CN203562761U - Motor protection switching circuit - Google Patents
Motor protection switching circuit Download PDFInfo
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- CN203562761U CN203562761U CN201320730117.6U CN201320730117U CN203562761U CN 203562761 U CN203562761 U CN 203562761U CN 201320730117 U CN201320730117 U CN 201320730117U CN 203562761 U CN203562761 U CN 203562761U
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Abstract
The utility model provides a motor protection switching circuit belonging to the technical field of motors, which solves the problem in the prior art that a temperature control switch of a motor circuit is switched on and off repeatedly to cause the frequently repeated start-up of the motor. The motor protection switching circuit comprises a temperature control switch, a motor and a power supply for supplying power to the motor. The switching circuit further comprises a self-locking module triggered by the switch on/off of the temperature control switch and used for cutting off the power supply to the motor. The temperature control switch is connected with the input end of the self-locking module. The output end of the self-locking module is connected with the input end of the motor. By means of the motor protection switching circuit, the motor is prevented from being started repeatedly and frequently so as to be protected.
Description
Technical field
The utility model belongs to technical field of motors, relates to a kind of motor protecting switch circuit.
Background technology
During machine operation, can produce certain heat, when the heat producing, cross higher position and easily make motor damage.At present, by temperature detect switch (TDS) (thermostat) is directly serially connected on the power line of motor, by temperature detect switch (TDS) when motor temperature is too high, control motor and quit work, solve the problem of the too high damage of motor temperature, but, temperature detect switch (TDS) cooling afterwards Deng temperature detect switch (TDS) restores and can make again motor restart, the equitemperature higher motor of controlling again quits work, the switching repeatedly of temperature detect switch (TDS) will cause motor frequent starting repeatedly, like this there is to serious impact in the life-span of the mechanical part of motor and enamelled wire, when situation especially severe, can directly cause motor to damage.
Again due to real motor use in, often run into that in circuit, electric current is excessive, current fluctuation is large or the situation such as natural temperature is high, easily cause temperature detect switch (TDS) misoperation disable motor, therefore, when using motor, just often run into motor frequent starting repeatedly.
As, the motor with thermostat that the disclosed patent No. of Chinese patent literature is 201220335311.X, comprise rotor, stator, described rotor comprises bearing and rotor winding, on the rotor winding of described motor, be also provided with thermostat, described power supply, thermostat, rotor windings in series become closed-loop path.This patent can make to stop machine operation and protect motor when motor temperature is higher, but this patent could not solve by thermostat namely temperature detect switch (TDS) repeatedly open and close the motor problem of frequent starting repeatedly that causes.
Summary of the invention
There are the problems referred to above for existing technology in the utility model, has proposed a kind of motor protecting switch circuit, this motor protecting switch circuit can prevent motor repeatedly frequent starting and play protection motor effect.
The utility model is realized by following technical proposal: a kind of motor protecting switch circuit; comprise temperature detect switch (TDS), motor and the power supply for powering to motor; it is characterized in that; this switching circuit also comprise by temperature detect switch (TDS) disconnect or closed trigger make motor no longer electric self-locking module; described temperature detect switch (TDS) connects the input of self-locking module, and the output of described self-locking module connects the input of motor.
According to self-locking module specifically need to select temperature detect switch (TDS) to disconnect or closure triggers, when temperature detect switch (TDS) does not trigger self-locking module and carries out self-locking, power supply is to motor normal power supply, motor is normally worked.When machine operation runs into temperature and is elevated to over design temperature, temperature detect switch (TDS) triggers self-locking module and carries out self-locking, now self-locking module maintenance motor must not be electric, even when temperature detect switch (TDS) recovers original state, self-locking module still can keep the motor must not electricity owing to forming self-locking, so just prevented motor frequent starting repeatedly, only have the power supply of working as again to turn-off once, self-locking module just can be removed self-locking.
In above-mentioned motor protecting switch circuit, described self-locking module comprises driver element and switch element, described driver element connecting valve unit, and described switch element connects input end of motor.After drive unit drives switch element, switch element maintenance motor must not electricity.
