CN2167466Y - Multi-function electric motor protector - Google Patents
Multi-function electric motor protector Download PDFInfo
- Publication number
- CN2167466Y CN2167466Y CN 93231097 CN93231097U CN2167466Y CN 2167466 Y CN2167466 Y CN 2167466Y CN 93231097 CN93231097 CN 93231097 CN 93231097 U CN93231097 U CN 93231097U CN 2167466 Y CN2167466 Y CN 2167466Y
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- motor
- triode
- diode
- resistance
- voltage
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Abstract
The utility model relates to a multi-function electric motor protector, primarily comprising a power rectifying filter circuit composed of a power transformer, a rectifying diode, and a capacitor, a stabilized voltage supply composed of a current-limiting resistor and a voltage stabilizing diode, a voltage division detection circuit composed of a thermistor, a light emitting diode, and a resistor, and the detection circuit of motor service voltage composed of a resistor and a diode. The existing motor protector has the disadvantages of single function, small protection range, and low sensitivity. The utility model has a good protection function for motor burnt phenomena caused by phase lack, unbalance three phase electricity, low voltage, overload, bad heat radiation, etc.
Description
The utility model relates to a kind of protective device of motor; particularly a kind of can be low because of phase shortage, three-phase electricity imbalance, voltage to motor, excess load, heat radiation is bad, bearing is bad etc., and motor burnout phenomenon that reason causes plays a protective role, and guarantees the multifunctional motor-driven motor protector of motor trouble free service.
At present, China adopts the thermal relay overcurrent protection to the protection great majority of motor, and this relay is a thermal element on connecting on the main line of motor, makes thermal element heating, distortion, promotes the contact action by the electric current that flows through motor.This relay sensitivity is low, be difficult for to adjust, when electric current adjust hour, motor starting does not get up, when electric current adjust big the time, though, reduced sensitivity to motor protection to not influence of motor.Be difficult to find suitable adjusting range, the motor of different size size, its operating current is not of uniform size, therefore, produce and use in must adopt the thermal elements of different sizes according to the motor of different size size, all make troubles for production and use producer.And the thermal element power consumption is big, blows easily, causes the motor phase shortage, like this, not only motor is not had good protective effect, on the contrary the easy burn-out motor.
The employing open phase protector that has is protected threephase motor.This open phase protector scope of application is very little, and is to the protection of motor, all inapplicable for monophase machine or other motors when only being applicable to the threephase motor phase shortage.And to three phase electric machine because of brownout, overtension, motor load is overweight, bearing is bad, ventilation and heat is bad, the motor burnout phenomenon that reason causes such as make moist can not play a protective role.I have good protective effect to a variety of causes that the above motor bulk temperature progressively raises by the motor over-temperature protector of invention in 92 years; but to motor because of phase shortage; Voltage unbalance; the local heating fast of the motor that reasons such as short circuit cause phenomenon can not work immediately; have only the bulk temperature of waiting until motor to surpass the temperature of adjusting and just can play a protective role, reflection is not really sensitive.
The purpose of this utility model just provides a kind of advantage of phase failure protector and overtemperature prote device and multi-functional electric motor protecting device simple in structure, easy to use, applied widely of integrating.
Task of the present utility model is finished like this: motor protector is formed power supply rectification filter circuit by power transformer, rectifier diode, electric capacity, for protector provides power supply.Form stabilized voltage power supply by current-limiting resistance and voltage stabilizing didoe, the base bias power supply is provided for the sampling amplifying triode of protector.By thermistor, light-emitting diode, fixed carbon resister, adjustable resistance are formed bleeder circuit, base bias current are provided for the sampling amplifying triode, by the variation of motor working temperature, make the change in resistance of thermistor, thereby change the base current of sampling amplifying triode.Through after the one-level triode carry out promoting the actuating of relay after electric current amplifies, thereby reach motor is carried out temperature controlled purpose.By the power supply of three identical resistance, as testing circuit to the motor operating voltage according to star connection access motor.When the three phase mains balance; the voltage of its common point is zero over the ground, when three phase mains is uneven, such as: when phase shortage, short circuit; its common point voltage to earth is non-vanishing; alternating voltage is arranged after the diode rectification, be added to the base stage of sampling amplifying triode, its base potential is raise; after the two-stage amplification; promote the actuating of relay, cut off the main power source of motor, thereby reach the purpose of motor being carried out the phase shortage short-circuit protection.
