CN1472873A

CN1472873A - Brushless rareearth persistant magnet DC motor

Info

Publication number: CN1472873A
Application number: CNA021393192A
Authority: CN
Inventors: 季小尹; 符向荣
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2002-07-29
Filing date: 2002-07-29
Publication date: 2004-02-04
Anticipated expiration: 2022-07-29
Also published as: CN1286252C

Abstract

The current invention is a kind of rare earth brushless DC motor. To overcome the defect that exists that the motor rotor is more heavy and the assemble technology is poor in the current techniques, the current invention uses magnetic material to make the rotor yoke, put the rotor yoke to sheathe the ''I'' shape's support, use the tile-shaped rare earth permanent magnetic steel as magnetic pole and make it cling to the external surface of the rotor yoke that has fixing seam allowance, at the external of magnetic pole hoop a external tight ring, at the both sides of the rotor yoke each assemble the multi-functional ring rotor terminal plate, the current invention except has the normal advantage of the permanent magnetic motor, has reduces the weight and improves gravimetric specific power, and can be used as electric vehicle's driving motor.

Description

A kind of rare earth permanent magnet brushless direct current motor

(1) technical field

The present invention relates to a kind of rare earth permanent magnet brushless direct current motor.The stator and the rotor that particularly relate to a kind of rare earth permanent magnet brushless direct current motor.

(2) background technology

At present, the rare earth permanent magnet brushless direct current motor of aspect drive system of electric automobile, succeeding in developing in the world, compare with traditional AC induction motor have energy-efficient, volume is little, in light weight, output torque is big, overload capacity is strong, superior performance, the advantage that operates steadily.These advantages make electric automobile can bring into play longer continual mileage under same energy storage, make the electric automobile starting operation steadily, ride comfort.But there is defective in the rare earth permanent magnet brushless direct current motor of prior art on rotor structure, and the weight reduction of fully not exploiting potentialities causes that rotor weight is heavier, manufacturability is relatively poor, makes troubles for the assembling and the dynamic balance check of motor.

(3) summary of the invention

Defectives such as the rotor weight that exists in the existing rare earth permanent magnet brushless direct current motor technology is heavier in order to overcome, manufacturability difference, the present invention proposes a kind of rare earth permanent magnet brushless direct current motor.

Rare earth permanent magnet brushless direct current motor of the present invention is mainly by the motor stator that is embedded with armature winding with watt rotor of shape rare-earth permanent magnet steel is housed forms.

Motor stator core is to be overrided to form with some stator punchings, some stator punchings transition gradually along the circumferential direction when laminating, and shape stacks in the shape of a spiral, and slot-pitch angle of skew.

Rotor is to design at the motor magnetic circuit characteristics of excitation mode radially, do rotor yoke with permeability magnetic material, rotor yoke tightly is enclosed within on the rotor field spider, for preventing relatively rotating or axial endplay of rotor yoke and rotor field spider, sew in rotor yoke and cooperating of side, rotor field spider two ends, the symmetrical respectively junction of the edges of two sheets of paper is imbedded several screws.For alleviating the weight of rotor effectively, rotor field spider is two annulars, and its section is " worker " font, has several lightening holes on the brace rod in the middle of the rotor field spider.Rotor magnetic pole is some watt shape rare-earth permanent magnet steels that are close to the rotor yoke outer surface, at the external peripheral surface of magnetic pole the rotor outer straining ring that non-magnet material or low permeability magnetic material are made is housed.Side, two ends at rotor yoke is equipped with the rotor end plates that non-magnet material is made respectively, so that from the mechanical configuration aspects watt shape rare-earth permanent magnet steel that adequately protects.

In order to improve the assembly technology problem of motor in producing, the external peripheral surface two ends of the rotor yoke of motor of the present invention have the round seam step of protrusion respectively, can prevent from axially displaced when watt shape rare-earth permanent magnet steel assembles to have good thrust and positioning action.