In above-mentioned motor protecting switch circuit, described power supply comprises single phase poaer supply, described motor comprises monophase machine, described temperature detect switch (TDS) closure state triggers the switch element of self-locking module, described switch element comprises relay one, described relay one comprises K switch 1, K switch 2 and coil Km1, the contact of one end of described coil Km1 and K switch 1 is connected same one end of single phase poaer supply, the normally opened contact of one end connecting valve K2 of the other end of described coil Km1 and temperature detect switch (TDS), the contact of described K switch 2 is connected the other end of single phase poaer supply with the other end of temperature detect switch (TDS), the normally-closed contact of the normally-closed contact of described K switch 1 and K switch 2 is connected respectively monophase machine input.The normally opened contact that coil Km1 obtains electric, to make K switch 2 contact and K switch 2 when temperature detect switch (TDS) is closed is connected, and coil Km1 forms a namely self-locking of loop with K switch 2, and coil Km1 keeps continuing energising automatically makes the monophase machine all the time must not be electric.
In above-mentioned motor protecting switch circuit, described power supply comprises single phase poaer supply, described motor comprises monophase machine, described temperature detect switch (TDS) off-state triggers the switch element of self-locking module, described switch element comprises relay two, described relay two comprises K switch 3 and coil Km2, one end of described coil Km2 is connected one end of single phase poaer supply with one end of temperature detect switch (TDS), the contact of described K switch 3 connects the other end of temperature detect switch (TDS), the other end of described K switch 3 normally-closed contacts and coil Km2 is connected input of monophase machine, another input of described monophase machine connects another input of single phase poaer supply.When temperature detect switch (TDS) disconnects, the input of monophase machine must not be electric, and coil Km2 two ends produce voltage connects and self-lockings the contact of K switch 3 and K switch 3 normally opened contacts.
In above-mentioned motor protecting switch circuit, described power supply comprises single phase poaer supply, described motor comprises monophase machine, described temperature detect switch (TDS) off-state triggers the switch element of self-locking module, described switch element comprises relay three, relay four and capacitor C 1, described relay three comprises K switch 4 and coil Km3, described relay four comprises K switch 5 and coil Km4, the contact of described K switch 4, the contact of K switch 5 is connected one end of single phase poaer supply with one end of temperature detect switch (TDS), input of described monophase machine, one end of coil Km3 is connected the other end of single phase poaer supply with one end of coil Km4, the other end of described coil Km3 connects the other end of temperature detect switch (TDS), the normally-closed contact of described K switch 4 is by the other end of capacitor C 1 connecting coil Km4, the other end of the normally opened contact connecting coil Km4 of described K switch 5, the normally-closed contact of described K switch 5 connects another input of monophase machine.
When temperature detect switch (TDS) is closed, coil Km3 obtains the contact of electric switch K4 and connects with the normally opened contact of K switch 4, and the contact that coil Km4 must not electric switch K5 keeps the normally-closed contact connection with K switch 5, and monophase machine obtains electric normal work.When temperature detect switch (TDS) disconnects, coil Km3 must not the contact of electric switch K4 and the normally-closed contact of K switch 4 connect, thereby coil Km4 obtains contact and the normally opened contact of electric switch K5 and connects, coil Km4 and K switch 5 forms a namely self-locking of loop, and coil Km4 keeps continuing energising automatically makes the monophase machine all the time must not electricity.
In above-mentioned motor protecting switch circuit, described power supply comprises single phase poaer supply, described motor comprises monophase machine, described temperature detect switch (TDS) closure state triggers the driver element of self-locking module, described drive unit drives switch element, described driver element comprises described in transformer one and rectification filtering unit one that switch element comprises contactor one and relay five, described relay five comprises K switch 6 and coil Km5, the switch input terminal of described contactor one connects single phase poaer supply, the output switching terminal of described contactor one connects monophase machine, one end of described temperature detect switch (TDS) is connected one end of single phase poaer supply with the contact of K switch 6, an input of described transformer one connects respectively coil one end of contactor one and the other end of single phase poaer supply, another input of described transformer one connects respectively the other end of temperature detect switch (TDS) and the normally opened contact of K switch 6, the normally-closed contact of described K switch 6 connects the coil other end of contactor one, described transformer one output connects rectification filtering unit one input, described rectification filtering unit one output connecting coil Km5.
When temperature detect switch (TDS) off-state coil Km5 must not be electric, the contact of K switch 6 keeps connecting with the normally-closed contact of K switch 6, thereby the coil of contactor one obtains electric switch conduction single phase poaer supply and the monophase machine that makes contactor one, when temperature detect switch (TDS) closure state, make coil Km5 obtain the contact of electric control switch K6 and the connection of the normally opened contact of K switch 6, thereby the coil of contactor one must not be electric, make the not conducting of switch of contactor one, and due to coil Km5 and a namely self-locking of loop of K switch 6 formation, coil Km5 automatically keeps continuing energising makes the monophase machine all the time must not electricity.
