GB2622603A

GB2622603A - Rotor of electric motor

Info

Publication number: GB2622603A
Application number: GB2213821.8A
Authority: GB
Inventors: Su Jinghui
Original assignee: Dongguan Bluehole Tech Co Ltd
Current assignee: Dongguan Bluehole Tech Co Ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2024-03-27
Also published as: GB202213821D0

Abstract

An electric motor having a housing 1 with a plurality of dividers or vanes (2, Fig. 3), supporting a hollow cylindrical structure (3, Fig. 3) in the centre, which contains a stator 7, and a rotor 5 with an output shaft 501, a permanent magnet 6 supported between two bearings 502, 503, and at one end a fan 8 which has a rear cavity (10). The fan and housing form a ducted fan arrangement. The bearings are supported in sleeves 504, 505 in the hollow cylinder. There is a heat sink (4, Fig. 3) with openings (401, Fig. 3) at the front of the cylinder and channels (402, Fig. 3) terminated at the rear of the cylinder. At the rear of the stator is a circuit board 9, 902 and connector 905, perhaps supported by pins 901 attached to pegs (12, Fig 5) with holes (11, Fig. 5) on the stator, and maybe a second circuit board 904 supported on a further set of pins 903.

Description

ROTOR OF ELECTRIC MOTOR BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to electric motors and more particularly to such an electric motor having an improved rotor and other advantageous characteristics.

2. Description of Related Art

A conventional electric motor of a hair dryer comprises two spring biased bearings disposed at one side and a permanent magnet disposed at the other side. However, in this unbalanced rotation of the electric motor, the fan, the permanent magnet and the output shaft may compromise the functions of the bearings and even damage the bearings. Further, its components are complicated by having springs, pads, and sleeves. Furthermore, reliability is low, noise is unbearable, it is unbalanced, manufacturing cost is relatively high, heat dissipation ability is low, and useful life is decreased.

Thus, the need for improvement still exists.

SUMMARY OF THE INVENTION

The invention has been made in an effort to solve the problems of the conventional art by providing an electric motor having novel and inventive characteristics.

To achieve above and other objects of the invention, the invention provides an electric motor comprising a housing having open front and rear ends; a plurality of equally spaced dividers lengthwise formed with an inner surface of the housing; a hollow cylinder formed with inner ends of the dividers; a heat sink including a plurality of openings disposed on a front end of the hollow cylinder and a plurality of channels connected to the openings and terminated at a rear end of the hollow cylinder; a rotor disposed in a front portion of the cylinder and including an output shaft, a first bearing disposed on a front portion of the output shaft, a second bearing disposed on a rear end of the output shaft, a first sleeve disposed on the first bearing, and a second sleeve disposed on the second bearing; a permanent magnet disposed between the first bearing and the second bearing; a stator disposed around both the output shaft and the permanent magnet; a front fan including a rear cavity fastened on the first sleeve and co-rotated with the output shaft; and a circuit and connection assembly disposed at a rear end of housing, secured to the stator, and electrically connected to the stator.

The invention has the following advantages and benefits in comparison with the conventional art: heat generated in operation can be blown by the fan to flow through the openings and the channels, thereby cooling the stator. Length of the rotor is greatly decreased. Vibration is greatly decreased due to balanced arrangement of components. Robust, reliable and prolonged useful life.

The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electric motor according to the invention; FIG. 2 is an exploded view of the electric motor; FIG. 3 is a view similar to FIG. 1 with both the fan and the circuit and connection assembly removed; FIG. 4 is another perspective view of the electric motor; FIG. 5 is another exploded view of the electric motor; and FIG. 6 is a view similar to FIG. 4 with the circuit and connection assembly removed.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1 to 6, an electric motor of the invention comprises a housing 1 having open front and rear ends; a plurality of equally spaced dividers 2 lengthwise formed with an inner surface of the housing 1; a hollow cylinder 3 formed with inner ends of the dividers 2; a heat sink 4 including a plurality of openings 401 provided on a front end of the cylinder 3 and a plurality of channels 402 connected to the openings 401 and terminated at a rear end of the cylinder 3; a rotor 5 provided in a front portion of the cylinder 3 and including an output shaft 501, a first bearing 502 disposed on a front portion of the output shaft 501, a second bearing 503 disposed on a rear end of the output shaft 501, a first sleeve 504 disposed on the first bearing 502, and a second sleeve 505 disposed on the second bearing 503; a permanent magnet 6 disposed on a central portion of the output shaft 501; a stator 7 provided around both the output shaft 501 and the permanent magnet 6 and including a plurality of equally spaced pegs 12 provided on a rear end and a plurality of holes 11 disposed in the pegs 12 respectively; a front fan 8 including a rear cavity 10 fastened on the first sleeve 504, i.e., the fan 8 being fastened, and the fan 8 being co-rotated with the output shaft 501; and a circuit and connection assembly 9 provided at a rear end of housing 1 and including, from front to rear, a plurality of first pins 901 inserted into the holes 11 respectively to electrically connect to the stator 7, a first printed circuit board (PCB) 902 provided with the first pins 901, a through hole 13 through the first PCB 902 and disposed on the second sleeve 505, a plurality of second pins 903 provided with the first PCB 902, a second PCB 904 provided with the second pins 903, and a port 905 provided with the second PCB 904 for connecting to a power source The invention has the following advantages and benefits in comparison with the conventional art: heat generated in operation can be blown by the fan 8 to flow through the openings 401 and the channels 402, thereby cooling the stator 7. Length of the rotor 5 is greatly decreased. Vibration is greatly decreased due to balanced arrangement of components. Robust, reliable and prolonged useful life.

While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the scope of the appended claims.

Claims

WHAT IS CLAIMED IS: 1 An electric motor comprising: a housing (1) having open front and rear ends; a plurality of equally spaced dividers (2) lengthwise formed with an inner surface of the housing (1); a hollow cylinder (3) formed with inner ends of the dividers (2); a heat sink (4) including a plurality of openings (401) disposed on a front end of the hollow cylinder (3) and a plurality of channels (402) connected to the openings (401) and terminated at a rear end of the hollow cylinder (3); a rotor (5) disposed in a front portion of the hollow cylinder (3) and including an output shaft (501), a first bearing (502) disposed on a front portion of the output shaft (501), a second bearing (503) disposed on a rear end of the output shaft (501), a first sleeve (504) disposed on the first bearing (502), and a second sleeve (505) disposed on the second bearing (503); a permanent magnet (6) disposed between the first bearing (502) and the second bearing (503); a stator (7) disposed around both the output shaft (501) and the permanent magnet (6); a front fan (8) including a rear cavity (10) fastened on the first sleeve (504) and co-rotated with the output shaft (501); and a circuit and connection assembly (9) disposed at a rear end of housing (1), secured to the stator (7), and electrically connected to the stator (7).
2. The electric motor of claim 1, wherein the stator (7) includes a plurality of equally spaced pegs (12) disposed on a rear end and a plurality of holes (11) disposed in the pegs (12) respectively and the circuit and connection assembly (9) includes, from front to rear, a plurality of first pins (901) inserted into the holes (11) respectively to electrically connect to the stator (7), a first PCB (902) secured to the first pins (901), a through hole (13) through the first PCB (902) and disposed on the second sleeve (505), a plurality of second pins (903) secured to the first PCB (902), a second PCB (904) secured to the second pins (903), and a port (905) secured to the second PCB (904).