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Synchronous rotating electric machine with permanent magnets and flux concentration

A technology of rotating electrical machines and permanent magnets, which is applied to synchronous motors with stationary armatures and rotating magnets, synchronous machine parts, magnetic circuit rotating parts, etc., and can solve problems such as magnet demagnetization

Active Publication Date: 2011-10-05
VALEO EQUIP ELECTRIC MOTEUR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, demagnetizing flux in motors with permanent magnets has a risk of demagnetizing the magnets, an even greater risk when the magnets are hot
Concentrating motors are particularly susceptible to this risk of demagnetization due to the placement of the magnets of these motors in the rotor

Method used

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  • Synchronous rotating electric machine with permanent magnets and flux concentration
  • Synchronous rotating electric machine with permanent magnets and flux concentration
  • Synchronous rotating electric machine with permanent magnets and flux concentration

Examples

Experimental program
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Embodiment Construction

[0027] figure 1 The structure of Specific Embodiment 1 of the defluxable rotating electric machine according to the present invention is shown. The motor 1 is of the type with hidden magnets and magnetic concentration and includes a stator 10 and a rotor 11 .

[0028] A specific embodiment of such an electric machine according to the invention is, for example, a traction motor of 8 to 10 KW applied to motor vehicles of the type known as "mild hybrid". This particular embodiment of the motor comprises a stator 10 having 60 recesses 101 and a rotor 11 comprising 10 alternating north and south poles. The rotor 11 has a diameter of the order of 100 mm and an axial length of the order of 50 mm. The rotor 11 includes 10 permanent magnets PM having a substantially rectangular shape and having a dimension: length (L zs ) × height (h a )×width (I a ) = 50 mm × 25 mm × 5 mm.

[0029] The stator 10 and the rotor 11 are conventionally equipped with a sheet metal pack forming the mag...

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PUM

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Abstract

The invention relates to a synchronous rotating electric machine with permanent magnets and flux concentration. The electric machine in the invention comprises a stator (10) and a rotor (11). The rotor which is of a flux concentration type comprises a plurality of alternating N poles and S poles which are formed by permanent magnets (PM). The permanent magnets are accommodated in grooves (E1) equipped in the magnetic main body of the rotor. According to the invention, the rotor comprises a magnetic circuit for defluxing magnetic flux to circulate. The magnetic circuit comprises a defluxing magnetic flux resistance (Rf) determined by a function of an internal magnetic resistance (Ra) of the magnets so as to ensure that the ratio (Rf / Ra) of the defluxing magnetic flux resistance to the internal magnetic resistance (Ra) of the magnets is within a preset-value range of offsetting the demagnetizing risks. According to the type of the magnets, the range of the preset value is approximately between 0.3 and 3.

Description

technical field [0001] The present invention relates to a synchronous rotating electrical machine with permanent magnets and flux concentration. More particularly, the invention relates to rotating electric machines of this type for applications such as generators or electric traction motors in electric or hybrid vehicles. Background technique [0002] Synchronous motors with permanent magnets are now widely used in the traction field of motor vehicles due to improved performance in terms of output and power-to-weight ratio and power-to-volume ratio. Furthermore, the availability of rare earth permanent magnets in large quantities and under acceptable economic conditions makes this electric motor option a viable option for new generations of motor vehicles. [0003] Such electric motors can be produced in a wide range of powers and speeds and will be low CO in all-electric vehicles of the type known as "mild-hybrid" and "full-hybrid" 2 applied in vehicles. [0004] "Mild ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/12H02K21/02H02K1/27
CPCH02K1/2773H02K21/14H02K2213/03
Inventor 让-克劳德.马特杰罗姆.勒格兰格
Owner VALEO EQUIP ELECTRIC MOTEUR
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