In above-mentioned motor protecting switch circuit, described power supply comprises three phase mains, described motor comprises three phase electric machine, described temperature detect switch (TDS) off-state triggers the driver element of self-locking module, described drive unit drives switch element, described driver element comprises transformer two, rectification filtering unit two, capacitor C 2, capacitor C 3 and capacitor C 4, described switch element comprises contactor two and relay six, described relay six comprises K switch 7 and coil Km6, the switch input terminal of described contactor two connects three phase mains, the output switching terminal of described contactor two connects three phase electric machine, the three-phase of described three phase mains is drawn respectively a wiring, interconnect, form the node of zero current, described capacitor C 2, capacitor C 3 and capacitor C 4 are separately positioned in the wiring that three-phase draws, described node is input of connection transformer two and the normally opened contact of K switch 7 respectively, another input of described transformer two connects coil one end of contactor two, the normally-closed contact of described K switch 7 connects the coil other end of contactor two, described temperature detect switch (TDS) is arranged in any one wiring of drawing mutually of three phase mains, the contact of described K switch 7 connects any one wiring of drawing mutually of three phase mains and can obtain electric, described transformer two outputs connect rectification filtering unit two inputs, described rectification filtering unit two output connecting coil Km6.
When temperature detect switch (TDS) closure state node is zero current, coil Km6 must not be electric, motor is normally worked, when temperature detect switch (TDS) off-state node produces electric current and voltage, that coil Km6 is obtained is electric, the contact of coil Km6 control switch K7 and the normally opened contact of K switch 7 are connected, and contactor two coil must not quit work by electric three phase electric machine, and due to coil Km6 and a namely self-locking of loop of K switch 7 formation, coil Km6 keeps continuing energising automatically, and three phase electric machine is not worked all the time.
In above-mentioned motor protecting switch circuit, described capacitor C 2, capacitor C 3 are identical with the capacitance size of capacitor C 4.
Compared with prior art, this motor protecting switch circuit has the following advantages:
1, the effective temperature control protection motor and prevent that the switching repeatedly of temperature detect switch (TDS) from causing motor frequent starting repeatedly of the utility model.
The features such as 2, the utlity model has simple in structurely, volume is little, and price is low, and the life-span is long, have good market prospects.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present embodiment one.
Fig. 2 is the structural representation of the present embodiment two.
Fig. 3 is the structural representation of the present embodiment three.
Fig. 4 is the structural representation of the present embodiment four.
Fig. 5 is the structural representation of the present embodiment five.
In figure, 1, single phase poaer supply; 2, monophase machine; 3, temperature detect switch (TDS); 4, relay one; 5, relay two; 6, relay three; 7, relay four; 8, relay five; 9, contactor one; 10, transformer one; 11, rectification filtering unit one; 12, three phase mains; 13, three phase electric machine; 14, relay six; 15, contactor two; 16, transformer two; 17, rectification filtering unit two.
Embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
Embodiment mono-:
As shown in Figure 1; this motor protecting switch circuit comprise temperature detect switch (TDS) 3, motor, for the power supply to motor power supply and by temperature detect switch (TDS) 3 disconnect or closed trigger make motor no longer electric self-locking module; temperature detect switch (TDS) 3 connects the input of self-locking module, and the output of self-locking module connects the input of motor.Self-locking module comprises driver element and switch element, driver element connecting valve unit, switch element connects input end of motor, in the present embodiment, by temperature detect switch (TDS) 3, directly replaces driver element, can certainly add driver element to come driving switch unit as resistance-capacitance depressurization, triode or controllable silicon etc.Power supply comprises single phase poaer supply 1, motor comprises monophase machine 2, temperature detect switch (TDS) 3 closure states trigger the switch element of self-locking module, switch element comprises relay 1, relay 1 comprises K switch 1, K switch 2 and coil Km1, the contact of one end of coil Km1 and K switch 1 is connected same one end of single phase poaer supply 1, the normally opened contact of one end connecting valve K2 of the other end of coil Km1 and temperature detect switch (TDS) 3, the contact of K switch 2 is connected the other end of single phase poaer supply 1 with the other end of temperature detect switch (TDS) 3, the normally-closed contact of the normally-closed contact of K switch 1 and K switch 2 is connected respectively monophase machine 2 inputs.
Temperature detect switch (TDS) 3 is off-state under initial condition, and K switch 1 contact of relay 1 and K switch 1 normally-closed contact are connected, and the contact of K switch 2 and K switch 2 normally-closed contacts are connected.After single phase poaer supply 1 power supply, because temperature detect switch (TDS) 3 is off-state, the coil Km1 of relay 1 must not be electric, the contact of K switch 1 keeps connecting with K switch 1 normally-closed contact, K switch 2 contacts keep connecting with K switch 2 normally-closed contacts, and now, monophase machine 2 is normally worked.
