CN201294429Y

CN201294429Y - Over current self-recovery type permanent magnetic DC motor

Info

Publication number: CN201294429Y
Application number: CNU2008201354554U
Authority: CN
Inventors: 刘汉忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-14
Filing date: 2008-10-14
Publication date: 2009-08-19
Anticipated expiration: 2018-10-14

Abstract

The utility model relates to an overcurrent self-resetting type permanent-magnet direct current motor comprising a stator shell body, wherein a rotor is traversed in the shell body, notches are arranged on both sides of the shell body, a left and a right electric brush arms and terminals are respectively clamped in the notches, a Z-shaped elastic guide blade is further clamped and fixed in the notches which clamp and connect the left and the right electric brush arms, the other ends of the Z-shaped elastic guide blade is connected with the terminal on the corresponding side, a projection which is used for tightly propping up the Z-shaped elastic guide blade to guarantee good electrical connection between the two is arranged on the corresponding connection between the thermal and the Z-shaped elastic guide blade, and an earthing strip is led from the terminal which is corresponding to a PTC. The motor has beneficial effects that: through the method of connecting a PTC between the elastic guide blade and the terminal in series, the motor has the overcurrent self-resetting function, the end of the Z-shaped elastic guide blade is propped up and fixed on the projection which is matched with the terminals, thereby guaranteeing the good electrical connection between the end and the projection, simplifying the mounting process of products, and greatly improving the practicability and the producibility of the motor.

Description

Overcurrent self-recovering type permanent magnet direct current motor

[technical field]

The utility model relates to a kind of permanent magnet DC motor, refers in particular to a kind of with overcurrent protection and have the high electrical-magnetic compatibility permanent magnet DC motor of self-recovering function.

[background technology]

Permanent magnet direct current motor, when overcurrent when stall (particularly), electric current is big, and its internal rotor coil temperature rise is fast, temperature rise, is easy to cause the damage of motor coil, even brings safety problem to use.Traditional method that prevents the excessive current flow in motor damage normally realizes anti-damage, the purpose that eliminates safe hidden trouble by the method that the pcb board that adds a band of fuse or optional equipment fuse on the motor external circuits is protected motor.Though but this type of safeguard measure is effective; but need on the one hand to be equipped with corresponding device for motor in addition; complicated its installation procedure; in case the fuse in the protection equipment is in case fusing just needs artificial the replacing on the other hand; himself lacks automatic recovery ability, needs more manpower alignment to carry out tracking and maintenance in actual the use, to guarantee electric motor normal working; very inconvenient, the reliability from influenced motor integral body property adorned and use to a great extent also.

And subsequently; have company begin to attempt by with self-recovering type overcurrent protector (PTC) thus be serially connected with realization self-recovering type overcurrent protection between brush arm in the motor and the terminal; but it is unreasonable owing to what the motor interior structure was provided with; make script additionally add the ten minutes very complicated of the operation change of a PTC again with regard to very crowded motor interior; be difficult to adapt to the demand of production in enormous quantities; and owing to sealed in PTC, the problem that the Electro Magnetic Compatibility variation of whole motor is brought also can not be ignored.

[summary of the invention]

The purpose of this utility model is to have overcome above-mentioned defective, provides a kind of built-in PTC band overcurrent from recovering and the overcurrent self-recovering type permanent magnet direct current motor that is easy to assemble rational in infrastructure.

The purpose of this utility model is achieved in that a kind of overcurrent self-recovering type permanent magnet direct current motor, it comprises stator case, be coated with rotor in the housing, the housing both sides are provided with fluting, be connected with left and right brush arm and terminal in the fluting respectively, its improvements are: also fixing in the groove of the left and right brush arm of clamping has Z-shaped elasticity guide card, the other end of Z-shaped elasticity guide card links to each other with the terminal of respective side, and the corresponding Z-shaped elasticity guide card of terminal junction is provided with and is used to make Z-shaped elasticity guide card top solid to guarantee the good protuberance that is electrically connected between the two; Also be serially connected with PTC between described Z-shaped elasticity guide card and the terminal;

Also be serially connected with an electric capacity between the described left and right terminal;

Lead to ground strip on described and the terminal that PTC links to each other.

Than common permanent magnet DC motor, the beneficial effects of the utility model are by connected a Z-shaped elasticity guide card for brush arm, be connected in series the method for a PTC between elasticity guide card and terminal, make motor have the self-healing function of overcurrent, and the end of Z-shaped elasticity guide card is pushed up under self elastic reaction and is fixed on the protuberance of mating terminals, thereby guaranteed good being electrically connected therebetween, the easy greatly installation procedure of entire product, by see the electric capacity of serial connection and the ground strip of drawing in two-terminal, effectively improve the electromagnetic property of motor especially, made the practicality of product and productibility improve greatly.

