CN201422069Y

CN201422069Y - Five-phase direct-current brushless motor for electric vehicle

Info

Publication number: CN201422069Y
Application number: CN2009201481200U
Authority: CN
Inventors: 梁耀
Original assignee: MINGTAI MACHINERY MANUFACTURE CO Ltd
Current assignee: MINGTAI MACHINERY MANUFACTURE CO Ltd
Priority date: 2009-04-09
Filing date: 2009-04-09
Publication date: 2010-03-10
Anticipated expiration: 2019-04-09

Abstract

The utility model discloses a five-phase direct-current brushless motor for an electric vehicle. The brushless motor aims to solve the problems of low efficient motor, small torsion, high cost and thelike of motors in the prior art, and comprises a stator with five-phase star-connection windings and a rotor rotating relatively to the windings, and the windings change phases at a position responding the rotation of the rotor. By adopting the structure, the five-phase windings shift constantly, accordingly, at least four-phase windings work simultaneously, rotating speed of the motor is unableto be reduced remarkably when entering a saturation state, torsion of the motor can be larger than that of a common three-phase motor; the motor has small torque ripple; loading is started directly without reducing speed, thereby the brushless motor has quick reaction speed, is capable of producing large enough torque when in locked rotation and at low speed, has stable running without damaging the motor and a controller, has excellent starting performance; the brushless motor avoids troubles of keeping an angle at 90 degrees between electromagnetic torque and magnetic steel pole owing to winding conversion.

Description

The five phase DC brushless motor that is used for electric motor car

Technical field

The utility model relates to a kind of dc brushless motor, particularly is used for the five phase DC brushless motor of electric motor car.

Background technology

Along with development of market economy, the consumer is more and more higher to the cognitive ability and the requirement of product at present, because the requirement height in market, raising electric efficiency and torque so motor manufacturer in various places is also attempting ining all sorts of ways when constantly weeding out the old and bring forth the new.As adopt increase magnet steel magnetic flux, and change spindle thickness, change spindle and hub diameter etc.Certainly above the whole bag of tricks also can solve the problem of certain aspect.But the factor that is restricted is also many, the control that magnet steel magnetizes, and very big thereby the increase of spindle thickness makes weight be increased in the absolute value of when starting moment of inertia, starting current is bigger, and the quality of position transducer and KZQ controller is bigger.Increase spindle and hub diameter and can make that again production cost increases substantially.

The utility model content

In order to overcome above-mentioned defective, the purpose of this utility model is to provide a kind of high rotating speed, high pulling torque, winding utilization is higher and cost the is relatively low five phase DC brushless motor that is used for electric motor car.

In order to achieve the above object, the five phase DC brushless motor that is used for electric motor car of the present utility model comprises stator with five phase Y-connection windings and forms with respect to described winding rotor rotated that described winding is in the position of rotation commutation of response rotor.

Particularly, also comprise five position transducers and the controller that is connected respectively with described position transducer, position transducer is transformed into signal with the position of rotation of rotor and passes to controller, described controller is according to each the phase winding predetermined order conducting of the described stator of signal controlling that receives, and the stator phase current is pressed predetermined order commutation with the position of rotation variation of rotor.

Wherein, the conducting order of described each phase winding and described rotor rotation angle are synchronous.

Further, described rotor is made up of 42 magnet steel or 48 magnet steel.

Further, described stator circumferentially is provided with 45 grooves.

Above-mentioned structure, because the alternate continuous switching of winding when work, so can obtain four phase windings at least works simultaneously, the obvious step-down of rotating speed meeting when common three phase electric machine enters saturation condition, and moment of torsion is also less, and five-phase induction motor rotating speed when entering saturation condition can obviously not descend, and moment of torsion also can be bigger by about 20% than common three phase electric machine, so winding utilization is improved, electric efficiency further improves; Because this motor adopts five phase windings, so whole spindle all adopts the short distance winding, motor is when nominal torque, rotor torque change amount on diverse location is very big, especially when the slow-speed of revolution, more be easy to generate torque pulsation, electric bicycle just belongs to Low speed electric motor with motor itself, and five-phase induction motor has adopted polyphase windings just, many torque pulsation problem is solved in magnetic field; Can load without the deceleration across-the-line starting, reaction speed is fast, electro mechanic time constant is little, be about tens to a few tens of milliseconds, can under stall and low speed, move, can produce enough big torque under the stall situation and do not damage motor and controller, also can even running under very low rotating speed, to be that per minute is several go to tens fluctuations of speed when changeing and only account for about 5% of total rotating speed rotating speed, and starting performance is good; The winding change of current has been avoided because general electric bicycle is many with the outer motor of turning in, and the magnet steel rotating part will keep electromagnetic torque and magnet steel magnetic pole to be mutually the puzzlement of an angle of 90 degrees.

Description of drawings

Fig. 1 is five phase winding syndeton schematic diagrames of specific embodiment of the utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described.

As shown in Figure 1, the five phase DC brushless motor that is used for electric motor car of the present utility model comprises stator with five phase Y-connection windings 1 and forms with respect to described winding rotor rotated that described winding is in the position of rotation commutation of response rotor.