When temperature detect switch (TDS) 3 becomes closure state from off-state, while namely triggering self-locking module temperature control protection monophase machine 2, coil Km1 two ends produce voltage, coil Km1 produces contact and K switch 1 normally opened contact of Magnetic Control K switch 1 and connects, K switch 2 contacts and K switch 2 normally opened contacts are connected, monophase machine 2 power-off are quit work, again because now K switch 2 contacts and K switch 2 normally opened contacts are connected, K switch 2 and coil Km1 form a loop and are powered by single phase poaer supply 1, coil Km1 can keep continuing energising automatically, thereby formation self-locking circuit, even if that is to say temperature detect switch (TDS) 3 gets back to the initial condition of disconnection and can not make coil Km1 power-off, monophase machine 2 is not worked in this case all the time, only have the primary power source of shutoff can make monophase machine 2 normally work.Therefore; this motor protecting switch circuit structure simply can prevent motor repeatedly frequent starting and play protection motor effect; and the use of connecting of temperature detect switch (TDS) and motor in prior art; although be in series with the effect of directly interim disjunction; but the factors such as current fluctuation have no idea to solve; because series connection is used electric current to change with the load of motor and the variation of voltage; the present embodiment is used temperature detect switch (TDS) instead and is connected in parallel in motor lines; can effectively solve the factors such as current fluctuation, because there is no the electric current that passes through of motor needs on temperature detect switch (TDS).
Embodiment bis-:
As shown in Figure 2; this motor protecting switch circuit comprise temperature detect switch (TDS) 3, motor, for the power supply to motor power supply and by temperature detect switch (TDS) 3 disconnect or closed trigger make motor no longer electric self-locking module; temperature detect switch (TDS) 3 connects the input of self-locking module, and the output of self-locking module connects the input of motor.Self-locking module comprises driver element and switch element, driver element connecting valve unit, switch element connects input end of motor, in the present embodiment, by temperature detect switch (TDS) 3, directly replaces driver element, can certainly add driver element to come driving switch unit as resistance-capacitance depressurization, triode or controllable silicon etc.Power supply comprises single phase poaer supply 1, and motor comprises monophase machine 2, and temperature detect switch (TDS) 3 off-states trigger the switch element of self-locking module, and switch element comprises relay 25, and relay 25 comprises K switch 3 and coil Km2.One end of coil Km2 is connected one end of single phase poaer supply 1 with one end of temperature detect switch (TDS) 3, the contact of K switch 3 connects the other end of temperature detect switch (TDS) 3, the other end of K switch 3 normally-closed contacts and coil Km2 is connected 2 one inputs of monophase machine, and monophase machine 2 another inputs connect another input of single phase poaer supply 1.
Temperature detect switch (TDS) 3 is closure state under initial condition, and K switch 3 contacts of relay 25 and K switch 3 normally-closed contacts are connected.After single phase poaer supply 1 is powered, because temperature detect switch (TDS) 3 is closure state, the coil Km2 of relay 25 must not be electric, and the contact of K switch 3 keeps connecting with K switch 3 normally-closed contacts, and monophase machine 2 obtains electric normal work.
When temperature detect switch (TDS) 3 becomes off-state from closure state; while namely triggering self-locking module temperature control protection monophase machine 2; coil Km2 two ends produce voltage; coil Km2 produces contact and K switch 3 normally opened contacts of Magnetic Control K switch 3 and connects; although there is a small amount of electric current to flow into monophase machine 2, deficiency is so that monophase machine 2 startup work, and coil Km2 can keep continuing energising automatically; monophase machine 2 must not be worked by electricity all the time, only have the primary power source of shutoff can make monophase machine 2 normally work.Therefore, this motor protecting switch circuit structure simply can prevent motor repeatedly frequent starting and play protection motor effect.