Below, the utility model is done describing in further detail in conjunction with the accompanying drawings:
Accompanying drawing is a schematic diagram of the present utility model.
Among the figure on the frame of broken lines 1., 2., 3., 4., 5., 6., 7., 8., represent respectively 8 binding posts that protector is external. 2. the input of transformer (1) 1. connects the power supply of motor, output four commutation diodes of termination (2) bridge rectifier. Output termination one electric capacity (3) at diode (2) carries out filtering. Output termination one thermistor (11) of electric capacity (3), light emitting diode (5) and resistance (16), (17), the base stage of another termination triode (6) of thermistor (11) and light emitting diode (5). The base stage of one termination triode (6) of electric capacity (15), other end earth connection. Electric capacity (15) mainly plays jamproof effect. The emitter stage connecting resistance (14) of triode (6) and the base stage of triode (13), the colelctor electrode of triode (6) connects output by current-limiting resistance (7), the grounded emitter line of triode (13). The collector connecting relay (8) of triode (13) and light emitting diode (10), The other end of light emitting diode (10) is by resistance (12) earth connection.
For the base bias circuit of giving triode (6) provides stabilized power source, be connected to a resistance (4) and Zener diode (18) at the output of electric capacity (3).
Form current rectifying and wave filtering circuit by power transformer (6), commutation diode (2), electric capacity (3), for protector provides power supply. Current-limiting resistance (4) and diode (18) form dividing potential drop, mu balanced circuit. Lower end at current-limiting resistance (4) forms stable voltage, for the base bias circuit of triode (6) provides voltage-stabilized power supply. This power supply provides base current for after light emitting diode (5), thermistor (11), divider resistance (16), adjustable resistance (17) dividing potential drop triode (6). Thermistor (11) carries out temperature detection by 5., 6. draw the inside that is placed on motor with lead to motor. Light emitting diode (5) has function for monitoring to the working condition of thermistor. Just often, light emitting diode (5) does not work, and during thermistor (11) open circuit, diode (5) is luminous, and the expression protector does not possess overheat protection function, during thermistor (11) short circuit, and the protector action, motor starting does not get up. Electric capacity (15) has Anti-Jamming. Resistance (17), (14) have metering function, and triode (6) forms dc amplification circuit. Relay (8) is the coil of DC relay, collector load as triode (13), when the collector current of triode (13) reaches the operating current of relay (8), relay (8) action, 7., the 8. normally-closed contact of internal interface relay, the outside is serially connected on the ac contactor coil loop of control motor, during the DC relay action, cut off the power supply of ac contactor coil, A.C. contactor is disconnected, thereby the cut-out motor Power supply reaches the purpose of protecting motor. Diode (9) is place in circuit oppositely, is connected in parallel on DC relay coil cover two ends, and triode (13) is shielded. (10) be light emitting diode, (12) are current-limiting resistances, and they form the protector working indicating with (8), and just often, light emitting diode (10) is bright. In case the power supply of protector breaks down or the open coil of relay (8), diode (10) does not just work, and when triode (13) saturation conduction relay (8) adhesive, light emitting diode (10) is not luminous yet, and this moment, motor stopped operating. On motor power, three resistance (20) one ends connect motor power by the star method, and the other end connects the base stage of triode (6) by diode (19). Like this, resistance (20) can be used as the testing circuit to motor operation voltage. When the three phase mains balance, the voltage of its common point is zero over the ground, when three phase mains is uneven, during such as phase shortage, short circuit, its common point voltage-to-ground is non-vanishing, its common point voltage-to-ground is non-vanishing, alternating voltage is arranged after diode (19) rectification, is added to the base stage of sampling amplifying triode (6), its base potential is raise, after the two-stage amplification, promote relay (8) action, cut off the main power source of motor. Thereby reach the purpose of motor being carried out the suitable protection of phase shortage.
