CN1925279A

CN1925279A - Motor device

Info

Publication number: CN1925279A
Application number: CNA2005100936718A
Authority: CN
Inventors: 沈岳
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-09-01
Filing date: 2005-09-01
Publication date: 2007-03-07
Anticipated expiration: 2025-09-01
Also published as: CN100505481C

Abstract

This invention relates to motor, which comprises shell, rotation axis and multiple sub motors, wherein, each axis passes shell inside with two ends connected to shell; the said multiple sub-motor has common axis with at least sub motors with one motor highest speed equal to other sub motor.

Description

Electric machine

Technical field

The present invention relates to a kind of electric machine.

Background technology

Electric machine provides the vitals of power.Therefore generally speaking, the commercial power machine all is operated in nominal torque, and this electric machine only needs have very high efficient at the nominal torque point and gets final product.And in electric motor car when operation, require electric machine can keep higher power output under the situation of the little moment of torsion of high rotating speed, and efficient is higher like this.The prior motor device, the double-rotor structural apparatus for motor of little, the energy savings of disclosed a kind of starting duty among the CN1348247A for example, fixedly mounting rotor on the main shaft, it is characterized in that: dual-rotor structure is installed in the casing, two rotors are fixed on respectively on the rotating shaft, and the birotor axle is positioned on the same axial line, and birotor places the both sides of stator respectively, fixing on the two-spool corresponding surface and contain magnet, stator is fixed on the casing.The efficacious workaround of existing motor of electric motor car device is arranged in, slow-speed of revolution district, and the working point under the situation of the little moment of torsion of high rotating speed is far away apart from efficacious workaround, can not reach efficient output.Therefore need to improve the efficient of electric machine under high rotating speed, little torque condition, to be fit to the needs of electric motor car.

Summary of the invention

The object of the present invention is to provide a kind of guarantee electric machine under the prerequisite of the little moment of torsion of high rotating speed running, the working point is apart from the nearer motor of electric motor car device of efficacious workaround.

Electric machine provided by the invention comprises casing, rotating shaft and a plurality of sub-motor, described rotating shaft runs through casing inside and rotating shaft two ends and casing and is rotationally connected, described a plurality of sub-motor has common rotating shaft, and have two sub-motors in a plurality of sub-motors at least, the maximum speed of a sub-motor in these two sub-motors equates with the rated speed of another one sub-motor.

Electric machine provided by the present invention is by using coaxial sub-motor, make a plurality of sub-motors unite output, thereby the efficacious workaround of a plurality of sub-motors is connected mutually, thereby enlarged the efficacious workaround of whole electric machine, made that electric machine working point under the condition of the little moment of torsion of high rotating speed is nearer apart from efficacious workaround.When electric machine was in slow-revving operating state, a plurality of sub-motors moved simultaneously, and bigger moment of torsion can be provided, for automobile provides bigger tractive effort; When electric machine was in high-revolving operating state, this moment, moment of torsion was less, the higher sub-motor operation output of rated speed in a plurality of sub-motors, and this moment, the working point was positioned at the efficacious workaround of the sub-motor that is moved, and delivery efficiency is higher.So electric machine provided by the present invention still can guarantee higher running efficiency under the condition of the little moment of torsion of high rotating speed, to satisfy the need of work of electric vehicle motor device.In addition, the compact conformation of electric machine provided by the present invention is convenient to control.

Description of drawings

Fig. 1 is the structural profile schematic diagram of an embodiment of electric machine provided by the present invention;

Fig. 2 is according to first sub-motor of the illustrational electric machine provided by the present invention of the described embodiment of Fig. 1, the output characteristic curve figure of second sub-motor;

Fig. 3 is the output characteristic curve figure of illustrational electric machine of the present invention.

