CN203368000U - A motor three-phase circuit protector - Google Patents

A motor three-phase circuit protector Download PDF

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Publication number
CN203368000U
CN203368000U CN 201320434960 CN201320434960U CN203368000U CN 203368000 U CN203368000 U CN 203368000U CN 201320434960 CN201320434960 CN 201320434960 CN 201320434960 U CN201320434960 U CN 201320434960U CN 203368000 U CN203368000 U CN 203368000U
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CN
China
Prior art keywords
motor
phase
relay
circuit
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201320434960
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Chinese (zh)
Inventor
刘龙浩
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN 201320434960 priority Critical patent/CN203368000U/en
Application granted granted Critical
Publication of CN203368000U publication Critical patent/CN203368000U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a motor three-phase circuit protector. The motor three-phase circuit protector is composed of an open-phase protection circuit and an overload protection circuit. An open-phase protection function of the open-phase protection circuit and an overload protection function of the overload protection circuit are both realized through controlling the on-off of contactor normal open contacts(2) in a motor power supply major loop. When an open-phase case and an overload case of the motor occur, the motor three-phase circuit protector of the utility model can cut off a power supply of a motor distribution box to protect the motor and other devices. The motor three-phase circuit protector is a simple device and is easy to operate.

Description

The motor three phase circuit protector
Technical field
The utility model relates to motor overload or lacuna protective device, especially motor three phase circuit protector.
Background technology
During the motor operation, often can be because fuse disconnect one mutually or other reason makes the motor phase failure operation, the motor of phase-deficient operation easily burns because of overheated.For the protection motor, people usually add motor safety protection device.Existing motor safety protection device generally adopts series connection thermal relay mode to reach the purpose of protection motor; time delay inexactness due to thermal relay; timely deenergization in the time of overload and phase shortage often can not occurring again, thus motor damaged, bring very large economic loss to the user.
Summary of the invention
For above-mentioned deficiency, the utility model provides a kind of motor three phase circuit protector, can be when motor generation phase shortage and overload, and automatic cut-off motor distribution box power supply, reach the purpose of protecting motor and equipment.
The technical solution adopted in the utility model is: the motor three phase circuit protector comprises that major loop, open-phase protection circuit and overload protecting circuit form.
Major loop comprises contactor normally opened contact 2, contactor coil 8;
Open-phase protection circuit comprises star electric capacity 3, bridge heap 4, electrochemical capacitor 17, relay K A1 coil 5, relay K A1 normally closed switch 6;
Overload protecting circuit comprises normally-closed contact 7, relay K A2 coil 15, transformer 9, bridge heap 10, electrochemical capacitor 11, three terminal regulator 12, adjustable resistance 14, fixed value resistance l3, the Thermosenstor 16 of relay;
Contactor normally opened contact 2 is connected on the motor main circuit power supply;
In open-phase protection circuit, A, B, C three phase mains are connected with star electric capacity 3; the neutral point of star electric capacity 3 is connected with the input of bridge heap 4 with the three-phase and four-line neutral point; the output of bridge heap 4 is connected with relay K A1 coil 5 with electrochemical capacitor 17 respectively, and the normally-closed contact 7 of contactor coil 8 and relay K A2, the normally-closed contact 6 of relay K A1 are connected to A phase power supply after connecting.
The input of A phase power supply connection transformer 9 in overload protecting circuit, the output connecting bridge heap 10 of transformer 9, the output of bridge heap 10 is connected with electrochemical capacitor 11, three terminal regulator 12 respectively, three terminal regulator 12 is connected with Thermosenstor 16 control ends with adjustable resistance 14 by fixed value resistance l3, and the major loop of Thermosenstor 16 is connected with three terminal regulator 12 by relay K A2 coil 15; The normally-closed contact 7 of contactor coil 8 and relay K A2, the normally-closed contact 6 of relay K A1 are connected to A phase power supply after connecting; Thermosenstor 16 use wires are drawn from protector, are installed on motor housing.
Three terminal regulator 12 is along with transformer 9 output voltages are selected suitable types.When transformer 9 selects output voltage to be 5V, the model of three terminal regulator 12 is selected 7805 types; When transformer 9 selects output voltage to be 9v, the model of three terminal regulator 12 is selected 7809 types; When transformer 9 selects output voltage to be 12V, the model of two end pressurizers 12 is selected 7812 types.