In conjunction with the accompanying drawings, by changing mode of connection, protector can be realized following several function:
A, the phase shortage that is used for threephase motor, overtemperature duplicate protection:
1., 2., 3. connect three live wires of threephase motor respectively, 4. connect protective earthing, 5., 6. connect thermistor (11), be placed on motor interior, 7., 8. be connected on the A.C. contactor control loop.
B, be used for the open-phase protection of threephase motor:
Press the mode of connection of A, 5., 6. disconnecting, other connections are constant.
C, be used for the overtemperature prote of threephase motor:
4. the mode of connection of pressing A disconnecting, and other connections are constant.
D, be used for the individual event motor and make overtemperature prote:
Press the mode of connection of A, the power supply that 1., 2. inserts the individual event motor, 3., 4. disconnect, other connections are constant.
Embodiment: power transformer (1) adopts input 380V, the small transformers of output 24V.Rectifier diode (2) adopts the pipe of 1N4004.Filter capacitor (3) adopts 46 μ F/50V electrochemical capacitors; current-limiting resistance (4) adopts 15K Ω 1/4W fixed carbon resister; voltage-stabiliser tube (18) adopts the voltage-stabiliser tube of 2CW2.4V; light-emitting diode (5); (10) adopt the common LED luminous tube; triode (6) adopts 3DG12B; current-limiting resistance (7) adopts 45K Ω 1/4W fixed carbon resister; resistance (14) adopts 10K Ω 1/4W fixed carbon resister; triode (13) adopts 9013 pipe; relay (8) adopts JRX-13F type direct current relay; diode (9) adopts the diode of 1N4004; resistance (12) adopts 12K Ω 1/4W resistance; thermistor (11) adopts MF-53-1 type thermistor; (15) adopt 1 μ F/16V electrochemical capacitor; resistance (16) adopts 1.1K Ω 1/4W resistance; resistance (17) adopts the adjustable resistance of 4.7K Ω; diode (19) adopts the diode of 1N4004; resistance (20) adopts the fixed carbon resister of three 85K Ω 1/4W; the protector that utilizes these elements to form; by adjusting the resistance of adjustable resistance (17), can between 50 ℃-110 ℃, carry out overtemperature prote to machine to electricity.When motor phase shortage or Voltage unbalance, in 1 second, protect action.
Claims (1)
1; a kind of multifunctional motor-driven motor protector; it is that output at transformer (1) is connected to four diodes (2); output termination one filter capacitor (3) at diode (2); output termination one thermistor (11) and resistance (16 at electric capacity (3); 17); the base stage of another termination triode (6) of thermistor (11); the emitter connecting resistance (14) of triode (6) and the base stage of triode (13); the collector electrode of triode (6) connects output by current-limiting resistance (7); the grounded emitter line of triode (13); the collector electrode of triode (13) connects a relay (8); light-emitting diode (10) and resistance (12); it is characterized in that on motor power; three resistance (20) one ends connect motor power by star connection; the other end connects the base stage of triode (6) by diode (19); base stage at triode (6) also is connected to an electric capacity (15); output in electric capacity (3) is connected to light-emitting diode (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93231097 CN2167466Y (en) | 1993-05-27 | 1993-05-27 | Multi-function electric motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93231097 CN2167466Y (en) | 1993-05-27 | 1993-05-27 | Multi-function electric motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2167466Y true CN2167466Y (en) | 1994-06-01 |
Family
ID=33807623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93231097 Expired - Fee Related CN2167466Y (en) | 1993-05-27 | 1993-05-27 | Multi-function electric motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2167466Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101379569B (en) * | 2006-02-10 | 2011-03-23 | 矢崎总业株式会社 | Noise-removing wire harness |
-
1993
- 1993-05-27 CN CN 93231097 patent/CN2167466Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101379569B (en) * | 2006-02-10 | 2011-03-23 | 矢崎总业株式会社 | Noise-removing wire harness |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |