CN2718888Y

CN2718888Y - Motor with self-protecting device

Info

Publication number: CN2718888Y
Application number: CNU2004200161999U
Authority: CN
Inventors: 郝云峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-13
Filing date: 2004-05-13
Publication date: 2005-08-17
Anticipated expiration: 2014-05-13

Abstract

The utility model relates to a motor with a self-protecting device, which comprises a stator and a rotor, wherein, the coils of each winding on the end connection point of the stator winding are fixed with a temperature-controlling switch, and the temperature-controlling switches arranged on the coils of each winding are connected with each other in parallel, and one end of the coil is connected with the wire connecting terminal of a power supply fire wire arranged on a motor patchboard, and the other end of the coil is connected with ground. When the motor generates the faults, the stator winding generates heating and the temperature rises; the temperature-controlling switch is closed for making the power supply be short circuit towards the ground; the earth leakage protective device of a main current supply return circuit is driven and cuts off the power supply for implementing the purpose of protecting the motor. The utility model changes prior motor protection modes and motor protection components are directly fixed and connected inside of the motor. The utility model has simple structure and convenient use. The motor with the self-protecting device can conduct self protecting for various operation disturbances with the high sensibility of the protection action. The motor with the self-protecting device can avoid various operation disturbances to damage the motor, particularly for the burnout of the stator winding coils.

Description

The motor that has automatic holding device

Technical field

The utility model relates to a kind of motor, is specially a kind of motor that has automatic holding device.

Background technology

During the motor operation exception, as overcurrent, overload, the phase failure, stall etc., show at first in the temperature rise of motor that particularly the temperature of stator winding can sharply rise, unusual to get rid of as untimely outage, the motor stator winding will be burnt.

The thermal relay protection is a kind of motor protection form that generally adopts at present, and it is the effect of playing protection by the variation of thermal relay perception operating current indirectly; Its reaction speed is slow, when phenomenons such as overvoltage, the phase failure, stall, overload occurring at motor, can not in time cut off the electricity supply, and easily causes the motor winding to burn.

The electronic protection cost of motor is too high, complex structure, fragile and can not form general protection to the various faults of motor.

The various error protections of existing motor are all finished in the motor outside; the protective device that is various structures all is the control loop that is arranged in outside the motor and is connected in motor; by abnormal monitoring, realize the error protection of motor to the motor operating current.

Summary of the invention

The utility model is slow at existing motor protecting device reaction speed, complex structure and other problems, and a kind of motor that has automatic holding device is provided.

This reality is novel to be to adopt following technical scheme to realize: the motor that has automatic holding device, comprise stator, rotor, fixing on the coil of every phase winding at stator winding termination place (cementation or tie up attached) temperature detect switch (TDS) is arranged, and (it is in off state at ordinary times, its closure when temperature meets or exceeds the action critical value), temperature detect switch (TDS) on each phase winding coil is parallel with one another, then on an end and the motor wiring plate wherein mutually the binding post of power firestreak link to each other, other end ground connection.

Stator winding is the threephase motor of delta connection, because the upper and lower row's binding post on its terminal block joins in twos, its each phase connection terminal all is the binding post of power firestreak, and the end after the temperature detect switch (TDS) parallel connection can link to each other with the arbitrary binding post mutually on the terminal block; The threephase motor of star connection, row's binding post is a central point on it, and voltage is zero, and following row's terminal is the input of three phase mains, and therefore, the end after the temperature detect switch (TDS) parallel connection can join with any of lower end binding post; The terminal block of single-phase motor is when single phase poaer supply inserts, and live wire, zero line are easily put upside down, and when zero line by chance is connected with the binding post that links to each other with an end of temperature detect switch (TDS), the temperature detect switch (TDS) loop can't start because of no-voltage; For avoiding the generation of the above-mentioned situation of single-phase motor, an end of the temperature detect switch (TDS) of single-phase motor links to each other with center intercoil connection between single-phase winding, like this, can guarantee no matter how single phase poaer supply inserts, but temperature detect switch (TDS) loop operate as normal all.

When motor generation overcurrent, overvoltage, overload, stall phenomenon, no matter threephase motor is delta connection or star connection, its three phase winding all can generate heat simultaneously, theoretically, as long as on the winding coil of a phase fixedly temperature detect switch (TDS) can play a protective role; But when the phase failure, phase shortage appear in motor, the threephase motor of delta connection has a phase winding in work, owing to can't determine to lack which phase, which phase winding in work, therefore, all be fixed with temperature detect switch (TDS) on every phase winding coil of three phase windings, form the multiple spot temperature control; The threephase motor of star connection, an outage is mutually being worked and can generated heat for two in addition, and therefore, the threephase motor of star connection only is fixed with temperature detect switch (TDS) on the coil of its two phase winding, and no matter which cuts off the power supply mutually always has a temperature detect switch (TDS) action of going up mutually.The threephase motor of star connection can cause certain waste and unnecessary structure complicated if all be fixed with temperature detect switch (TDS) on the coil of every phase winding.

