CN2553563Y - Wheel-shell type permanent-magnetic DC electric machine - Google Patents

Abstract

The utility model relates to a wheel-shell type permanent-magnetic DC electric machine which aims to solve the defects that both the prior DC brushless motors and the DC brush motors have the disadvantages of complex structure, big failure rate, large noise, weak heat dispersion and short service life. The utility model comprises a rotor and a stator, wherein, the rotor comprises a casing, and end caps which are arranged at the two ends of the casing. The stator comprises a dead axle which is connected with the center of the end cap through a bearing, and a stator body which is arranged at the dead axle; and the utility model is characterized in that an iron core, an armature winding and a commutator are fixed inside the casing; the stator body is provided with a magnetic shoe and a carbon brush which is matched with the commutator, and conductor holes are arranged in the dead axle. The utility model adopts a casing revolving structure. The iron core and the armature winding are fixed inside the casing, therefore the utility model is favorable to disperse heat and increase electrical efficiency; and because of low rotary speed, the utility model can have a stall start, the carbon brush is not wore quickly, and the service tine of the utility model can be extended; in addition,the utility model has the advantages of low operation noise, light pollution, simple structure, steady operation, and good reliability; and the utility mode can reduce the cost of manufacture.

Description

Wheel shell-type permanent magnet DC motor

[technical field]

The utility model relates to a kind of shell-type permanent magnet DC motor of taking turns, and is mainly used in electric bicycle.

[background technology]

Progress along with society; the various vehicles grow with each passing day; people's environmental protection consciousness is simultaneously also more and more stronger, is the life that the noise that produced of the automobile, motorcycle, power assist vehicle etc. of fuel and exhaust emission more and more seriously affect people with fuel oils such as diesel oil, gasoline.Therefore, low noise, light pollution even free of contamination vehicle just more and more are subjected to people's favor, are example with the electric bicycle, and the trend that replaces motorbike is just arranged, and, some cities even plan restriction use power assist vehicle.Yet, the applied DC Brushless Motor complex structure of existing electric bicycle, electronic component is fragile, and failure rate is higher, and staring torque is little, and efficient is low, the cost height; Applied DC electromotor with brush is then low because of having gear reduction transmission mechanism efficient, the manufacturing cost height, and noise is big, and heat dispersion is poor, and the high speed rotating of motor rotor makes the carbon brush wearing and tearing very fast, influences the useful life of motor.

[utility model content]

The technical assignment of the technical problems to be solved in the utility model and proposition is to overcome the technological deficiency that existing product exists, provide a kind of low noise, light pollution, low-speed permanent-magnet simple in structure, safe and reliable, that operate steadily that the brush direct current machine is arranged, and then reduce its manufacturing cost, improve heat dispersion, increase the service life.

The technical scheme that the utility model is taked is: wheel shell-type permanent magnet DC motor, comprise rotor and stator, its rotor comprises the end cap at shell and two ends thereof, stator comprises by bearing and is connected in the fixed axis at end cap center and the stator body on the fixed axis, it is characterized in that the inboard secured core of shell, armature winding and commutator; The carbon brush that stator body is provided with magnetic shoe and cooperates with commutator has wire guide in the described fixed axis.During use, the DC power supply lead is connected with carbon brush on the stator body, gives armature winding with current delivery through commutator by the wire guide in the fixed axis, thereby generate an electromagnetic field, the permanent magnetic field that this electromagnetic field and magnetic shoe produced interacts, and rotor is rotated around stator, and then drive wheels.The utility model adopts the outer housing rotary type structure, and iron core, armature winding are fixed inside the shell, helps heat radiation and improves electric efficiency; And can carry out stepless speed regulation by the size of control DC power supply electric current, can zero starting, its maximum speed can just have the brush gear reduction the original rotating speed of direct current machine 1/10, the unlikely quick wearing and tearing of carbon brush make its life-span be able to nearly ten times prolongation; Simultaneously owing to omitted the gear reduction transmission mechanism, its running noise is low, it is light, simple in structure to pollute, operate steadily, safe and reliable, and reduced manufacturing cost.

As to further the improving and optimize of technique scheme, commutator is made as discoid, and be fixed in the inboard of armature winding one end, make its working face vertical with fixed axis, structure is more compact; Stator body is an integral structure, and magnetic shoe directly is distributed on its outer rim, and available bonding way is fixed, the convenient making; The outer rim inboard is an annular groove, gain is offered in the annular groove bottom, be provided with axial carbon brush holder in the gain, carbon brush be positioned at carbon brush holder and with commutator shaft to contacting, can effectively reduce axial dimension, weight and the consumptive material of motor, carbon brush can move in gain by carbon brush holder, overlaps with physical centre with the electrfic centre of regulating motor, improves motor properties; The end cap outside is provided with external screw thread, is respectively applied for brake wheel and sprocket wheel are installed; One is screwed onto axle sleeve on the fixed axis between fixed axis and end cap, can adjust the position of motor on bicycle tail frame by regulating axle sleeve; The shell outside is provided with bulge loop, is evenly equipped with connecting hole on the bulge loop.