The five phase DC brushless motor that is used for electric motor car of said structure, because alternate continuous switching when work, so can obtain four phase windings at least works simultaneously, the course of work is, be that four phase windings are worked simultaneously at every turn, last bridge two-phase, following bridge two-phase draws upper and lower bridge conducting truth table according to corresponding position transducer decoding.The course of work of comparing three phase electric machine be each two-phase work and upper and lower bridge each one be conducted, its margin of power and the situation that enters the saturation region have raising by a relatively large margin.The obvious step-down of rotating speed meeting when common three phase electric machine enters saturation condition, and moment of torsion is also less, and five-phase induction motor rotating speed when entering saturation condition can obviously not descend, and moment of torsion also can be bigger by about 20% than common three phase electric machine, so winding utilization is improved, electric efficiency further improves; Secondly because this motor adopts five phase windings, so whole spindle all adopts the short distance winding, motor is when nominal torque, rotor torque change amount on diverse location is very big, especially when the slow-speed of revolution, more be easy to generate torque pulsation, electric bicycle just belongs to Low speed electric motor with motor itself, and five-phase induction motor has adopted polyphase windings just, many torque pulsation problem is solved in magnetic field; Moreover the five phase DC brushless motor that is used for electric motor car can be loaded without the deceleration across-the-line starting, because the five-phase induction motor operation principle is for being that four phase windings are worked simultaneously at every turn, and upper and lower bridge respectively has two groups of windings to work simultaneously, the location moment of torsion of the former three phase electric machine simplex winding of its location torque ratio work is wanted big nearly 10N.M, so but general electric motor car high-speed starting.Reaction speed is fast, electro mechanic time constant is little, can reach tens to a few tens of milliseconds, can under stall and low speed, move, enough big torque be can produce under the stall situation and motor and controller do not damaged, even also can even running under very low rotating speed, total to be per minute several goes to tens fluctuations of speed when changeing and only account for about 5% of rotating speed for rotating speed, starting performance be good; The last winding change of current is avoided because general electric bicycle is many with the outer motor of turning in, and the magnet steel rotating part will keep electromagnetic torque and magnet steel magnetic pole to be mutually the puzzlement of an angle of 90 degrees.

As specific embodiment of the utility model, also comprise five position transducers and the controller that is connected respectively with described position transducer, position transducer is transformed into signal with the position of rotation of rotor and passes to controller, described controller is according to each the phase winding predetermined order conducting of the described stator of signal controlling that receives, and the stator phase current is pressed predetermined order commutation with the position of rotation variation of rotor.Simple in structure, reliable, easy to maintenance, operational efficiency is high.

Five phase DC brushless motor of the present utility model, rotor is made up of 42 magnet steel or 48 magnet steel, corresponding stator circumferentially is provided with 45 grooves, thereby form 42 extremely to 45 grooves or 48 extremely to 45 groove motors, following advantage is arranged: 1, motor is the fractional-slot motor, thereby starting torque is big the pulsation moment of torsion little and shake little, steadily.2, magnetic circuit is even, every phase nine grooves, and Distribution of Magnetic Field is even, and the winding arrangement is reasonable, not only can boost productivity but also can improve system effectiveness.

Present domestic electric motor car industry generally adopts three-phase brushless dc motor, and five-phase induction motor will be higher than three phase electric machine in the frequency of circuit aspect adopting.The five-phase induction motor course of work is on two, twice windings are worked simultaneously, and the effective workbench of motor is wide, and the course of work of three phase electric machine be singly go up, single winding work down, motor is easily saturated; The five-phase induction motor winding adopts parallel operation, in running, just in case have one to damage mutually, also can not influence operating state, has an enormous advantage so five-phase induction motor compares three phase electric machine mutually.

The utility model is not limited to above-mentioned execution mode; no matter on its shape or structure, do any variation; every to utilize the above-mentioned five phase DC brushless motor that is used for electric motor car all be a kind of distortion of the present utility model, all should think and drop within the utility model protection range.

Claims

1, a kind of five phase DC brushless motor that is used for electric motor car is characterized in that, comprises stator with five phase Y-connection windings and forms with respect to described winding rotor rotated, and described winding is in the position of rotation commutation of response rotor.

2, the five phase DC brushless motor that is used for electric motor car as claimed in claim 1, it is characterized in that, also comprise five position transducers and the controller that is connected respectively with described position transducer, position transducer is transformed into signal with the position of rotation of rotor and passes to controller, described controller is according to each the phase winding predetermined order conducting of the described stator of signal controlling that receives, and the stator phase current is pressed predetermined order commutation with the position of rotation variation of rotor.

3, the five phase DC brushless motor that is used for electric motor car as claimed in claim 2 is characterized in that, the conducting order of described each phase winding and described rotor rotation angle are synchronous.

4, the five phase DC brushless motor that is used for electric motor car as claimed in claim 3 is characterized in that, described rotor is made up of 42 magnet steel or 48 magnet steel.

5, the five phase DC brushless motor that is used for electric motor car as claimed in claim 4 is characterized in that, described stator circumferentially is provided with 45 grooves.