Embodiment

Electric machine provided by the invention comprises casing 1, rotating shaft 9 and a plurality of sub-motor, described rotating shaft 9 runs through casing 1 inside and rotating shaft 9 two ends and casing 1 and is rotationally connected, described a plurality of sub-motor has common rotating shaft 9, and have two sub-motors in a plurality of sub-motors at least, the maximum speed of a sub-motor in these two sub-motors equates with the rated speed of another one sub-motor.

Described another one sub-motor is the highest sub-motor of rated speed in a plurality of sub-motors, thereby still can guarantee electric machine output when rotating speed is very high.

Under the preferable case, described a plurality of sub-motors are arranged from low to high according to rated speed, and the maximum speed and the rated speed of two sub-motors that the rated speed of a sub-motor and maximum speed are adjacent with it respectively equate.Like this, the rated speed and the maximum speed of a plurality of sub-motor can be connected successively mutually.

More preferably under the situation, the nominal torque of described a plurality of sub-motors equates that the output characteristic curve of a plurality of like this sub-motors is more level and smooth when being connected, and effect is even more ideal when uniting output.

Described a plurality of sub-motor is driven by the self-corresponding frequency converter of same frequency converter or each, described frequency converter select for use for those skilled in the art known.Use same frequency converter to drive under the preferable case, like this can the simplified apparatus structure, save cost, also be convenient to control simultaneously.

Described a plurality of sub-motor can be applicable to coaxial electric machine for known any of those skilled in the art.Under the preferable case, take up space in order to reduce electric machine, embodiment as shown in Figure 1, described a plurality of sub-motor refers to two sub-motors, be first sub-motor and second sub-motor, described first sub-motor comprises first stator 3 and the first rotor 5 relative with first stator 3, described second sub-motor comprises second stator 4 and second rotor 6 relative with second stator 4, described first stator 3 and second stator 4 are fixed in described casing 1 inwall, and described the first rotor 5 is through in the rotating shaft 9 and with rotating shaft 9 with second rotor 6 fixedlys connected.

For the ease of rotating, the shape of described first stator 3 and second stator 4 is preferably cross section and is annular.As those skilled in the art were known, described first stator 3 and second stator, 4 inside had coil, and the material of coil is that those skilled in the art are known, as selecting in copper, silver, the aluminium one or more for use, were preferably copper.

As those skilled in the art are known, the described the first rotor 5 and second rotor 6 have magnet towards the one side of first stator 3 and second stator 4, the material of magnet is that those skilled in the art are known, select in rare-earth cobalt permanent magnet, casting Al-Ni-Co permanent magnet, the Agglutinate neodymium-iron-boron magnetic one or more for use, be preferably Agglutinate neodymium-iron-boron magnetic.

Be spaced from each other between described first sub-motor and second sub-motor, can avoid the interference between the sub-motor like this, save cost simultaneously.

Those skilled in the art can be according to the output characteristic of required motor device, in conjunction with the first definite sub-motor of the present invention and the output characteristic (being rated speed and maximum speed) of second sub-motor, and then determine the suitable stator and the structure and the size of rotor, do not do special qualification at this.

The shape of described casing 1 can be any one shape, is preferably cylindrical housings to save the space.

The material of described casing 1 is that those skilled in the art are known, is preferably aluminium alloy or steel.

Being rotationally connected of described rotating shaft 9 two ends and described casing 1 can be selected the known mode that is rotationally connected of those skilled in the art for use, also comprises bearing 7 for described electric machine under the preferable case, is positioned at the two ends of rotating shaft 9, makes between rotating shaft 9 and the casing 1 to be rotationally connected.

One end of described rotating shaft 9 protrudes casing 1, provides transmission power so that link to each other with vehicle drive shaft, and the other end is concordant with described bearing 7, and utilizes end cap 8 to seal to have reached effect dustproof, that seal.

Overheated for fear of electric machine, between a plurality of sub-motors and casing 1, can also comprise cooling layer 2, described cooling layer 2 can be the water jacket or the known cooling means of other those skilled in the art of sealing.

