CN100388584C - Protection circuit for electric motor - Google Patents
Protection circuit for electric motor Download PDFInfo
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- CN100388584C CN100388584C CNB2004100405254A CN200410040525A CN100388584C CN 100388584 C CN100388584 C CN 100388584C CN B2004100405254 A CNB2004100405254 A CN B2004100405254A CN 200410040525 A CN200410040525 A CN 200410040525A CN 100388584 C CN100388584 C CN 100388584C
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- circuit
- control signal
- motor
- relay
- resistance
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Abstract
The present invention relates to a protection circuit for a motor, which comprises a sample circuit, rectification circuits, a time delay circuit, a comparison circuit and a control circuit, wherein the sample circuit uses current variation of a power supply circuit of the motor as control signals, and then, the control signals is divided into two paths so as to be transmitted to the two rectification circuits; the control signal outputted by one path of rectification circuit is delayed and is inputted to the same comparison circuit with through connect signals outputted by the other path of the rectification circuit, and the control signal is outputted by the comparison circuit so as to switch on or switch off the power supply circuit of the motor. The present invention has the advantages of simple circuitous philosophy, reliable performance and low manufacture cost, and the present invention is suitable for a single-phase and a three-phase AC motors and DC motors.
Description
Technical field
The present invention relates to a kind of motor protecting circuit, particularly a kind of avoid motor energising after, can not rotate the accident of burning motor winding owing to rotor.
Background technology
At present, in the prior art, the protection of motor is had thermal relay, automatic switch, universal current limiting circuit breaker and integrated protector for electric motor etc., but all structure is complicated mostly, cost of manufacture is higher, and can not protect DC motor etc.For example a kind of BHQ (JD-5/5D-6) motor protector just can only have protective effect to three-phase alternating-current motor, and single-phase AC motor and DC motor are not played protective effect.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of circuit simple, applicable to the motor protecting circuit of polytype motor protection requirement.
For achieving the above object, motor protecting circuit of the present invention comprises: sample circuit, current rectifying and wave filtering circuit, delay circuit, comparison circuit, control circuit;
Sample circuit utilize motor in the moment, its starting current of starting the big principle of operating current when running well, pick up the control signal that a voltage changes from high to low; Equally, motor because external force forces the rotor stall, will make operating current moment increase when running well, and sample circuit will pick up the variable quantity of a voltage rising as control signal.Described control signal is transferred to two current rectifying and wave filtering circuits respectively, the control signal of one of them rectification circuit output through delay circuit time-delay back and another rectification circuit directly output without the control signal of delaying time, be input to same comparison circuit simultaneously.In starting process, the motor to be monitored supply line electric current that sample circuit monitors has variation from high to low as motor, and then comparison circuit just has a signal and outputs to control circuit, and then motor supply line will be switched on; Otherwise the not variation of motor supply line's electric current to be monitored that sample circuit monitors, then not output of comparison circuit, control circuit will disconnect the motor power supply circuits.Can not rotate as motor rotor when the operate as normal suddenly, sample circuit monitors motor supply line electric current to be monitored will sharply become big, comparison circuit will be exported a signal to control circuit, is gone to control the disconnection of motor power supply circuits by control circuit.
Purpose of the present invention, feature and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Description of drawings
Fig. 1 represents the block diagram of motor protecting circuit of the present invention.
Fig. 2 represents the circuit structure diagram of first kind of embodiment of motor protecting circuit of the present invention.
Fig. 3 represents the circuit structure diagram of second kind of embodiment of motor protecting circuit of the present invention.
Fig. 4 represents the circuit structure diagram of sample circuit of the third embodiment of motor protecting circuit of the present invention.
Embodiment
As Fig. 2 or motor protecting circuit shown in Figure 3, during electronic function operate as normal, in the moment of starting, will on sample circuit 1, produce a voltage control signal that changes from high to low, (described control signal can be regulated its amplitude by adjustable resistance 19, to adapt to the job requirement of late-class circuit) this signal divides two-way, be transferred to first rectification circuit 2 and second rectification circuit 3 (rectification circuit can be selected the rectifier diode of a low pressure drop for use) respectively, first rectification circuit, 2 outputs, one first electric capacity 4 in parallel, first electric capacity 4 has two effects herein, one is the filter capacitor of control signal, and it two is and first resistance 6 is formed RC first delay circuit 20; Second rectification circuit, 3 outputs are parallel with a filtering second electric capacity 5 and a load resistance 7 respectively.