Side, rotor yoke of the present invention two ends some screwed holes that on circumference, evenly distribute, and rotor end plates with the corresponding circumference of rotor yoke on also evenly distribute with the screw perforation of quantity.Utilize these screw holes, both can realize fixedlying connected of rotor end plates and rotor yoke, also can satisfy the dynamically balanced needs of rotor verification.

The external diameter of rotor end plates is less than or equal to the external diameter of rotor outer straining ring greater than the internal diameter of rotor outer straining ring, makes rotor end plates to play and prevents moving axially of rotor outer straining ring; The internal diameter of rotor end plates both can prevent less than the internal diameter of rotor yoke that rotor yoke from cooperating the screw loosening of sewing on to break away from rotor field spider, can stop moving axially of rotor yoke and rotor field spider again.

The present invention has remarkable result for rare earth permanent magnet brushless direct current motor weight reduction, raising gravimetric specific power, raising manufacturing assembly process process, raising structural safety reliability, improve the rare earth permanent magnet brushless direct current motor performance index, and can manufacture the motor of multi-polar structure easily.

(4) description of drawings

Fig. 1 is the structural profile schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 2 is the stator punching schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 3 is the stator core schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 4 is the rotor field spider schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 5 is the rotor yoke schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 6 is the rotor end plates schematic diagram of rare earth permanent magnet brushless direct current motor;

Fig. 7 is the rotor outer straining ring schematic diagram of rare earth permanent magnet brushless direct current motor.

(5) embodiment

Present embodiment is that a rated power is the hybrid power car rare earth permanent magnet brushless direct current motor of 15kW (peak power is 35kW).

This rare earth permanent magnet brushless direct current motor by a motor stator that is embedded with armature winding 1, one watt rotor of shape rare-earth permanent magnet steel 8 is housed, two end caps 3, housing 7 and two bearings 11 etc. are formed.

Motor stator is made of armature winding 1 and stator core 2.Stator core 2 is to be overrided to form with the stator punching 13 that the silicon steel material that 200 thickness are 0.5mm is made, and is uniform-distribution with 36 grooves on the stator punching 13, and the adjacent slot elongation is 10 degree; When laminating with stator punching 13 along the circumferential direction gradually transitional helix stack, the two-port that makes any one groove in the stator core 2 of its formation is at axial slot-pitch angle of skew 10 degree along the circumferential direction that are projected as.

No. 10 steel of rotor yoke 4 usefulness are made as permeability magnetic material, and the middle part external diameter is 126mm, and internal diameter 17 is 112mm, and axial width is 103mm.The screwed hole 16 of the side, two ends of rotor yoke 4 even respectively 24 M4 that distribute on straight circumference through being 119mm, and the round seam step 15 that a protrusion is arranged respectively at the external peripheral surface two ends of rotor yoke 4, the radially protrusion height of this circle seam step 15 is 2mm, axial width is 1.5mm, axially displaced in the time of can preventing watt shape rare-earth permanent magnet steel 8 assembling has good thrust and positioning action.

Rotor field spider 10 usefulness 45# steel are made, and the section shape of rotor field spider 10 is " worker " font, and axial width is 103mm.The axial view of rotor field spider 10 is two annulars, and the external diameter of its outer shroud is 112mm, and internal diameter is 100mm; In the external diameter of ring be 47mm, internal diameter is 35mm, thickness is arranged is the bearing rib of 10mm between two rings, the lightening hole 14 that to have 4 diameters on this bearing rib be 25mm.

Rotor end plates 5 usefulness duralumin are made as non-magnet material, and its external diameter 18 is 134mm, and internal diameter 20 is 100mm.Rotor end plates 5 with the rotor yoke 4 corresponding straight warps circumference that is 119mm on 24 perforation 19 that suitable M4 screw passes that also evenly distribute.

