CN201378785Y

CN201378785Y - Wind generator with high torque density

Info

Publication number: CN201378785Y
Application number: CN200920035729U
Authority: CN
Inventors: 林鹤云; 颜建虎; 冯奕
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2009-03-18
Filing date: 2009-03-18
Publication date: 2010-01-06
Anticipated expiration: 2019-03-18

Abstract

The utility model provides a wind generator with high torque density, in particular to a direct drive type novel horizontal magnetic flux wind generator with high power density and high torque density. A stator consists of a plurality of stator iron cores (1) distributed at the periphery of a rotor and an armature winding (4), each stator iron core (1) is U-shaped, a first permanent magnet (2) and a second permanent magnet (3) are embedded into two sides of the stator iron core respectively, the magnetic poles of the two permanent magnets are opposite to each other, the ring-shaped winding (4) is arranged in the stator, the magnetic poles of the first permanent magnet (2) and the second permanent magnet (3) of two adjacent stator iron cores (1) in each phase are opposite to each other, all rotor iron cores (5) have the same dimension, two adjacent rotor iron cores (5) in each phase are bilaterally aligned with each other at an interval, and the rotor iron cores (5) are made by piling up silicon sheets and installed on a non-magnetic conducting material cylinder (8) as a whole which is connected with a rotating shaft (6) of the generator, and finally connected with a housing (7) through a bearing (9).

Description

The wind-driven generator of high torque density

Technical field

The utility model relates to a kind of improved generator, the magnetic flux switching type transverse magnetic flux permanent magnetism wind mill generator in particularly a kind of high-performance and direct driving field.

Background technology

The aggravation of energy crisis, the lifting of restriction global economy, and threatening human social, develop the important component part that new and renewable sources of energy has become global majority state energy development strategy energetically.Than the regenerative resource of other form, wind energy (Wind Power) maturity is the highest, and economy is best.By 2010, global wind-powered electricity generation installation total capacity will reach 230GW, the about 10GW of China, and growth momentum is swift and violent, and exploitation prospect is wide.Wind-driven generator (Wind Generator) is the key core equipment of wind power system, and its electric and quality mechanical performance directly affects the efficient of wind-powered electricity generation power conversion and the cost and the reliability of system.

Because the wind-driven generator rotating speed is lower, middle low power be tens～hundreds of rev/min, the MW level have only tens rev/mins, according to Principle of Electric Engine, reach certain power, and will reduce motor diameter, alleviate its volume and weight, just must enlarge markedly electromagnetic force.Electromagnetic force is proportional to magnetic flux and electric current, in the traditional radial flux and axial-flux electric machine, the iron core of guiding magnetic flux and the lead of conduction current are in the same plane, under the certain situation of motor diameter, increase core area and increase cross-sectional area of conductor long-pending conflicting.Fortunately, transverse flux motor (Transverse Flux Motor-TFM) can address this problem, its armature winding and main magnetic circuit are structurally full decoupled, therefore can independently adjust coil window and magnetic circuit size as required and determine electricity, the magnetic loading of motor, thereby can obtain very high torque density.

Though lot of domestic and foreign mechanism had carried out number of research projects to the transverse magnetic flux generator in recent years, also exist some problems to demand urgently improving and solving.Existing transverse flux permanent magnetic motor, the only corresponding one group of stator core of two adjacent groups rotor core, the space availability ratio of magnetic flux is on the low side, and the effective length ratio of winding is not high, and torque density also has the space of improving.

Summary of the invention

Technical problem: technical problem to be solved in the utility model is: the magnetic flux switching type transverse magnetic flux permanent magnetism wind mill generator that a kind of high power density and high torque density are provided.

Technical scheme: magnetic flux switching type transverse magnetic flux permanent magnetism wind mill generator of the present utility model, stator is to be made of the some stator cores and the armature winding that are distributed in peritrochanteric, each stator core is the U type, both sides embed first permanent magnet, second permanent magnet respectively, this two permanent magnet magnetics extreme direction is relative, place Circular Winding in the stator, first permanent magnet, second permanent magnet pole of every mutually adjacent two stator cores are opposite; Each rotor core measure-alike, the left and right alignment respectively of every mutually adjacent two rotor cores is spaced, and silicon steel plate packing is adopted in rotor core, and is installed in rotor integral body of formation on the non-magnet material cylinder, and link to each other with machine shaft, link to each other with casing by bearing at last.

Each stator core measure-alike, and adopt silicon steel plate packing, and be installed in the casing sleeve of non-magnet material and form a stator integral body.Described three groups of stator cores and three group rotors are unshakable in one's determination and come the motor shaft direction, and make every group of stator core differ 120 degree electrical degrees, perhaps make every group rotor iron core differ 120 degree electrical degrees, constitute threephase generator.

When stator core and rotor core are the motor of number of poles 2p, every rotor core that has 2p stator core and 2p mutually.First permanent magnet, second permanent magnet are selected NdFeB material for use.Stator core and rotor core position can exchange, and constitute the version of external rotor, internal stator.

Beneficial effect: place a pair of permanent magnet in the stator core, and the permanent magnet magnetization direction in adjacent two stator cores is opposite, in conjunction with the left and right spaced design feature of aliging respectively of adjacent two rotor cores, can realize the function that magnetic flux switches, can avoid the situation of the only corresponding stator core of adjacent two rotor cores, when the number of poles 2p of this motor, every rotor core that has 2p stator core and 2p mutually, i.e. rotor core is corresponding to a stator core, thereby improved the utilance of motor magnetic flux.In addition, also shorten the invalid length of winding effectively, improved the torque density of motor to a certain extent.