As Fig. 2 or shown in Figure 3, the first transistor 11 of comparison circuit can be selected a NPN transistor for use, it has base stage, emitter and collector, its base stage receives the control signal from first delay circuit 20, emitter receives the control signal that directly transmits from second rectification circuit 3, and meets power supply V by load resistance 7
+Negative pole (power supply V
+Negative pole and the negative pole of sample circuit 1 control signal of picking up be same earth terminal), its collector electrode is by the J of control circuit 15
1The coil of relay is by the J of control circuit 15
2The J of relay
2-1Normally-closed contact connects power supply V
+(pass through the J of control circuit 15 by the collector electrode of its first transistor 11 as can be known shown in Figure 2
1The coil of relay directly connects power supply V
+).
By Fig. 2 or as can be known shown in Figure 3, second resistance 14 of control circuit 15 connects the anode of the 3rd electric capacity 13, and the negative terminal of the 3rd electric capacity 13 is through J
3The coil ground connection of relay is when giving this circuit energized V
+The time, J in the 3rd electric capacity 13 charging processes
3The coil of relay has electric current to flow through, then J
3The normally opened contact J of relay
3The power supply circuits of motor 17 are connected in adhesive.This moment is if motor 17 can normal startings, moment of starting then sample circuit 1 will obtain a voltage control signal that changes from high to low, then first rectification circuit 2 and second rectification circuit 3 all will be exported a voltage control signal of variation from high to low.Because the control signal of first rectification circuit, 2 outputs is the base stages that are transferred to the first transistor 11 through first delay circuit 20, and the control signal of second rectification circuit, 3 outputs is not have time-delay directly to be transferred to the emitter of the first transistor 11, therefore the voltage of the first transistor 11 base stages will be higher than the voltage of its emitter in the voltage decline process of control signal, 11 conductings of the first transistor, the J of the first transistor 11 collector electrodes
1Relay coil has electric current to flow through, its J
1Three normally opened contact J of relay
1-1, J
1-2, J
1-3With adhesive, this moment contact J
1-1Will be directly J
1The negativing ending grounding of relay coil, contact J
1-2With J
3The direct energize V of relay coil anode
+, give its J
3The relay coil continued power, J
3The normally opened contact J of relay
3To continue closure, give motor 17 continued powers.Otherwise if motor 17 can not normal starting, then the control signal magnitude of voltage that obtains on the sample circuit 1 will not change, the then not variation of control signal magnitude of voltage of first rectification circuit 2 and 3 outputs of second rectification circuit, and then the first transistor 11 is remain off, then J
1Three contact J of relay
1-1, J
1-2, J
1-3To keep separated position, after the 3rd electric capacity 13 is full of electric charge, J
3The normally opened contact J of relay
3To separate, disconnect the power supply circuits of motor 17.
As shown in Figure 2 as can be known, when at the motor 17 that runs well because when being subjected to external force to make its rotor stall, sample circuit 1 will obtain a control signal that changes from low to high, will divide two-way to be transferred to first rectification circuit 2 and second rectification circuit 3; The control signal of first rectification circuit, 2 outputs is transferred to second delay circuit 21, and (positive pole of the 3rd resistance 8 and the 4th electric capacity 9 is connected the back and constitutes second delay circuit 21, and be parallel to the output of first rectification circuit 2, because control signal needs a period of time when the 3rd resistance 8 is given 9 chargings of the 4th electric capacity, then this RC time constant has just been served as the delay time of second delay circuit 21), the transistor seconds 12 of comparison circuit can be selected a NPN transistor for use, it has base stage, emitter and collector, its emitter receives the control signal from second delay circuit 21, and the control signal of second rectification circuit, 3 outputs is through described J
1The normally opened contact J of relay
1-3Be transferred to the base stage of the transistor seconds 12 of comparison circuit by current-limiting resistance 10, its collector electrode is by the J of control circuit 15
2The coil switch power V of relay
+Because the control signal of transistor seconds 12 emitters receipts is slower than its base stage through time-delay so voltage rises, when the voltage difference of be knot arrives to a certain degree greatly, then transistor seconds 12 conductings, its described J
2Relay coil has electric current to flow through, then J
2The normally-closed contact J of relay
2-1Separate normally opened contact J
2-2Closure, the J of control circuit 15 at this moment
1Three normally opened contacts of relay all will separate, and cause J
3The normally opened contact J of relay
3Separate immediately, the supply line of motor will be disconnected, simultaneously J
2-2Power connection with alarm 16.
As Fig. 2 or shown in Figure 3, the first protection diode 18 is the protective circuit that the be of the first transistor 11 of comparison circuit ties, and the second protection diode 24 is the protective circuit that the be of the transistor seconds 12 of comparison circuit ties.
As Fig. 2 or shown in Figure 3, sample circuit 1 can be the high-power resistance that is connected in the power supply lines of motor 17, is characterized in and can uses in the AC electrical machine circuit, can also use in the circuit of DC motor simultaneously; Sample circuit 1 also can be the inductance coil of ring set in motor 17 current supply line peripheries, is characterized in long and energy efficient of life-span.
Be the schematic diagram of the sample circuit of threephase motor as shown in Figure 4, it is at A, B, on three phase line peripheries of C respectively ring set 1-a is arranged, 1-b, three inductance coils of 1-c, with the end of the same name of three inductance coils common ground that links together, three ends in addition of three coils are connected respectively to three diodes 21,22,23 positive pole, and with described three diodes 21,22 and 23 negative pole links together and does with some output, the circuit of comprehensive above-described components and parts and connection thereof constitutes sample circuit 1, and the sample circuit 1 with single-phase motor equally will be divided into two-way, give first rectification circuit 2 and second rectification circuit, 3 transmission of control signals respectively.
In the present invention, the use of components and parts and the structure of partial circuit never only only limit to case cited in the embodiment, as the transistor of comparison circuit, can be to use a transistor, also can use Darlington circuit by two transistor combinations; And for example the relay of control circuit part can use traditional electromagnetic relay, also can use solid state relay, electronic switch etc.; Can diode 25 in parallel on second resistance 14, so that the J that is selecting for use
3When the coil internal resistance of relay was big, diode 25 can fall 14 short circuits of second resistance.In a word, protection scope of the present invention should comprise those conspicuous to those skilled in the art conversion or substitute and remodeling.
Claims (10)
1. motor protecting circuit device, the operating current that picks up motor supply line is as control signal, it is characterized in that: sample circuit (1) converts the current change quantity of circuit to be monitored to voltage variety, is transferred to first rectification circuit (2) and second rectification circuit (3) then respectively; Voltage control signal through first rectification circuit (2) output is transferred to delay circuit (20), and this delay circuit is made of first electric capacity (4) and first resistance (6); It has base stage, emitter and collector the transistor of comparison circuit (11), the voltage control signal of second rectification circuit (3) output, after second electric capacity (5) filtering, transfer to comparison circuit transistor (11) emitter and constitute electric loop by load resistance (7), the collector electrode of described transistor (11) passes through relay J
1Coil connect power supply V
+, its base stage receives the control signal from delay circuit (20); Described power supply V
+Negative pole and the negative pole of the described sample circuit control signal of picking up be same earth terminal; Described relay J
1Normally opened contact J
1-1Be connected across collector electrode and its power supply V of described transistor (11)
+Between the negative pole; By second resistance (14), the 3rd electric capacity (13), relay J
3The delay circuit formed of coil insert power supply V+, described relay J
1Normally opened contact J
1-2Be connected in parallel on the two ends of second resistance (14) and the 3rd electric capacity (13) of series connection; Described relay J
3Normally opened contact J
3Be connected in the supply line of motor (17).
2. motor protecting circuit, with the operating current that picks up motor supply line as control signal, it is characterized in that: sample circuit (1) converts the current change quantity of circuit to be monitored to voltage variety as control signal, divides two-way to transfer to first rectification circuit (2) and second rectification circuit (3) respectively then;
Divide two-way to transfer to respectively through the control signal of first rectification circuit (2) output and constitute second delay circuit (1) by first delay circuit (20) of first electric capacity (4), first resistance (6) formation with by the 3rd resistance (8), the 4th electric capacity (9);
After the voltage control signal of second rectification circuit (3) output is by second electric capacity (5) filtering, constitute electric loop by load resistance (7);
It has base stage, emitter and collector the first transistor of comparison circuit (11), its base stage receives the control signal from first delay circuit (20), its emission receives the control signal from second rectification circuit (3) output, and by its load resistance (7) ground connection, its collector electrode is by the J of control circuit (15)
1The coil of relay is again by the J of control circuit (15)
2The normally-closed contact J of relay
2-1Connect power supply V
+
The transistor seconds of comparison circuit (12), it has base stage, collector and emitter, and its base stage is by the current-limiting resistance (10) of series connection successively and the J of control circuit (15)
1The normally opened contact J of relay
1-3, receive control signal from second rectification circuit (3) output, its collector electrode is by described J
2The coil of relay and power supply V
+Connect, its emitter receives the control signal after second delay circuit (1) time-delay;
Described power supply V
+Negative pole and the negative pole of the described sample circuit control signal of picking up be same earth terminal;
Power supply V
+By J by second resistance (14), the 3rd electric capacity (13), control circuit (15)
3The coil of relay and power cathode constitute loop, described J
1The normally opened contact J of relay
1-2Be connected in parallel on the two ends of second resistance (14) and the 3rd electric capacity (13) of series connection;
Described relay J
1Normally opened contact J
1-1Be connected across between the collector electrode and its ground of described the first transistor (11);
Described relay J
3Normally opened contact J
3Be connected in series in the supply line of controlled motor (17) break-make of control motor (17) power circuit.
3. motor protecting circuit according to claim 2 is characterized in that: described relay J
2Normally opened contact J
2-2Warning circuit (16) is inserted in the power supply road of controlled motor (17).
