CN201409076Y

CN201409076Y - Injection-molded step motor

Info

Publication number: CN201409076Y
Application number: CN2009200711671U
Authority: CN
Inventors: 张羽; 吴永松
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2009-04-27
Filing date: 2009-04-27
Publication date: 2010-02-17
Anticipated expiration: 2019-04-27

Abstract

The utility model provides an injection-molded step motor which comprises a stator, a rotor, a rotation shaft, a front bearing, a rear bearing, and a front bearing chamber and a rear bearing chamber which are molded through injection, wherein the stator is laminated and electroplated by stator iron cores and is shaped through injecting and wrapping by heat-proof daiamid PA46 after copper wires arecoiled on poles of the stator iron cores. The injection-molded step motor of the utility model can gradually lower the common difference to the minimum to greatly improve the motor assembly precisionsince the front bearing chamber and the rear bearing chamber which are shaped through injection, and the stator which is shaped through injecting and wrapping are adopted, the bearing chambers are directly fixed on the inner hole of the injection surface of the stator iron cores to reduce the thickness of the motor to the minimum.

Description

Injection-molded stepping motor

Technical field

The utility model relates to a kind of motor, particularly a kind of injection-molded stepping motor.

Background technology

Traditional stepping motor is made up of parts such as stator 11, rotor 12, armature spindle 13, front end housing 14, rear end cap 15 and bearings 16 as shown in Figure 1.Stator wherein by the moulding of automatic die punching out silicon steel sheet after automatically lamination form.The bearing top circle at rotating shaft two ends matches on the bearing chamber endoporus of orientating front and rear cover as of this type of motor and the rotor, and the bearing chamber cylindrical of front and rear cover and the endoporus of stator cooperate the location, thereby make rotor be positioned at the center of stator inner hole.But because machining accuracy, the bearing on the armature spindle be subjected to bearing chamber endoporus precision cooperating of bearing chamber endoporus, bearing chamber endoporus and cylindrical concentricity, shaft bearing shelves precision, and the influence of the precision of bearing own; The bearing chamber cylindrical be subjected to bearing chamber cylindrical precision, the precision of stator inner hole, the influence of the concentricity of stator inner hole cooperating of stator core endoporus.These all have influence on the assembly precision of traditional stepping motor.The length of traditional stepping motor is by the thickness decision of the thickness and the end cap of stator core in addition, the thickness of stator core has determined the moment of motor, owing to consider the height and the withstand voltage over the ground creepage distance of motor internal line bag, the thickness of end cap often relatively restricts the gross thickness of motor, if when the client used the moment of motor and motor thickness all had requirement under a lot of situations, traditional stepping motor often can not provide satisfactory to both parties solution.In addition, the mouth that the end cap of tradition stepping motor and stator core cooperate (sees that the sign among Fig. 1 is a) generally shorter, in 2.5mm, and because stator core is a lamination, propping up mouthful contact position with end cap also is one discontinuous, so its bond strength, all is a potential problem in conjunction with precision.

The utility model content

The purpose of this utility model exactly in order to address the above problem, provides a kind of new injection-molded stepping motor.

In order to achieve the above object, the utility model has adopted following technical scheme: a kind of injection-molded stepping motor, comprise stator, rotor, rotating shaft, fore bearing and rear bearing, and be characterized in: the fore bearing chamber and the rear bearing chamber that also comprise injection mo(u)lding; Described stator is electroplated by stator-core lamination, and stator core extremely go up around on behind the copper cash, with the moulding of heat-resistant polyamide PA46 injection moulding parcel; Rotor, fore bearing chamber and rear bearing chamber all are inlaid in the endoporus of stator of injection moulding parcel moulding; Described fore bearing and rear bearing are installed in respectively in the endoporus of fore bearing chamber and rear bearing chamber.

Fit with the continuous injection-molding surfaces of stator inner hole and link to each other in the outer ring of described rotor, the outer ring of described fore bearing chamber and rear bearing chamber links to each other with the continuous injection-molding surfaces pressing of stator inner hole respectively.

Also be provided with two outward extending installing holes on the stator of described injection moulding parcel moulding.

The thickness of described fore bearing chamber and rear bearing chamber is all less than the thickness of bearing mounted thereto.

The described indoor fore bearing of fore bearing that is installed in protrudes laterally, and the medial surface of bearing is concordant with the medial surface of fore bearing chamber; The described indoor rear bearing of rear bearing that is installed in protrudes to the inside, and the lateral surface of bearing is concordant with the lateral surface of rear bearing chamber.

Described fore bearing is greater than rear bearing.

Traditional stepping motor structure is made up of rotor, stator, bearing, front and rear cover.Because the transmission of multiple tracks tolerance, the motor assembly precision is difficult to more high accuracy raising, and the location of motor relies on the support of the bearing chamber of front and rear cover to epitrochanterian bearing, motor length is by the thickness decision of stator core thickness and end cap, the thickness of stator core has determined the moment of motor, if when the client used the moment of motor and motor thickness all had requirement under a lot of situations, traditional stepping motor often can not provide satisfactory to both parties solution.Injection-molded stepping motor of the present utility model has solved above two problems, owing to drop to the tolerance transmission minimum, the motor assembly precision improves greatly, bearing chamber directly is fixed on the stator core injection-molding surfaces endoporus, the thickness of motor will only depend on the thickness and the bearing thickness of stator core like this, thereby the thickness of motor is reduced to minimum.