Each stator core of this motor is measure-alike, and each rotor core size is also identical, and all available silicon steel plate packing forms.Each stator core is installed in the non-magnet material casing circular sleeve, forms stator integral body; Each rotor core is placed on the non-magnet material cylinder, forms rotor integral body, and links to each other with machine shaft.Owing to adopted silicon steel plate packing, can reduce the leakage flux of motor effectively, thereby can improve the power factor of motor.

Description of drawings

Fig. 1 is the wind-driven generator structure schematic diagram (a mutually a pair of utmost point) of high torque density;

Fig. 2 is the profile (phase) of the wind-driven generator of high torque density;

Fig. 3 is t ₀The main flux of the wind-driven generator of high torque density;

Fig. 4 is the main flux of the wind-driven generator of high torque density.

Generator stator core 1, the first permanent magnet 2, second permanent magnet 3 are arranged, armature winding 4, rotor core 5, alternator shaft 6, casing 7, non-magnet material rotor cylinder 8, bearing 9 among the above figure.

Embodiment

The wind-driven generator of high torque density of the present utility model is made up of stator, rotor.Space availability ratio for the better utilization transverse magnetic flux, two ends in stator core, embed a pole orientation permanent magnet opposed respectively, permanent magnet magnetization direction in every mutually adjacent two stator cores is opposite, silicon steel plate packing is all used in each stator core, and measure-alike, and place in the non-magnet material casing sleeve, stator integral body formed.Permanent magnet in the stator core adopts NdFeB material.

Each rotor core only has silicon steel plate packing, and is simple in structure, and each rotor core is measure-alike, and the left and right alignment respectively of every mutually adjacent two rotor cores is spaced, and places on the non-magnet material cylinder, constitutes rotor integral body.

When generator is the m phase time, the electrical degree between every phase structure differs the 360/m degree.Especially, during as threephase generator, the electrical degree between every phase structure differs 120 degree.In addition, when the number of poles 2p of this motor, every rotor core that has 2p stator core and 2p mutually.Therefore can effectively utilize its space.

Motor magnetic flux switching principle is as follows:

There are two different intervening portions in this rotor.

When rotor is in the position for the moment, the flow direction that passes stator winding that adjacent two unit permanent magnetism produce is all a direction; And when rotor be in position one differ 180 the degree electrical degrees position two time, flow direction switches to another direction.When rotor rotated continuously, the flow direction of linkage was periodically-varied in the stator winding, thereby induced induced potential, realized energy converting between mechanical.

As shown in Figure 1, for single-phase generator, the physical model of this magnetic flux switching type transverse magnetic flux permanent magnetism wind mill generator mainly is made up of following components; Stator core 1, first permanent magnet 2, second permanent magnet 3, armature winding 4, rotor core 5, alternator shaft 6, non-magnet material stator sleeve 7 and non-magnet material rotor cylinder 8 are formed.Each stator is made of stator core 1 and armature winding 4 and first permanent magnet 2, second permanent magnet 3; Rotor portion comprises that the adjacent and left and right spaced rotor core 5 of aliging respectively constitutes.Each stator core 1 consistent size, and adopt silicon steel plate packing, and be installed in stator integral body of formation in the non-magnet material sleeve 7.Each rotor core 5 consistent size, and adopt silicon steel plate packing, and be installed in rotor integral body of formation on the non-magnet material cylinder 8, and link to each other with alternator shaft 6, and link to each other with motor case by bearing 9.Robustness and reliability during with amplification generator rotor rotary work guarantee the even running of generator in operation process.

For the m phase generator, on the direction of motor shaft 6, the same stator and rotor sructure of total accordingly m group, and make the electrical degree of every group of structure differ 360/m degree (m is the number of phases).

The motor of outer-rotor structure also is applicable to this.

In addition, consider, select to have the material of the Nd-Fe-Bo permanent magnet material of higher coercivity as motor first permanent magnet 2, second permanent magnet 3 from improving motor gas-gap magnetic thermal stability close and magnet steel.

Claims

1, a kind of wind-driven generator of high torque density, it is characterized in that: stator is to be made of some stator cores (1) that are distributed in peritrochanteric and armature winding (4), each stator core (1) is the U type, both sides embed first permanent magnet (2), second permanent magnet (3) respectively, this two permanent magnet magnetics extreme direction is relative, place Circular Winding (4) in the stator, first permanent magnet (2), second permanent magnet (3) magnetic pole of every mutually adjacent two stator cores (1) are opposite; Each rotor core (5) measure-alike, the left and right alignment respectively of every mutually adjacent two rotor cores (5) is spaced, silicon steel plate packing is adopted in rotor core (5), and be installed in non-magnet material cylinder (8) and go up form a rotor integral body, and link to each other with machine shaft (6), link to each other with casing (7) by bearing (9) at last.

2, according to the wind-driven generator of right 1 described high torque density, it is characterized in that: each stator core (1) measure-alike, and adopt silicon steel plate packing, and be installed in casing (7) sleeve of non-magnet material and form a stator integral body.

3, according to the wind-driven generator of right 1 described high torque density, it is characterized in that: described three groups of stator cores (1) and three group rotor iron cores (5) also come motor shaft (6) direction, and make every group of stator core (1) differ 120 degree electrical degrees, perhaps make every group rotor iron core (5) differ 120 degree electrical degrees, constitute threephase generator.

4, according to the wind-driven generator of right 1 described high torque density, it is characterized in that: when stator core (1) and rotor core (5) are the motor of number of poles 2p, every rotor core (5) that has 2p stator core (1) and 2p mutually.

5, according to the wind-driven generator of right 1 described high torque density, it is characterized in that: first permanent magnet (2), second permanent magnet (3) are selected NdFeB material for use.

6, according to the wind-driven generator of right 1 described high torque density, it is characterized in that: stator core (1) and rotor core (5) position can exchange, and constitute the version of external rotor, internal stator.