JPH0139093Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention is an outer rotor type motor in which the through hole of the fixed shaft from which the lead wire of the stator winding is drawn out and the supporting part of the fixed shaft are formed with a simple structure. It relates to an improved product that can be sealed to prevent rainwater from entering.

[Prior art and its problems]

A conventional example of an outer rotor type electric motor will be explained based on FIG. In this figure, a cylindrical rotor 2 surrounding a stator 1 is rotatably supported by a fixed shaft 5 on which the stator 1 is fitted via brackets 3 and 4 connected to both ends of the rotor 2. Fixed axis 5
A disk-shaped support plate 6 that supports the fixed shaft 5 is fitted through a key 7 to the externally projecting end of the rotor. The support plate 6 and the bracket 3 are provided with a labyrinth mechanism that can perform a labyrinth action as the rotor 2 rotates. The fixed shaft 5 has a through hole 5a that communicates with the rotor inner chamber 8 from the end surface on the side of the support plate 6.
is provided, and the lead wire 1b of the stator winding 1a is drawn out through the through hole 5a.
The through hole 5a is sealed by filling the gap between it and the lead wire 1b with a compound 9 such as silicone resin to prevent rainwater, dust, etc. from entering.

Such a structure not only requires a lot of work to fill the compound 9, but also has the disadvantage that rainwater or the like may enter the rotor interior chamber 8 through the key grooves of the support plate 6.

[Purpose of invention]

In order to eliminate the above-mentioned drawbacks, this invention has a simple structure that seals the through hole of the fixed shaft through which the lead wire of the stator winding is drawn out and the supporting part of the fixed shaft to prevent the intrusion of rainwater, etc. An object of the present invention is to provide an outer rotor type electric motor that can perform the following functions.

[Key points of the idea]

In order to achieve the above object, this invention includes a stator fitted with a fixed shaft, a cylindrical rotor surrounding the stator, and a cylindrical rotor coupled to both ends of the rotor to rotate the rotor. a bracket having means for rotatably supporting the child on the fixed shaft; a disc-shaped support plate supporting the fixed shaft at an end projecting outside the machine; and a bracket provided between the support plate and the bracket. A through hole communicating from a side end of the support plate to an inner chamber surrounded by the rotor and the bracket is provided in the fixed shaft, and the stator winding is inserted through the through hole. In an outer rotor type electric motor in which a lead wire is drawn out to the outside of the machine, a waterproof cap made of an elastic material and having a hole for drawing out the lead wire, and the waterproof cap is attached to the support plate from the outer surface of the support plate. It is provided with a tightening plate for fixing.

[Example of idea]

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 2 shows the main parts of the outer rotor type electric motor according to this invention, and parts indicated by the same symbols as in FIG. 1 are the same parts. The electric motor in this figure is the same as in Figure 1 in that it has a labyrinth mechanism between the support plate and the bracket, but it also has a rubber or plastic rubber or other elastic material on the externally projecting end of the fixed shaft 5. By tightening the waterproof cap 29 with a letter-shaped cross section with the tightening plate 30, the waterproof cap 29
The outer circumferential portion of the support plate 26 surrounds the fixed shaft 5 and is fixedly attached by being pressed against the outer surface of the fixed shaft support hole of the support plate 26. At the center of the waterproof cap 29 is a draw-out hole 29 through which the lead-out wire 1b of the stator winding 1a is drawn out.
a is provided, and when the waterproof cap 29 is tightened with the tightening plate 30, the extraction hole 29a and the extraction line 1b are brought into close contact with each other.

[Effect of idea]

As described above, according to this invention, in an outer rotor type electric motor, the stator winding is connected by surrounding the end face of the external protrusion of the fixed shaft and the support hole of the fixed shaft support plate fitted into the protrusion. A waterproof cap made of an elastic material having a lead-out hole for the lead-out wire is passed through the lead-out hole of the waterproof cap, and is pressed and fixed against the outer surface of the support plate. Since the lead wire is drawn out through the through-hole leading to the chamber and the pull-out hole of the waterproof cap, the through-hole of the fixed shaft and the support hole including the key groove, which is the fixed shaft support part of the support plate, can be sealed with a simple structure. do. As a result, it is possible to prevent rainwater and the like from entering the rotor interior from the through-holes to the rotor interior from the lined support holes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional outer rotor type electric motor, and FIG. 2 is a longitudinal sectional view showing essential parts of the outer rotor type electric motor according to this invention. DESCRIPTION OF SYMBOLS 1... Stator, 1a... Stator winding, 1b... Lead wire, 2... Rotor, 3, 4... Bracket, 5... Fixed shaft, 5a... Through hole, 8... Rotor interior, 26... Support plate, 29...Waterproof cap, 29a...Drawer hole, 3
0...Tightening plate.

Claims (1)

[Claims for Utility Model Registration] A fixed shaft 5 and a stator 1 fitted to the fixed shaft
, a cylindrical rotor 2 surrounding the stator, and brackets 3 and 4 connected to both ends of the rotor, respectively. The rotor 2 is provided with a bearing portion that rotatably supports the rotor 2 on the fixed shaft 5, and the fixed shaft 5 has one end protruding from the corresponding bracket 3 to the outside of the machine, and forms a circle at the end projecting outside the machine. It is supported by a plate-shaped support plate 6, and this support plate 6 and the bracket 3 on the side of the support plate form a labyrinth mechanism with their opposing surfaces. A through hole 5a communicating with the rotor inner chamber 8 is provided from the side end, and a lead wire 1b of the stator winding is led out of the machine through the through hole 5a.A lead hole for the lead wire 1b is provided. A waterproof cap 29 made of an elastic material having 29a and a tightening plate 30 for fixing the waterproof cap 29 to the support plate 6 from the outer surface of the support plate are provided;
An outer rotor type electric motor featuring: