WO2018101859A2

WO2018101859A2 - Electrical machine

Info

Publication number: WO2018101859A2
Application number: PCT/RU2017/000887
Authority: WO
Inventors: Александр Андреевич Панин
Original assignee: Александр Андреевич Панин
Priority date: 2016-12-02
Filing date: 2017-12-01
Publication date: 2018-06-07
Also published as: WO2018101859A3

Abstract

The invention relates to electrical engineering, and concerns reversible electrical machines which function both as electric generators and as electric motors, primarily in automotive vehicles. In an electrical machine comprising a housing, a stator, a rotor coaxially encompassing the stator, wherein the rotor is connected to an output shaft mounted on rolling bearings in the stator such that one end projects in cantilever fashion out of the housing, and a fan, the rotor is in the form of a cylindrical barrel with permanent magnets arranged on the inside surface thereof, and an end cover fastened to the output shaft, wherein the vanes of the fan are formed on the cover, coaxially with the output shaft, and outlet ventilation ports are provided in the cover, close to the shaft, the axes of said ports forming an acute angle with the axis of the shaft, wherein the barrel is seated at its open end on a rolling bearing mounted in the housing, and inlet ventilation ports are provided in the barrel, upstream of the stator. This results in the possibility of reducing aerodynamic losses as cooling air flows over the rotor and stator of the electrical machine.

Description

ELECTRIC MACHINE

Application area

The invention relates to electrical engineering and, in particular, to reversible electric machines operating both in the electric generator mode and in the electric motor mode, mainly in automotive engineering, and can find application where a source of electric current or mechanical energy is needed.

State of the art

An electric machine is known comprising a housing, a stator, the windings of which are connected to an electric current source, and a rotor mounted on a shaft coaxially enclosing the stator, the rotor being connected to the shaft, and the latter mounted on rolling bearings in the stator with an end cantilever protruding from the housing (see TW patent

class Н02К 5/08, publ. 08/16/2016).

However, the lack of means for removing heat from a working electric machine reduces the possibility of its use, since when operating at maximum power, the electric machine can overheat and fail.

The closest to the invention in technical essence and the achieved result is an electric machine comprising a housing, a stator, the windings of which are connected to an electric current source, and a fan impeller mounted on the shaft and a rotor coaxially surrounding the stator, the rotor being connected to the shaft, and the latter It is mounted on rolling bearings in a stator with an end cantilever protruding from the housing (see GB Patent No. 622441, CL H2K 7/112, publ. 05/02/1949).

This electric machine provides heat removal from a working electric machine. However, the implementation of the fan in the form of an independent structural element leads to the complexity of the design while increasing its size. Besides,

one

SUBSTITUTE SHEET (RULE 26) significant aerodynamic losses during the flow around the rotor and stator reduce the cooling efficiency of the electric machine.

Disclosure of invention

The technical problem is the elimination of deficiencies identified in the analogues. The technical result is that it is possible to reduce aerodynamic losses when the cooling air flows around the rotor and stator of an electric machine.

This problem is solved, and the technical result is achieved due to the fact that in an electric machine containing a housing, a stator, a rotor coaxially covering the stator, the rotor is connected to the output shaft, and the latter is mounted on rolling bearings in the stator with an end cantilever protruding from the housing and the fan, rotor is made in the form of a cylindrical shell with permanent magnets located on its inner surface and an end cap fixed to the output shaft, and the fan blades are made on the cap to the output shaft axially and in a cover made closer to the shaft output ventilation openings whose axes form an acute angle with the axis of the shaft, wherein the shell is on the open side is fitted to a rolling bearing mounted on the housing, and a shell formed prior to a stator inlet vents.

The design of the electric machine described above makes it possible to create a substantially smooth annular gap between the rotor and the stator, which, in combination with the outlet ventilation openings in such a way that their axes form an acute angle with the shaft axis, allows the flow of cooling air along the rotor to be organized with minimal aerodynamic losses and stator, and mounting the shell on a rolling bearing mounted on the housing, can dramatically reduce the vibration of the rotor during operation of the electric machine and maintain the same the size of the gap between the rotor and the stator, which also allows to reduce aerodynamic losses for cooling air flowing between the rotor and the stator.

Brief Description of the Drawings

Figure 1 presents a longitudinal section of an electric machine. The best embodiment of the invention

2

SUBSTITUTE SHEET (RULE 26) The electric machine includes a housing 1, a stator 2 with windings 3, an output shaft 4, fan blades 5. The rotor 6 coaxially encompasses the stator and is connected to the output shaft 4, and the latter is mounted on rolling bearings 7 in the stator with an end cantilever protruding from the housing. The rotor 6 is made in the form of a cylindrical shell 8 with permanent magnets 9 located on its inner surface and an end cap 10 mounted on the output shaft, and the fan blades are made on the cover coaxially to the output shaft and the outlet vents 1 1 are made in the cover closer to the shaft, axes which form an acute angle with the axis of the shaft, while the shell on the open side is seated on a rolling bearing 12 mounted on the housing, and the inlet vents 13 are made in the shell in front of the stator.

When the electric machine is operating while the rotor rotates around the stator 2, the fan blades 5 create a flow of cooling air that enters through the ventilation inlets 13, passes through the annular gap between the rotor 6 and the stator 2, and then through the fan blades 5, the cooling air exits through the ventilation vents 1 1 out of the car.

Industrial applicability

The invention provides efficient heat removal from a working electric machine with minimal energy consumption for organizing the flow of cooling air between the rotor and stator.

s

SUBSTITUTE SHEET (RULE 26)

Claims

Claim

An electric machine comprising a housing, a stator, a rotor coaxially enclosing the stator, wherein the rotor is connected to the output shaft, and the latter is mounted on rolling bearings in the stator with an end cantilever protruding from the housing, and a fan, characterized in that the rotor is made in the form of a cylindrical shell with permanent magnets located on its inner surface and an end cap fixed to the output shaft, the fan blades being made coaxially on the cover of the output shaft and in the cover closer to the shaft dnye ventilation openings whose axes form an acute angle with the axis of the shaft, wherein the shell is on the open side is fitted to a rolling bearing mounted on the housing, and a shell formed prior to a stator inlet vents.

four

SUBSTITUTE SHEET (RULE 26)