In the present embodiment, the rated speed of first sub-motor is lower, and its maximum speed equates with the rated speed of second sub-motor.Referring to figs. 2 and 3, the output characteristic curve of first sub-motor is shown in curve A among Fig. 2, rated speed is that 2000 rev/mins, maximum speed are that 4000 rev/mins, nominal torque are 100 Ns of rice, the output characteristic curve of second sub-motor is shown in curve B among Fig. 2, rated speed is that 4000 rev/mins, maximum speed are that 8000 rev/mins, nominal torque are 100 Ns of rice, has so just satisfied the requirement of electric machine provided by the present invention.First sub-motor and second sub-motor are united output, and the output characteristic that obtains electric machine provided by the present invention is shown in curve C among Fig. 3, that is: rated speed is that 2000 rev/mins, maximum speed are that 8000 rev/mins, nominal torque are 200 Ns of rice.

If adopting independent rated speed is that 2000 rev/mins, maximum speed are that 8000 rev/mins electric machine is when reaching output characteristic shown in Figure 3, its efficacious workaround is arranged in 2000 rev/mins to 4000 rev/mins these sections, and then efficient is lower when electric machine is in high rotating speed.And present embodiment adopts a plurality of coaxial sub-motors to unite output, when electric machine is in the slow-speed of revolution (2000 rev/mins to 4000 rev/mins), first sub-motor and second sub-motor move simultaneously, and bigger moment of torsion can be provided, and are positioned at efficacious workaround this moment; When electric machine is in high rotating speed (4000 rev/mins to 8000 rev/mins), owing to surpassed the maximum (top) speed of first sub-motor, so only by the second sub-motor power output, first sub-motor is driven still not power output by second sub-motor, this moment, the electric machine working point was positioned at the efficacious workaround of second sub-motor, high efficiency.The output of uniting by first sub-motor and second sub-motor, make the efficacious workaround of electric machine increase greatly, thereby make electric machine under the prerequisite of the little moment of torsion running of high rotating speed, the working point is nearer apart from efficacious workaround, has satisfied the need of work of electric vehicle motor device.

Claims

1. electric machine, wherein, this electric machine comprises casing, rotating shaft and a plurality of sub-motor, described rotating shaft runs through casing inside and rotating shaft two ends and casing and is rotationally connected, described a plurality of sub-motor has common rotating shaft, and have two sub-motors in a plurality of sub-motors at least, the maximum speed of a sub-motor in these two sub-motors equates with the rated speed of another one sub-motor.

2. according to the described electric machine of claim 1, wherein, described another one sub-motor is the highest sub-motor of rated speed in a plurality of sub-motors.

3. according to the described electric machine of claim 1, wherein, described a plurality of sub-motors are arranged from low to high according to rated speed, and the maximum speed and the rated speed of two sub-motors that the rated speed of a sub-motor and maximum speed are adjacent with it respectively equate.

4. according to the described electric machine of claim 1, wherein, the nominal torque of described a plurality of sub-motors equates.

5. according to the described electric machine of claim 1, wherein, described a plurality of sub-motors are driven by same frequency converter or each self-corresponding frequency converter.

6. according to the described electric machine of claim 1, wherein, described a plurality of sub-motor refers to two sub-motors, be first sub-motor and second sub-motor, described first sub-motor comprises first stator and the first rotor relative with first stator, described second sub-motor comprises second stator and second rotor relative with second stator, and described first stator and second stator are fixed in described casing inner wall, and described the first rotor is through in the rotating shaft and with rotating shaft with second rotor fixedlys connected.

7. according to the described electric machine of claim 6, wherein, the cross section of described first stator and second stator is an annular.

8. according to the described electric machine of claim 6, wherein, be spaced from each other between described first sub-motor and second sub-motor.

9. according to the described electric machine of claim 1, wherein, described electric machine also comprises bearing, is positioned at the two ends of rotating shaft.

10. according to the described electric machine of claim 1, wherein, described electric machine also comprises cooling layer, between a plurality of sub-motors and casing.