The utility model adopts the outer housing rotary type structure, iron core, armature winding and commutator is fixing inside the shell, compact conformation and help heat radiation and improve electric efficiency, and can carry out stepless speed regulation by the size of control DC power supply electric current, and the maximum speed spy is low, the unlikely quick wearing and tearing of carbon brush do not need reducing gear; Carbon brush is placed in the gain on the stator body, and with commutator shaft to contacting, shortened the axial dimension of motor, and can in gain, do circumferential adjustment in a small amount, the electrfic centre of motor is overlapped, the raising motor properties with physical centre.Its noise is low, it is light, simple in structure, safe and reliable to pollute, operate steadily, thereby reduces its manufacturing cost, increases the service life.

[description of drawings]

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1-fixed axis, 2-axle sleeve, 3-external screw thread, 4-bearing, 5-end cap, 6-commutator, 7-carbon brush, 8-carbon brush holder, 9-armature winding, 10-connecting hole, 11-iron core, 12-shell, 13-bulge loop, 14-magnetic shoe, 15-stator body, 16-wire guide, 17-annular groove.

[embodiment]

As shown in the figure, the shell 12 of epicycle shell-type permanent magnet DC motor is circular, secured core 11 on its inwall, armature winding 9 is embedded in iron core 11 grooves and forms annular, discoid commutator 6 is fitted in the left end of iron core endoporus and is electrically connected with armature winding 9, the working face of commutator 6 to the right, thereby between commutator 6 and armature winding 9, form a round barrel shape space.Stator body 15 once is cast into the integral structure that both sides have annular groove 17 by cast steel, in fine finishining is placed on aforementioned round barrel shape space, and the in pairs even bonding magnetic shoe of making by rare earth material 14 on its outer rim; Annular groove 17 bottom symmetries are offered two gains, and carbon brush holder 8 is installed in the gain, and carbon brush 7 places in the carbon brush holder 8, and carbon brush 7 the inners are connected with power spring, are used for carbon brush is conflicted at the working face of commutator, are connected with dc wire simultaneously; Stator body 15 is connected on the fixed axis 1 by its centre bore; Fixed axis 1 is connected with the end cap 5 at shell two ends by rolling bearing 4, and 5 of end caps are connected the two ends of shell 12 by screw, in order to protect armature winding, the insulation protection pad can be set between armature winding and end cap; Be provided with axle sleeve 2 between fixed axis 1 and the end cap 5, and axle sleeve and fixed axis can guarantee the drying insulation of Lubrication of Rolling Contact Bearing and enclosure by being threaded; The outside of two end cap 5 is equipped with external screw thread 3, is respectively applied for brake wheel and sprocket wheel are installed; The right section center of fixed axis 1 has wire guide 16, with so that the lead of DC power supply from outside wear to stator and with the spring of carbon brush the inner through wire guide and to link to each other.The two ends of fixed axis are made as flat axle, are convenient to be fixed on the bicycle tail frame with nut and pad with locking pad.The shell outside is provided with two bulge loops 13, is evenly equipped with connecting hole 10 on the bulge loop 13, is used to connect vehicle wheel spoke.

The dc permanent magnet motor made of scheme thus, with rated power be 130 watts, rated current be 5 amperes, rated voltage to be 36 volts be example, its unloaded noise is less than 55 decibels.

Claims (3)

1, wheel shell-type permanent magnet DC motor, comprise rotor and stator, its rotor comprises the end cap (5) at shell (12) and two ends thereof, stator comprises by bearing (4) and is connected in the fixed axis (1) at end cap (5) center and the stator body (15) on the fixed axis, it is characterized in that the inboard secured core of shell (12) (11), armature winding (9) and commutator (6); The carbon brush (7) that stator body (15) is provided with magnetic shoe (14) and cooperates with commutator has wire guide (16) in the described fixed axis (1).

2, the shell-type permanent magnet DC motor of taking turns according to claim 1 is characterized in that commutator (6) is in the form of annular discs, is fixed in the inboard of armature winding (9) one ends, and its working face is vertical with fixed axis; Stator body (15) is an integral structure, magnetic shoe (14) directly is distributed on its outer rim, and the outer rim inboard is annular groove (17), and gain is offered in the annular groove bottom, be provided with axial carbon brush holder (8) in the gain, carbon brush (7) is positioned at carbon brush holder (8) and axially contacts with commutator (6).

3, the shell-type permanent magnet DC motor of taking turns according to claim 1 and 2 is characterized in that end cap (5) outside is provided with external screw thread (3); One axle sleeve (2) that is screwed onto on the fixed axis (1) is positioned between fixed axis and the end cap (5); Shell (12) outside is provided with bulge loop (13), is evenly equipped with connecting hole (10) on the bulge loop (13).

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