting unit, the temperature that described motor detected when described temperature detecting unit exceedes design temperature, described in described control unit control, first input end and first output of switch element closed, the second input and the second output conducting, described AC power and described motor disconnect, described motor quits work, described AC power and described radiator fan are connected, described radiator fan is described motor heat dissipation, when detecting the temperature of described motor, described temperature detecting unit recovers normal, the first input end of switch element and the first output conducting described in described control unit control, the second input and the second output are closed, described AC power and described motor conducting, described motor is reworked, described AC power and described radiator fan disconnect, described radiator fan quits work.
2. motor protection against overheat circuit as claimed in claim 1, it is characterized in that, described control unit comprises the hot-wire coil of relay, diode, controllable silicon and electric capacity, one end of described hot-wire coil connects described interchange and turns the first output of direct current unit, the other end of described hot-wire coil connects described silicon controlled input, described silicon controlled output connects the 3rd output of described temperature inspection unit, silicon controlled input described in the anodic bonding of described diode, the negative electrode of described diode connects one end of described hot-wire coil, one end of described the second electric capacity connects the negative electrode of described diode, the other end of described the second electric capacity connects described silicon controlled reference edge, the negative electrode of described diode connects the first output of described temperature detecting unit, described silicon controlled reference edge connects the second output of described temperature detecting unit, described silicon controlled output connects the 3rd output of described temperature detecting unit.
3. motor protection against overheat circuit as claimed in claim 1; it is characterized in that; described temperature detecting unit comprises thermistor and divider resistance; described thermistor and divider resistance are connected between the input and the 3rd output of described temperature detecting unit successively, and the resistance of described thermistor is according to described design temperature setting.
4. motor protection against overheat circuit as claimed in claim 3, is characterized in that, described design temperature is described motor maximum operating temperature.
5. motor protection against overheat circuit as claimed in claim 1, it is characterized in that, described switch element comprises the first switch and second switch, described the first switch and second switch are all controlled by the hot-wire coil of described relay, the first switch of described switch element comprises input, the first output and the second output, described second switch comprises input and output, the input of described the first switch connects described AC power, the first output of described the first switch connects described motor, the second output sky of described the first switch connects, the input of described second switch connects described interchange and turns the output of direct current unit, the output of described second switch connects radiator fan.
6. motor protection against overheat circuit as claimed in claim 5, is characterized in that, described the first switch is normally closed switch, and described second switch is normal open switch.
7. a motor, is characterized in that, it comprises the motor protection against overheat circuit as described in claim 1 to 6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310108062.XA CN104078937A (en) | 2013-03-29 | 2013-03-29 | Motor overheating protection circuit and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310108062.XA CN104078937A (en) | 2013-03-29 | 2013-03-29 | Motor overheating protection circuit and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104078937A true CN104078937A (en) | 2014-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310108062.XA Pending CN104078937A (en) | 2013-03-29 | 2013-03-29 | Motor overheating protection circuit and motor |
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| CN (1) | CN104078937A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947683A (en) * | 2017-11-17 | 2018-04-20 | 李继前 | Control circuit, hair dryer and modality based on motor |
-
2013
- 2013-03-29 CN CN201310108062.XA patent/CN104078937A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947683A (en) * | 2017-11-17 | 2018-04-20 | 李继前 | Control circuit, hair dryer and modality based on motor |
| CN107947683B (en) * | 2017-11-17 | 2020-05-08 | 李继前 | Control circuit, hairdryer and physiotherapy equipment based on motor |
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Application publication date: 20141001 |
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