The utility model is electroplated stator-core lamination, according to set coiling parameter stator core extremely go up around on copper cash, with heat-resistant polyamide PA46 with stator core injection mo(u)lding (final thickness is greater than the thickness of iron core), the line bag was injection molding material fully and wrapped up this moment, did not have the risk of withstand voltage puncture extremely.Stator inner hole after the injection moulding is ground to specified size, exceeds the injection-molding surfaces endoporus of iron core owing to be to grind with the stator core endoporus, concentricity is splendid.Armature spindle behind running in bearings with special bearing chamber interference fit, bearing chamber processing is compared the transmission of end cap tolerance and is reduced a lot, only need to guarantee that inner hole outer circularity size and concentricity get final product, bearing chamber cylindrical and injection moulded stator mating surface unshakable in one's determination also is a continuous face, and assembling motor precision is improved greatly.

Description of drawings

Fig. 1 is the structural representation of prior art stepping motor;

Fig. 2 is the sectional structure schematic diagram of the utility model injection-molded stepping motor;

Fig. 3 is the sectional structure schematic diagram of the injection moulded stator in the utility model;

Fig. 4 is the sectional structure schematic diagram of the injection moulding fore bearing chamber in the utility model;

Fig. 5 is the sectional structure schematic diagram of the injection moulding rear bearing chamber in the utility model;

Embodiment

Referring to Fig. 2, cooperate referring to Fig. 3, Fig. 4, Fig. 5.Injection-molded stepping motor of the present utility model comprises stator 21, rotor 22, rotating shaft 23, fore bearing chamber 24, rear bearing chamber 25, fore bearing 26 and rear bearing 27, and fore bearing 26 is greater than rear bearing 27.

Fore bearing chamber 24 in the utility model and rear bearing chamber 25 all are the working of plasticss of injection mo(u)lding, the internal diameter of its external diameter and stator 21 is suitable, and the endoporus of fore bearing chamber 24 (being used to install fore bearing 26) is greater than the endoporus (being used to install rear bearing 27) of rear bearing chamber 25.

Cooperation is referring to Fig. 3, and the stator 21 in the utility model is to be electroplated by stator-core lamination, and stator core extremely go up around on behind the copper cash, with the hybrid junctions member of heat-resistant polyamide PA46 injection moulding parcel moulding.Its endoporus 211 is through being ground to specified size, and concentricity is splendid.On stator 21, also be provided with two outward extending installing holes 212.

Cooperation is referring to Fig. 4, Fig. 5, and the rotor 22 in the utility model, fore bearing chamber 24 and rear bearing chamber 25 all are inlaid in the endoporus 211 of stator 21 of injection moulding parcel moulding; Fit with the continuous injection-molding surfaces of stator inner hole 211 and link to each other in the outer ring of rotor 22, the outer ring of fore bearing chamber 24 and rear bearing chamber 25 links to each other with the continuous injection-molding surfaces pressing of stator inner hole 211 respectively.The thickness of fore bearing chamber 24 and rear bearing chamber 25 is all less than the thickness of bearing mounted thereto.

Fore bearing 26 in the utility model and rear bearing 27 are installed in respectively in the endoporus of fore bearing chamber 24 and rear bearing chamber 25.Wherein, the fore bearing 26 that is installed in the fore bearing chamber 24 protrudes laterally, and the medial surface of bearing is concordant with the medial surface of fore bearing chamber 24; The rear bearing 27 that is installed in the rear bearing chamber 25 protrudes to the inside, and the lateral surface of bearing is concordant with the lateral surface of rear bearing chamber 25.

Claims

1, a kind of injection-molded stepping motor comprises stator, rotor, rotating shaft, fore bearing and rear bearing, it is characterized in that: the fore bearing chamber and the rear bearing chamber that also comprise injection mo(u)lding; Described stator is electroplated by stator-core lamination, and stator core extremely go up around on behind the copper cash, with the moulding of heat-resistant polyamide PA46 injection moulding parcel; Rotor, fore bearing chamber and rear bearing chamber all are inlaid in the endoporus of stator of injection moulding parcel moulding; Described fore bearing and rear bearing are installed in respectively in the endoporus of fore bearing chamber and rear bearing chamber.

2, injection-molded stepping motor as claimed in claim 1 is characterized in that: fit with the continuous injection-molding surfaces of stator inner hole and link to each other in the outer ring of described rotor, the outer ring of described fore bearing chamber and rear bearing chamber links to each other with the continuous injection-molding surfaces pressing of stator inner hole respectively.

3, injection-molded stepping motor as claimed in claim 1 is characterized in that: also be provided with two outward extending installing holes on the stator of described injection moulding parcel moulding.

4, injection-molded stepping motor as claimed in claim 1 is characterized in that: the thickness of described fore bearing chamber and rear bearing chamber is all less than the thickness of bearing mounted thereto.

5, injection-molded stepping motor as claimed in claim 1 is characterized in that: the described indoor fore bearing of fore bearing that is installed in protrudes laterally, and the medial surface of bearing is concordant with the medial surface of fore bearing chamber; The described indoor rear bearing of rear bearing that is installed in protrudes to the inside, and the lateral surface of bearing is concordant with the lateral surface of rear bearing chamber.

6, injection-molded stepping motor as claimed in claim 1 is characterized in that: described fore bearing is greater than rear bearing.