The normally-closed contact 7 of contactor normally opened contact 2, contactor coil 8, relay, relay coil 15, transformer 9, bridge heap 10, electrochemical capacitor 11, three terminal regulator 12, adjustable resistance l4, fixed value resistance l3, Thermosenstor 16, bridge heap 4, electrochemical capacitor 17, relay coil 5, relay normally-closed contact 6 are all commercially available common components.
The beneficial effects of the utility model: when motor generation phase shortage and overload, automatic cutting off table bed distribution box power supply, protection motor and miscellaneous equipment; Equipment is simple, handled easily.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
In figure: 1. motor distributor, 2. contactor normally opened contact, 3. star electric capacity, 4. bridge is piled, 5. relay K A1 coil, the 6. normally-closed contact of relay K A1,7. the normally-closed contact of relay K A2,8. contactor coil, 9. transformer, 10. bridge is piled, 11. electrochemical capacitor C2,12. three terminal regulators, l3. fixed value resistance, 14. adjustable resistances, 15. relay K A2 coils, l6. Thermosenstor, 17. electrochemical capacitor C1.
Embodiment
Below in conjunction with accompanying drawing embodiment with the utility model is described further.
As shown in Figure l: motor three phase circuit protector open-phase protection circuit comprises that A, B, C three phase mains are connected with star electric capacity 3, the neutral point of star electric capacity 3 is connected with the input of bridge heap 4 with the three-phase and four-line neutral point, the output of bridge heap 4 is connected with relay coil 5 with electrochemical capacitor 17 respectively, contactor coil 8 be connected to A phase power supply after the normally-closed contact 6 of relay K A1 is connected; Overload protecting circuit comprises normally-closed contact 7, relay K A2 coil 15, transformer 9, bridge heap 10, electrochemical capacitor 11, two end pressurizers 12, adjustable resistance l4, fixed value resistance l3, the Thermosenstor 16 of contactor normally opened contact 2, contactor coil 8, relay K A2; Contactor normally opened contact 2 is connected on the motor main circuit power supply, the input of A phase power supply connection transformer 9, the output connecting bridge heap 10 of transformer 9, the output of bridge heap 10 is connected with electrochemical capacitor 11, three terminal regulator 12 respectively, three terminal regulator 12 is connected with Thermosenstor 16 control ends with adjustable resistance l4 by fixed value resistance l3, and the major loop of Thermosenstor 16 is connected with three terminal regulator 12 by relay K A2 coil 15; Contactor coil 8 be connected to A phase power supply after the normally-closed contact 7 of relay K A2 is connected; Thermosenstor 16 use wires are drawn from protector.
Before the motor three phase circuit protector is installed on motor distribution box l end of incoming cables; Thermosenstor 16 is installed on motor housing; when motor input power phase shortage or motor temperature surpass the nominal operation value; the motor three phase circuit protector will cut off the power supply of motor distribution box, reach phase shortage and the overload protection purpose of motor.
The normal working temperature of motor is to be less than 800C.When power phase shortage, by the voltage difference of star electric capacity 3 neutral points and three-phase and four-line neutral point, after bridge is piled 4 rectifications for relay K A1 coil 5; When motor overload, all can cause motor temperature to rise, thereby burn out motor.Therefore the utility model at work, during motor overload, by regulating adjustable resistance l4, the thyristor 16 of having adjusted in advance open shoulder voltage, make its thyristor 16 conductings when the motor housing temperature reaches 800C; Transformer 9 is the 220V alternating current transformation of A phase power supply input low-voltage AC, by bridge pile 10 and three terminal regulator 12 obtain direct current, for thyristor 16.
When motor works, thyristor 16 is in off-state, and relay K A2 coil 15 does not have electric current to pass through, normally-closed contact 7 closures of relay K A2; The voltage difference of star electric capacity 3 neutral points and three-phase and four-line neutral point is 0V, and relay K A1 coil 5 does not have electric current to pass through, normally-closed contact 6 closures of relay K A1.Now contactor coil 8 conductings, contactor normally opened contact 2 closures, A, B, C three phase mains are normally powered to the motor distribution box; When motor temperature is greater than 800C, due to thyristor 16 conductings of having adjusted in advance, thus 15 conductings of relay K A2 coil, the normally-closed contact 7 of relay K A2 disconnects, contactor coil 8 power supplys are disconnected, and contactor normally opened contact 2 is in off-state, and motor distribution box power supply is disconnected; When power phase shortage, can produce voltage difference between star electric capacity 3 neutral points and three-phase and four-line neutral point, thereby relay K A1 coil 5 conductings, the normally-closed contact 6 of relay K A1 disconnects, contactor coil 8 power supplys are disconnected, contactor normally opened contact 2 is in off-state, and motor distribution box power supply is disconnected.Reach phase shortage and the overload protection purpose of motor and other electric equipment.