Embodiment tri-:
As shown in Figure 3; this motor protecting switch circuit comprise temperature detect switch (TDS) 3, motor, for the power supply to motor power supply and by temperature detect switch (TDS) 3 disconnect or closed trigger make motor no longer electric self-locking module; temperature detect switch (TDS) 3 connects the input of self-locking module, and the output of self-locking module connects the input of motor.Self-locking module comprises driver element and switch element, driver element connecting valve unit, switch element connects input end of motor, in the present embodiment, by temperature detect switch (TDS) 3, directly replaces driver element, can certainly add driver element to come driving switch unit as resistance-capacitance depressurization, triode or controllable silicon etc.Power supply comprises single phase poaer supply 1, and motor comprises monophase machine 2, and temperature detect switch (TDS) 3 off-states trigger the switch element of self-locking module.Switch element comprises relay 36, relay 47 and capacitor C 1, and relay 36 comprises K switch 4 and coil Km3, and relay 47 comprises K switch 5 and coil Km4.The contact of the contact of K switch 4, K switch 5 is connected one end of single phase poaer supply 1 with one end of temperature detect switch (TDS) 3, one end of 2 one inputs of monophase machine, coil Km3 is connected the other end of single phase poaer supply 1 with one end of coil Km4, the other end of coil Km3 connects the other end of temperature detect switch (TDS) 3, the normally-closed contact of K switch 4 is by the other end of capacitor C 1 connecting coil Km4, the other end of the normally opened contact connecting coil Km4 of K switch 5, the normally-closed contact of K switch 5 connects monophase machine 2 another inputs.
Temperature detect switch (TDS) 3 is closure state under initial condition, and K switch 4 contacts of relay 36 and K switch 4 normally-closed contacts are connected, and K switch 5 contacts of relay 47 and K switch 5 normally-closed contacts are connected.After single phase poaer supply 1 power supply, because temperature detect switch (TDS) 3 is closure state, the coil Km3 of relay 36 obtains electric, produce the contact of Magnetic Control K switch 4 and the connection of the normally opened contact of K switch 4, utilize capacitor C 1 energising to inhale to put coil Km4 that the moment not having when saturated cuts off relay 47 to obtain electric, be equivalent to circuit delay, so the coil Km5 of relay 47 must not electricity, K switch 5 contacts keep connecting with K switch 5 normally-closed contacts, and monophase machine 2 obtains electric normal work.
When temperature detect switch (TDS) 3 becomes off-state from closure state, while namely triggering self-locking module temperature control protection monophase machine 2, coil Km3 must not be electric, K switch 4 contacts recover to connect with K switch 4 normally-closed contacts, now, coil Km4 obtains electric generation magnetic force connects K switch 5 contacts and K switch 5 normally opened contacts, K switch 5 and coil Km4 form a loop and are powered by single phase poaer supply 1, coil Km4 can keep continuing energising automatically, thereby formation self-locking circuit, even if that is to say temperature detect switch (TDS) 3 gets back to closed initial condition and can not make coil Km4 power-off, monophase machine 2 is not worked in this case all the time, only have the primary power source of shutoff can make monophase machine 2 normally work.Therefore, this motor protecting switch circuit structure simply can prevent motor repeatedly frequent starting and play protection motor effect.
Embodiment tetra-:
As shown in Figure 4; this motor protecting switch circuit comprise temperature detect switch (TDS) 3, motor, for the power supply to motor power supply and by temperature detect switch (TDS) 3 disconnect or closed trigger make motor no longer electric self-locking module; temperature detect switch (TDS) 3 connects the input of self-locking module, and the output of self-locking module connects the input of motor.Self-locking module comprises driver element and switch element, driver element connecting valve unit, and switch element connects input end of motor.Power supply comprises single phase poaer supply 1, and motor comprises monophase machine 2, and temperature detect switch (TDS) 3 closure states trigger the driver element of self-locking module, drive unit drives switch element.Driver element comprises transformer 1 and rectification filtering unit 1, and switch element comprises contactor 1 and relay 58, and relay 58 comprises K switch 6 and coil Km5.The switch input terminal of contactor 1 connects single phase poaer supply 1, the output switching terminal of contactor 1 connects monophase machine 2, one end of temperature detect switch (TDS) 3 is connected one end of single phase poaer supply 1 with the contact of K switch 6, an input of transformer 1 connects respectively coil one end of contactor 1 and the other end of single phase poaer supply 1, another input of transformer 1 connects respectively the other end of temperature detect switch (TDS) 3 and the normally opened contact of K switch 6, the normally-closed contact of K switch 6 connects the coil other end of contactor 1, transformer one 10 outputs connect rectification filtering unit one 11 inputs, rectification filtering unit one 11 output connecting coil Km5.
Contactor refers in industrial electro and utilizes coil current flowing to produce magnetic field, makes contact closure, to reach the electrical equipment of control load.Temperature detect switch (TDS) 3 is off-state under initial condition, K switch 6 contacts of relay 58 and K switch 6 normally-closed contacts are connected, after single phase poaer supply 1 power supply, because temperature detect switch (TDS) 3 is off-state, the coil Km5 of relay 58 must not be electric, and the contact of K switch 6 keeps connecting with K switch 6 normally-closed contacts, and now the coil of contactor 1 obtains electric, the switch conduction single phase poaer supply 1 and monophase machine 2 that make contactor 1, monophase machine 2 is normally worked.