Rotor outer straining ring 6 usefulness stainless steels are made, and its external diameter 21 is 134mm, and internal diameter 22 is 132mm.This rotor outer straining ring 6 has advantages of higher tensile strength, so that a protection watt shape rare-earth permanent magnet steel 8 does not come off because of action of centrifugal force when motor runs up.

During assembling:

Rotor yoke 4 tightly is enclosed within on the rotor field spider 10; with 6 watt shape rare-earth permanent magnet steels 8 that are respectively N, S polarity by the extremely alternate rule of N utmost point S with the outer surface of high-temp epoxy glue at rotor yoke 4; external peripheral surface lock ring rotor outer straining ring 6 at watt shape rare-earth permanent magnet steel 8; side, two ends at rotor yoke 4 is loaded onto rotor end plates 5 respectively, so that from the mechanical configuration aspects watt shape rare-earth permanent magnet steel 8 that adequately protects.

The outer round surface of the internal circular surfaces of rotor yoke 4 and rotor field spider 10 closely cooperates, circle in this side, assembly two ends cooperates to be sewed on, the symmetrical respectively junction of the edges of two sheets of paper is imbedded two M4 opening holding screws 12, to prevent relatively rotating or axial endplay of rotor yoke 4 and rotor field spider 10.

Screw perforation 19 and screwed hole 16 are passed through with four M4 screws 9 respectively in side, two ends at rotor yoke 4, symmetrically rotor end plates 5 is fixed on the rotor yoke 4, this rotor end plates 5 both can prevent moving axially of rotor outer straining ring 6 and rotor field spider 10, also can prevent that rotor yoke 4 from cooperating 12 loosening disengagings of screw of sewing on rotor field spider 10.All the other screwed holes 16 are time plus-minus weight usefulness as rotor verification dynamic balancing, as required mounting screw.

After finishing above-mentioned making and assembling, the making of other parts and assembling are carried out routinely.

Present embodiment is fit to electronic or the two kinds of operating modes operations of generating electricity, energy-efficient, volume is little, in light weight, output torque is big, overload capacity is strong, superior performance, operate steadily reliably.

Claims

1. a rare earth permanent magnet brushless direct current motor comprises motor stator and rotor, it is characterized in that:

A. along the circumferential direction spiral stacks some stator punchings (13) of stator core (2) when laminating;

B. the magnetic pole of rotor is some watt shape rare-earth permanent magnet steels (8) that are close to rotor yoke (4) outer surface, at the external peripheral surface of magnetic pole the rotor outer straining ring made from non-magnet material or low permeability magnetic material (6) is housed;

C. rotor yoke (4) is made with permeability magnetic material, is sleeved on the rotor field spider (10), and the rotor end plates made from non-magnet material (5) is housed respectively in the side, two ends of rotor yoke (4);

D. the external peripheral surface two ends of rotor yoke (4) have the round seam step (15) of protrusion respectively, and rotor yoke (4) side, the two ends some screwed holes (16) that on circumference, evenly distribute, rotor end plates (5) with the corresponding circumference of rotor yoke (4) on also evenly distribute with the screw perforation (19) of quantity.

2. rare earth permanent magnet brushless direct current motor according to claim 1 is characterized in that rotor field spider (10) is two annulars, and its section is " worker " font, has several holes (14) on the middle brace rod.

3. rare earth permanent magnet brushless direct current motor according to claim 1, it is characterized in that the external diameter (18) of rotor end plates (5) greater than the internal diameter (22) of rotor outer straining ring (6), be less than or equal to the external diameter (21) of rotor outer straining ring (6); The internal diameter (20) of rotor end plates (5) is less than the internal diameter (17) of rotor yoke (4).

4. rare earth permanent magnet brushless direct current motor according to claim 1 is characterized in that rotor yoke (4) cooperates with the side, two ends of rotor field spider (10) to sew on that the symmetrical respectively junction of the edges of two sheets of paper is imbedded several screws (12).