Claims (2)

1. a motor three phase circuit protector, it is characterized in that: the motor three phase circuit protector is comprised of open-phase protection circuit and overload protecting circuit, wherein:
Open-phase protection circuit is to connect star electric capacity by A, B, C three phase mains, the neutral point of star electric capacity and three-phase and four-line neutral point connecting bridge heap, and the output of bridge heap is connected with electrochemical capacitor, relay coil;
Overload protecting circuit comprises normally-closed contact, relay coil, transformer, Qiao Dui, electrochemical capacitor, three terminal regulator, adjustable resistance, fixed value resistance, the Thermosenstor of contactor normally opened contact, contactor coil, relay;
The contactor normally opened contact is connected on the lathe main circuit power supply, overload protecting circuit is by the input of A phase power supply connection transformer, the output connecting bridge heap of transformer, the output of bridge heap is connected with electrochemical capacitor, three terminal regulator respectively, three terminal regulator is connected with the Thermosenstor control end with adjustable resistance by fixed value resistance, and the major loop of Thermosenstor is connected with three terminal regulator by relay; Contactor coil be connected to A phase power supply after the normally-closed contact of relay is connected; Thermosenstor is drawn from protector with wire, is installed on motor housing.
2. a kind of motor three phase circuit protector according to claim 1, is characterized in that: before the motor three phase circuit protector is installed on motor distribution box end of incoming cables.
CN 201320434960 2013-07-22 2013-07-22 A motor three-phase circuit protector Expired - Fee Related CN203368000U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320434960 CN203368000U (en) 2013-07-22 2013-07-22 A motor three-phase circuit protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320434960 CN203368000U (en) 2013-07-22 2013-07-22 A motor three-phase circuit protector

Publications (1)

Publication Number Publication Date
CN203368000U true CN203368000U (en) 2013-12-25

Family

ID=49815719

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320434960 Expired - Fee Related CN203368000U (en) 2013-07-22 2013-07-22 A motor three-phase circuit protector

Country Status (1)

Country Link
CN (1) CN203368000U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105514933A (en) * 2016-01-08 2016-04-20 中国人民解放军军械工程学院 Smart protection device for distribution box and distribution box having smart protection function
CN109599839A (en) * 2019-01-14 2019-04-09 深圳和而泰智能控制股份有限公司 A kind of protection circuit and blender

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105514933A (en) * 2016-01-08 2016-04-20 中国人民解放军军械工程学院 Smart protection device for distribution box and distribution box having smart protection function
CN105514933B (en) * 2016-01-08 2018-01-09 中国人民解放军军械工程学院 A kind of intelligent protection device of distribution box and the distribution box with intelligent protection function
CN109599839A (en) * 2019-01-14 2019-04-09 深圳和而泰智能控制股份有限公司 A kind of protection circuit and blender

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131225

Termination date: 20140722

EXPY Termination of patent right or utility model