Described temperature detect switch (TDS) just often is in off-state, closure when temperature meets or exceeds critical value.Because it will be fixed on the termination of motor interior, stator winding, its overall dimensions should be less; The temperature detect switch (TDS) that satisfies above-mentioned condition has multiple alternative existing product.In embodiment, provided a kind of concrete structure of temperature detect switch (TDS), adopt the temperature detect switch (TDS) of this kind structure, easier, realize the utility model easily.

When above-mentioned various fault appearred in motor, stator winding heating, temperature rose, and the temperature detect switch (TDS) closure makes power supply (phase) shorted to earth, made earth leakage protective device action in the main current supply circuit, cut off the electricity supply, thereby reach the purpose of protection motor.

The utility model is changed traditional motor protection form, and motor interior is directly fixed, is connected in to the motor protection parts; Simple in structure, convenient and easy.This motor that has automatic holding device can carry out self-protection to various operation troubless, and it is highly sensitive that protection is moved, and can effectively avoid the damage of various operation troubless to motor, and particularly the stator winding coil burns.

Description of drawings

Fig. 1 is the electrical connection graph of temperature detect switch (TDS) in the delta connection threephase motor;

Fig. 2 is the electrical connection graph of temperature detect switch (TDS) in the star connection threephase motor;

Fig. 3 is the electrical connection graph of temperature detect switch (TDS) in the single-phase motor;

Fig. 4 is a kind of concrete structure schematic diagram of temperature detect switch (TDS);

Embodiment

The motor that has automatic holding device, comprise stator, rotor, on the coil of every phase winding at stator winding termination place, be fixed with temperature detect switch (TDS), temperature detect switch (TDS) on each phase winding coil is parallel with one another, then on an end and the motor wiring plate wherein mutually the binding post of power firestreak link to each other, other end ground connection.

In the temperature detect switch (TDS) loop, be connected with the parallel branch of resistance R and alarm L.Be used to limit the electric current in temperature detect switch (TDS) loop, in the temperature detect switch (TDS) circuit closed, alarm sends fault alarm.

Described temperature detect switch (TDS) comprises upper cover body 1 that has inner chamber and the lower cover of fixing with upper cover body 2, is fixed with static contact 3 and movable contact spring 4 on the upper cover body, and an end of static contact and movable contact spring stretches out lid; Have inner cavity 5 on the lower end table of lower cover, the bottom of inner cavity has through hole 6, and through hole is built-in with the push rod 7 that is positioned at the movable contact spring below, is fixed with metal thermal change sheet 8 on the lower surface of lower cover.The metal thermal change sheet of this temperature detect switch (TDS) bottom is a temperature sensing part, bottom with warm temperature detect switch (TDS) during use contacts with monitored target (winding coil), when the winding coil heating, when temperature reaches certain value, metal thermal change sheet is heated and upwards is out of shape, with push rod top upwards, make dynamic and static contact contact, reach the temperature detect switch (TDS) closed purpose of being heated.

The lower end of push rod 7 is fixed with end cap 9.End cap can make push rod and metal thermal change sheet keep well contacting, and increases the operating sensitivity of temperature detect switch (TDS).

This temperature detect switch (TDS) volume little (the wide * of long * is thick to be 2*1*1cm) is particularly suitable for being fixed on motor interior (on the winding terminal wiring circle), and it is simple and reasonable for structure, action sensitivity height, reliable operation.

Claims

1, a kind of motor that has automatic holding device, comprise stator, rotor, it is characterized by: on the coil of every phase winding at stator winding termination place, be fixed with temperature detect switch (TDS), temperature detect switch (TDS) on each phase winding coil is parallel with one another, then on an end and the motor wiring plate wherein mutually the binding post of power firestreak link to each other, other end ground connection.

2, the motor that has automatic holding device as claimed in claim 1 is characterized by: the threephase motor of star connection only is fixed with temperature detect switch (TDS) on the coil of its two phase winding.

3, the motor that has automatic holding device as claimed in claim 1 is characterized by: an end of the temperature detect switch (TDS) of single-phase motor links to each other with center intercoil connection between single-phase winding.

4, as claim 1 or the 2 or 3 described motor that have automatic holding device, it is characterized by: described temperature detect switch (TDS) comprises upper cover body (1) that has inner chamber and the lower cover of fixing with upper cover body (2), be fixed with static contact (3) and movable contact spring (4) on the upper cover body, an end of static contact and movable contact spring stretches out lid; Have inner cavity (5) on the lower end table of lower cover, the bottom of inner cavity has through hole (6), and through hole is built-in with the push rod (7) that is positioned at the movable contact spring below, is fixed with metal thermal change sheet (8) on the lower surface of lower cover.

5, the motor that has automatic holding device as claimed in claim 4 is characterized by: the lower end of push rod (7) is fixed with end cap (9).