4. motor protecting circuit according to claim 2 is characterized in that: described sample circuit (1) is a high-power resistance in the power supply lines that is connected on controlled motor (17).
5. motor protecting circuit according to claim 2 is characterized in that: described sample circuit (1) is the induction coil of a ring set in the power supply current supply line periphery of controlled motor (17).
6. motor protecting circuit according to claim 2; it is characterized in that: the be knot of the first transistor of described comparison circuit (11) is parallel with the first protection diode (18), and the be knot of the transistor seconds of described comparison circuit (12) is parallel with the second protection diode (24).
7. motor protecting circuit according to claim 2 is characterized in that: the transistor seconds (12) of transistor of described comparison circuit (11) and comparison circuit is a NPN transistor.
8. motor protecting circuit according to claim 2, it is characterized in that: described first delay circuit (20) is the output that is connected in parallel on first rectification circuit (2) by first electric capacity (4), and required discharge time constant is a delay time when first electric capacity (4) that is filled with electric charge discharges by first resistance (6); Second delay circuit (1) is made of the 3rd resistance (8) and the 4th electric capacity (9), when the voltage control signal of first rectification circuit (2) output, required charge constant is a delay time when the 3rd resistance (8) is given the 4th electric capacity (9) charging.
9. motor protecting circuit according to claim 2; it is characterized in that: described sample circuit (1) is given first rectification circuit (2) and second rectification circuit (3) transmission of control signals respectively through the adjustable resistance (16) of series connection, to adapt to the amplitude of the control signal that meets back polar circuit job requirement.
10. motor protecting circuit according to claim 2; it is characterized in that: described sample circuit (1) is three inductance coils of difference ring set (1-a, 1-b, 1-c) on three power supplies of A, B, the C of threephase motor power supply phase line periphery; its three ends of the same name are linked together connect same ground jointly; other three ends are connected respectively to the anode of three diodes (21,22,23), and the negative terminal of three diodes (21,22,23) links together the branch two-way to first rectification circuit (2) and second rectification circuit (3) transmission of control signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100405254A CN100388584C (en) | 2004-08-25 | 2004-08-25 | Protection circuit for electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100405254A CN100388584C (en) | 2004-08-25 | 2004-08-25 | Protection circuit for electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1599179A CN1599179A (en) | 2005-03-23 |
| CN100388584C true CN100388584C (en) | 2008-05-14 |
Family
ID=34664693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100405254A Expired - Fee Related CN100388584C (en) | 2004-08-25 | 2004-08-25 | Protection circuit for electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100388584C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656501B (en) * | 2008-08-20 | 2012-02-01 | 田永茂 | Motor starting circuit |
| CN101752948B (en) * | 2008-12-19 | 2015-01-07 | 台达电子工业股份有限公司 | Detection and protection device for motor anomalies and method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87202183U (en) * | 1987-02-19 | 1987-10-14 | 锦州市机电研究所 | Bypass type protector for ac electric motor |
| CN87204387U (en) * | 1987-06-30 | 1988-08-17 | 湖南省益阳县洞庭电子设备厂 | Phase break and overcurrent protector of motor |
| US5012168A (en) * | 1990-02-20 | 1991-04-30 | Ford Motor Company | Method and apparatus for detecting stall current in an energized electric motor |
-
2004
- 2004-08-25 CN CNB2004100405254A patent/CN100388584C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87202183U (en) * | 1987-02-19 | 1987-10-14 | 锦州市机电研究所 | Bypass type protector for ac electric motor |
| CN87204387U (en) * | 1987-06-30 | 1988-08-17 | 湖南省益阳县洞庭电子设备厂 | Phase break and overcurrent protector of motor |
| US5012168A (en) * | 1990-02-20 | 1991-04-30 | Ford Motor Company | Method and apparatus for detecting stall current in an energized electric motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1599179A (en) | 2005-03-23 |
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Assignee: Lingbayi Electronic Group Sichuan Tianyuan Machinery Co.,Ltd. Assignor: Tian Yongmao Contract record no.: 2010510000121 Denomination of invention: Protection circuit for electric motor Granted publication date: 20080514 License type: Exclusive License Open date: 20050323 Record date: 20101119 |
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Assignee: Lingbayi Electronic Group Sichuan Tianyuan Machinery Co.,Ltd. Assignor: Tian Yongmao Contract record no.: 2010510000121 Date of cancellation: 20120807 |
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Effective date of registration: 20130619 Address after: 233000, No. 14, building 5, Mount Huangshan garden, Bengbu, Anhui Patentee after: BENGBU CITY BORUI PRECISION MACHINERY MANUFACTURING CO., LTD. Address before: 610011 Military Club of Chengdu military area, Chengdu, Sichuan Patentee before: Tian Yongmao |
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