When temperature detect switch (TDS) 3 becomes closure state from off-state, while namely triggering self-locking module temperature control protection monophase machine 2, supply voltage is given coil Km5 power supply after transformer one 10 transformations and rectification filtering unit one 11 rectifying and wave-filterings, coil Km5 produces magnetic force connects K switch 6 contacts and K switch 6 normally opened contacts, K switch 6 and coil Km5 form a loop and are powered by single phase poaer supply 1, coil Km5 can keep continuing energising automatically, thereby formation self-locking circuit, even if that is to say temperature detect switch (TDS) 3 gets back to the initial condition of disconnection and can not make coil Km5 power-off, the coil of contactor 1 must not electric contactor 1 not conducting of switch, therefore monophase machine 2 is not worked in this case all the time, only have the primary power source of shutoff can make monophase machine 2 normally work.Above-mentioned self-locking module is applicable to powerful monophase machine 2.Therefore; this motor protecting switch circuit structure simply can prevent motor repeatedly frequent starting and play protection motor effect; and the use of connecting of temperature detect switch (TDS) and motor in prior art; although be in series with the effect of directly interim disjunction; but the factors such as current fluctuation have no idea to solve; because series connection is used electric current to change with the load of motor and the variation of voltage; the present embodiment is used temperature detect switch (TDS) instead and is connected in parallel in motor lines; can effectively solve the factors such as current fluctuation, because there is no the electric current that passes through of motor needs on temperature detect switch (TDS).
Embodiment five:
As shown in Figure 5; this motor protecting switch circuit comprise temperature detect switch (TDS) 3, motor, for the power supply to motor power supply and by temperature detect switch (TDS) 3 disconnect or closed trigger make motor no longer electric self-locking module; temperature detect switch (TDS) 3 connects the input of self-locking module, and the output of self-locking module connects the input of motor.Self-locking module comprises driver element and switch element, driver element connecting valve unit, and switch element connects input end of motor.Power supply comprises three phase mains 12, motor comprises three phase electric machine 13, temperature detect switch (TDS) 3 closure states trigger the driver element of self-locking module, drive unit drives switch element, driver element comprises transformer 2 16, rectification filtering unit 2 17, capacitor C 2, capacitor C 3 and capacitor C 4, and switch element comprises contactor 2 15 and relay 6 14.Relay 6 14 comprises K switch 7 and coil Km6.The switch input terminal of contactor 2 15 connects three phase mains 12, and the output switching terminal of contactor 2 15 connects three phase electric machine 13.The three-phase of three phase mains 12 is drawn respectively a wiring and is interconnected, form the node of zero current, capacitor C 2, capacitor C 3 and capacitor C 4 are separately positioned in the wiring that three-phase draws, capacitor C 2, capacitor C 3 identical with the capacitance size of capacitor C 4 (their capacity requirement is that 1 microfarad is following).Node is input of connection transformer 2 16 and the normally opened contact of K switch 7 respectively, another input of transformer 2 16 connects coil one end of contactor 2 15, the normally-closed contact of K switch 7 connects the coil other end of contactor 2 15, temperature detect switch (TDS) 3 is arranged in any one wiring of drawing mutually of three phase mains 12, the contact of K switch 7 connects any one wiring of drawing mutually of three phase mains 12 and can obtain electric, transformer 2 16 outputs connect rectification filtering unit 2 17 inputs, rectification filtering unit 2 17 output connecting coil Km6.
Temperature detect switch (TDS) 3 is closure state under initial condition, and K switch 7 contacts of relay 6 14 and K switch 7 normally-closed contacts are connected.After three phase mains 12 power supply because temperature detect switch (TDS) 3 is closure state, again because temperature detect switch (TDS) 3 is arranged in any one wiring of drawing mutually of three phase mains 12, so disconnected phase of the three-phase of three phase mains 12, the three-phase of three phase mains 12 is drawn respectively the node zero current that a wiring is interconnected to form and is passed through, thereby the coil Km6 of relay 6 14 must not be electric, the contact of K switch 7 keeps connecting with K switch 7 normally-closed contacts, now the coil of contactor 2 15 obtains electric, the switch conduction three phase mains 12 and three phase electric machine 13 that make contactor 2 15, three phase electric machine 13 is normally worked.
When temperature detect switch (TDS) 3 becomes off-state from closure state; while namely triggering self-locking module temperature control protection three phase electric machine 13; owing to now having lacked a phase in three-phase, the three-phase of three phase mains 12 is drawn respectively the node that a wiring is interconnected to form to be had electric current to pass through and powers to coil Km6.Coil Km6 produces contact and K switch 7 normally opened contacts of Magnetic Control K switch 7 and connects, any one wiring of drawing mutually that connects three phase mains 12 due to the contact of K switch 7 was again (if be both provided with temperature detect switch (TDS) 3 in a wiring of drawing mutually of three phase mains 12, while being connected by the contact of K switch 7 again, the tie point of the contact of K switch 7 and the wiring of drawing is before temperature detect switch (TDS) 3), K switch 7 forms a loop by a power supply mutually of three phase mains 12 with coil Km6, coil Km6 can keep continuing energising automatically, thereby formation self-locking circuit, even if that is to say temperature detect switch (TDS) 3 gets back to closed initial condition and can not make coil Km6 power-off, the coil of contactor 2 15 must not electric contactor 2 15 not conducting of switch, therefore three phase electric machine 13 is not worked in this case all the time, only have the primary power source of shutoff can make three phase electric machine 13 normally work.Above-mentioned self-locking module is applicable to three phase electric machine 13, and is applicable to the work of heavy-duty motor, not only can temperature control protective circuit also can be to three phase electric machine 13 open-phase protections.
Therefore; this motor protecting switch circuit structure simply can prevent motor repeatedly frequent starting and play protection motor effect; and the use of connecting of temperature detect switch (TDS) and motor in prior art; although be in series with the effect of directly interim disjunction; but the factors such as current fluctuation have no idea to solve; because series connection is used electric current to change with the load of motor and the variation of voltage; the present embodiment is used temperature detect switch (TDS) instead and is connected in parallel in motor lines; can effectively solve the factors such as current fluctuation, because there is no the electric current that passes through of motor needs on temperature detect switch (TDS).
From above-described embodiment, can find out that this motor protecting switch circuit is applicable to effectively temperature control protection motor and prevent that the switching repeatedly of temperature detect switch (TDS) 3 from causing motor frequent starting repeatedly of monophase machine 2 and three phase electric machine 13; simple in structure; volume is little; price is low; the features such as the life-span is long, have good market prospects.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although more used the terms such as single phase poaer supply 1, monophase machine 2, temperature detect switch (TDS) 3, relay 1, relay 25, relay 36, relay 47, relay 58, contactor 1, transformer 1, rectification filtering unit 1, three phase mains 12, three phase electric machine 13, relay 6 14, contactor 2 15, transformer 2 16, rectification filtering unit 2 17 herein, do not got rid of the possibility of using other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Claims (8)
1. a motor protecting switch circuit; comprise temperature detect switch (TDS) (3), motor and the power supply for powering to motor; it is characterized in that; this switching circuit also comprise by temperature detect switch (TDS) (3) disconnect or closed trigger make motor no longer electric self-locking module; described temperature detect switch (TDS) (3) connects the input of self-locking module, and the output of described self-locking module connects the input of motor.
2. motor protecting switch circuit according to claim 1, is characterized in that, described self-locking module comprises driver element and switch element, described driver element connecting valve unit, and described switch element connects input end of motor.
3. motor protecting switch circuit according to claim 2, it is characterized in that, described power supply comprises single phase poaer supply (1), described motor comprises monophase machine (2), described temperature detect switch (TDS) (3) closure state triggers the switch element of self-locking module, described switch element comprises relay one (4), described relay one (4) comprises K switch 1, K switch 2 and coil Km1, the contact of one end of described coil Km1 and K switch 1 is connected same one end of single phase poaer supply (1), the normally opened contact of one end connecting valve K2 of the other end of described coil Km1 and temperature detect switch (TDS) (3), the contact of described K switch 2 is connected the other end of single phase poaer supply (1) with the other end of temperature detect switch (TDS) (3), the normally-closed contact of the normally-closed contact of described K switch 1 and K switch 2 is connected respectively monophase machine (2) input.
4. motor protecting switch circuit according to claim 2, it is characterized in that, described power supply comprises single phase poaer supply (1), described motor comprises monophase machine (2), described temperature detect switch (TDS) (3) off-state triggers the switch element of self-locking module, described switch element comprises relay two (5), described relay two (5) comprises K switch 3 and coil Km2, one end of described coil Km2 is connected one end of single phase poaer supply (1) with one end of temperature detect switch (TDS) (3), the contact of described K switch 3 connects the other end of temperature detect switch (TDS) (3), the other end of described K switch 3 normally-closed contacts and coil Km2 is connected (2) inputs of monophase machine, another input of described monophase machine (2) connects another input of single phase poaer supply (1).
