CN2402054Y

CN2402054Y - Low voltage brushless dc motor

Info

Publication number: CN2402054Y
Application number: CN 99256035
Authority: CN
Inventors: 范毅; 张怀国; 刘继辉; 秦乃军; 林信锦
Original assignee: Midea Group Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 1999-12-14
Filing date: 1999-12-14
Publication date: 2000-10-18
Anticipated expiration: 2009-12-14

Abstract

The utility model relates to a low voltage brushless DC motor, which adopts a direct plastic package way to manufacture integration rotors. The utility model comprises a stator, an outer rotor, a front end cap, a rear end cap, and a built-in PC controlling circuit. An iron core of the stator is riveted with the end caps after the iron core is positioned in grooves of the front or the rear end cap; the front and the rear end caps are assembled by adopting the buckle riveting way; the PC controlling circuit is installed on a special boss which is formed the end caps by punch forming. The utility model which eliminates casings of a motor has the advantages that the installaion and disassembly of the iron core and the end caps are convenient, the process of the assembling is reduced, production efficiency is enhanced, the cost is reduced, and the utility model is convenient for process and maintenance.

Description

The low pressure brushless DC motor

The utility model relates to a kind of built-in brushless DC motor, is meant a kind of outer-rotor type low pressure brushless DC motor that adopts disposable plastic packaging rotor especially.

Existing commercially available external rotor electric machine generally adopts annotates the aluminium rotor, in the processing supporting Aluminum press casting apparatus need be arranged, the manufacturing procedure route is that stamping rotor punching, rotor punching laminate moulding, high temperature is annotated aluminium, turning processing, though this operation tradition, reliable, but efficient is lower, processing technology is complicated, produces in enormous quantities with modernized factory not to be complementary, when especially high temperature is annotated aluminium, high temperature and production environment are very big to people's physical effects, belong to the high strength operation.In the conventional motors structure, stator adopts on the support usually and locatees, and then end cap is fixed by screw, though this method is stable, seems clumsy for low-power machine, is unfavorable for miniaturization; And adopt interference fit between end cap and iron core, and iron core is pressed in the end cap, make installation and removal inconvenience.

The purpose of this utility model provides a kind of compact conformation, can fully satisfy requirements of mass production, assembles easily the outer-rotor type low pressure brushless DC motor of the disposable plastic packaging rotor that manufacturing procedure technology obtains simplifying.

To achieve these goals, the utility model low pressure brushless DC motor has adopted following structure, comprise End cover for motor, be positioned at machine stator, external rotor, be fixed on PC control circuit on the casing in built-in mode, its external rotor around the stator rotation adopts integral structure, by the plastic packaging technology together with armature spindle and permanent magnet rotor plastic packaging, rotor block is cup-shaped, and there is the axle sleeve of protrusion the center.The iron core of the stator that is centered on by external rotor is placed in the end cap groove, with the riveting of end cap button together.And end cap comprises front end housing, rear end cap, and front end housing leaves at the end cap edge and cooperate, the rough technology hasp of projection on the rear end cap.Be useful on the end cap built-in PC control circuit board, stamping forming positioning boss is installed.

Compared with prior art, the utility model rotor disposable straight forming of injection molding machine, the machining accuracy height has greatly reduced rotor weight, and high-axiality is beated the cylindrical of rotor and is controlled fully; Simplify procedure technology, improved production efficiency, satisfied requirement of mass production; Compact conformation, complete machine thickness are little, and be directly involutory between the end cap, omitted electric machine casing, and iron core directly is assemblied on the end cap, and installation, convenient disassembly have reduced assembly process between the end cap, have improved production efficiency, both reduced cost, and be convenient to processing and maintenance again, and improved operational reliability.

The utility model is described in further detail below in conjunction with accompanying drawing.

Accompanying drawing 1 is that assembling master of the present utility model looks schematic diagram; Accompanying drawing 2 is that the assembling master of rotor of the present utility model and armature spindle looks schematic diagram; Accompanying drawing 3 (1) is a front end housing complete section schematic side view of the present utility model, and (2) are the local enlarged diagrams of front end housing technology hasp; Accompanying drawing 4 (1) is that rear end cap master of the present utility model looks schematic diagram, and (2) are for the local enlarged diagram of the boss that wiring board is installed on the rear end cap; Accompanying drawing 5 is core configuration schematic diagrames of the present utility model; Accompanying drawing 6 is rear end cap of the present utility model and iron core assembling schematic diagram; Accompanying drawing 7 is rear end cap of the present utility model and wiring board scheme of installation.

With reference to accompanying drawing.The utility model comprises cup-shaped permanent magnet rotor 1, the armature spindle 14 of rotor center, bearing 5 location of armature spindle by being fixed on the front and rear cover middle part, the stator 2 that is centered on by rotor, stator is buckled riveting on end cap, front end housing 12 and rear end cap 4 are directly locked by hasp, are equipped with on the inboard boss of rear end cap with the fixing PC plate 8 of screw 9, and Hall element 10 is arranged on the PC plate.For guaranteeing to run well, shaft block ring 7 and plain washer 6, wavy spring packing ring 13 are housed at the bearing place, on front and rear cover, be with vibration-proof rubber circle 3 in addition, and power line 11.

The utility model adopts built-in type of drive.During use, after built-in PC plate passes to direct current, come six power tubes on the control board, make it that the border is logical in turn, reach the purpose that the stator winding commutation forms rotating magnetic field by Hall element induction permanent magnet rotor position.During design, leave the rough technology hasp that cooperates with projection on the bonnet at the front end housing edge, this cooperation is the matched in clearance of being convenient to assemble, and assemble the back with the riveting of special tooling button, both has been convenient to operation, has improved production efficiency again; Iron core and end cap adopt the riveting mode, are about to detain riveting after iron core is put into the end cap groove, and iron core and end cap are fixed.In brshless DC motor, the position of wiring board is the key of motor operation, and the malposition of wiring board will cause the malposition of Hall element and permanent magnet rotor, thereby circuit can't be worked.With screw wiring board is fixed on the rear end cap in the utility model, not only simple in structure, connect reliably, and the mechanical positioning by end cap and wiring board makes the wiring board location accurately.

Claims

1, a kind of low pressure brushless DC motor, comprise End cover for motor, be positioned at machine stator (2), external rotor (1), be fixed on PC control circuit (8) on the casing in built-in mode, it is characterized in that adopting integral structure around the external rotor of stator rotation, by the plastic packaging technology together with armature spindle and permanent magnet rotor plastic packaging, rotor block is cup-shaped, and there is the axle sleeve of protrusion the center.

2, motor as claimed in claim 1 is characterized in that the iron core of the stator that centered on by external rotor is placed in the end cap groove, with the riveting of end cap button together.

3, motor as claimed in claim 2 is characterized in that described end cap comprises front end housing (12), rear end cap (4), and front end housing leaves at the end cap edge and cooperate, the rough technology hasp of projection on the rear end cap.

4,, it is characterized in that being useful on the end cap built-in PC control circuit board, the stamping forming positioning boss of installation as claim 2 or 3 described motor.