[description of drawings]

Below in conjunction with accompanying drawing in detail concrete structure of the present utility model is described in detail

Fig. 1 is an internal structure schematic diagram of the present utility model.

Fig. 2 is a left terminal structural representation of the present utility model.

Fig. 3 is a right terminal structural representation of the present utility model.

Fig. 4 is Z-shaped elasticity guide card of the present utility model and brush arm structural representation.

[embodiment]

Below in conjunction with accompanying drawing the utility model specific embodiment is described in detail.

As shown in Figure 1, the utility model relates to a kind of overcurrent self-recovering type permanent magnet direct current motor, and it comprises stator case 10, be coated with rotor 4 in the housing 10, housing 10 both sides are provided with fluting, are connected with left and right brush arm 3 and left terminal 1 in the fluting respectively, right terminal 1,5.As Fig. 2,3, for the good electrical that guarantees 3 of

terminal

1,5 and left and right sides brush arms is connected, the Z-shaped elasticity guide card that links to each other with brush arm 32 is fixed on the

terminal

1,5 by self elastic force top, and on

terminal

1,5, establish with corresponding protuberance 102,502, slight deformation can take place in the protuberance 102,502 by the solid

lower terminal

1,5 in Z-shaped elasticity guide card 2 tops thus, thereby has guaranteed good being electrically connected between the two.Consider that being convenient to

terminal

1,5 is installed in the fluting of housing 10, the lower end of

terminal

1,5 all is bent into back-shaped 101,501.For can be implemented in motor generation overcurrent the time defencive function; in the present embodiment in the elasticity guide card 2 on right side and terminal 5 serial connection one PTC (self-recovering type overcurrent protector); this is the protector that a kind of thermistor of positive temperature coefficient is made; the electric current of motor coil passes through PTC when using at ordinary times; in case generation overcurrent; the electric current of PTC of flowing through increases; temperature raises; its resistance becomes greatly until cutting off electric current; and after power down or current of electric recovery normally; its temperature reduces resistance and descends, thereby has realized overcurrent protection and self-recovering function.

In addition, the utility model also is provided with an electric capacity 7 in housing 10, and electric capacity 7 is connected in series respectively on the hole clipping 103,503 of left and

right terminal

1,5; Also lead to ground strip 6 on the terminal 5 that connects PTC 4, entire product need not add ground strip and electric capacity can satisfy electromagnetic compatibility requirements thus.

Referring to Fig. 4, left and right brush arm 3 lower ends are provided with the carbon of taking on rotor 4 302, and fixing in the groove of the left and right brush arm 3 of clamping has Z-shaped elasticity guide card 2, and Z-shaped elasticity guide card 2 one ends link to each other with brush arm 3, and the then corresponding

splicing ear

1,5 of the other end links to each other.

In sum, because terminal that the utility model adopts and brush arm elastic compression connect the structure of PTC, the corresponding electric capacity hole clipping that is provided with on the terminal has realized that the high reliability solderless between each parts and PTC and the circuit connects in succession in addition, has guaranteed the efficiency of assembling in the entire product production process.

It is to be noted; of the present utility modelly be not limited to above-mentioned execution mode; any simple modification, equivalent variations and modification that any those skilled in the art do the foregoing description in based on technical solutions of the utility model all belong in the protection range of the present utility model.

Claims

1, a kind of overcurrent self-recovering type permanent magnet direct current motor, it comprises stator case, be coated with rotor in the housing, the housing both sides are provided with fluting, be connected with left and right brush arm and terminal in the fluting respectively, it is characterized in that: also fixing in the groove of the left and right brush arm of clamping has Z-shaped elasticity guide card, and the other end of Z-shaped elasticity guide card links to each other with the terminal of respective side, and terminal is provided with and is used to make Z-shaped elasticity guide card top solid to guarantee the good protuberance that is electrically connected between the two; Also be serially connected with PTC between described Z-shaped elasticity guide card and the terminal.

2, overcurrent self-recovering type permanent magnet direct current motor as claimed in claim 1 is characterized in that: also be serially connected with an electric capacity between the described left and right terminal.

3, overcurrent self-recovering type permanent magnet direct current motor as claimed in claim 1 is characterized in that: lead to ground strip on described and the terminal that PTC links to each other.