5. motor protecting switch circuit according to claim 2, it is characterized in that, described power supply comprises single phase poaer supply (1), described motor comprises monophase machine (2), described temperature detect switch (TDS) (3) off-state triggers the switch element of self-locking module, described switch element comprises relay three (6), relay four (7) and capacitor C 1, described relay three (6) comprises K switch 4 and coil Km3, described relay four (7) comprises K switch 5 and coil Km4, the contact of described K switch 4, the contact of K switch 5 is connected one end of single phase poaer supply (1) with one end of temperature detect switch (TDS) (3), (2) inputs of described monophase machine, one end of coil Km3 is connected the other end of single phase poaer supply (1) with one end of coil Km4, the other end of described coil Km3 connects the other end of temperature detect switch (TDS) (3), the normally-closed contact of described K switch 4 is by the other end of capacitor C 1 connecting coil Km4, the other end of the normally opened contact connecting coil Km4 of described K switch 5, the normally-closed contact of described K switch 5 connects another input of monophase machine (2).
6. motor protecting switch circuit according to claim 2, it is characterized in that, described power supply comprises single phase poaer supply (1), described motor comprises monophase machine (2), described temperature detect switch (TDS) (3) closure state triggers the driver element of self-locking module, described drive unit drives switch element, described driver element comprises transformer one (10) and rectification filtering unit one (11), described switch element comprises contactor one (9) and relay five (8), described relay five (8) comprises K switch 6 and coil Km5, the switch input terminal of described contactor one (9) connects single phase poaer supply (1), the output switching terminal of described contactor one (9) connects monophase machine (2), one end of described temperature detect switch (TDS) (3) is connected one end of single phase poaer supply (1) with the contact of K switch 6, an input of described transformer one (10) connects respectively coil one end of contactor one (9) and the other end of single phase poaer supply (1), another input of described transformer one (10) connects respectively the other end of temperature detect switch (TDS) (3) and the normally opened contact of K switch 6, the normally-closed contact of described K switch 6 connects the coil other end of contactor one (9), described transformer one (10) output connects rectification filtering unit one (11) input, described rectification filtering unit one (11) output connecting coil Km5.
7. motor protecting switch circuit according to claim 2, it is characterized in that, described power supply comprises three phase mains (12), described motor comprises three phase electric machine (13), described temperature detect switch (TDS) (3) off-state triggers the driver element of self-locking module, described drive unit drives switch element, described driver element comprises transformer two (16), rectification filtering unit two (17), capacitor C 2, capacitor C 3 and capacitor C 4, described switch element comprises contactor two (15) and relay six (14), described relay six (14) comprises K switch 7 and coil Km6, the switch input terminal of described contactor two (15) connects three phase mains (12), the output switching terminal of described contactor two (15) connects three phase electric machine (13), the three-phase of described three phase mains (12) is drawn respectively a wiring and is interconnected, form the node of zero current, described capacitor C 2, capacitor C 3 and capacitor C 4 are separately positioned in the wiring that three-phase draws, described node is input of connection transformer two (16) and the normally opened contact of K switch 7 respectively, another input of described transformer two (16) connects coil one end of contactor two (15), the normally-closed contact of described K switch 7 connects the coil other end of contactor two (15), described temperature detect switch (TDS) (3) is arranged in any one wiring of drawing mutually of three phase mains (12), the contact of described K switch 7 connects any one wiring of drawing mutually of three phase mains (12) and can obtain electric, described transformer two (16) outputs connect rectification filtering unit two (17) inputs, described rectification filtering unit two (17) output connecting coil Km6.
8. motor protecting switch circuit according to claim 7, is characterized in that, described capacitor C 2, capacitor C 3 are identical with the capacitance size of capacitor C 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320730117.6U CN203562761U (en) | 2013-11-18 | 2013-11-18 | Motor protection switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320730117.6U CN203562761U (en) | 2013-11-18 | 2013-11-18 | Motor protection switching circuit |
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| CN203562761U true CN203562761U (en) | 2014-04-23 |
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| CN201320730117.6U Expired - Fee Related CN203562761U (en) | 2013-11-18 | 2013-11-18 | Motor protection switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980606A (en) * | 2019-03-01 | 2019-07-05 | 常州猛犸电动科技有限公司 | A kind of thermal-shutdown circuit |
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