CN201278473Y - Permanent magnet wind power generator for combined stator structure - Google Patents

Abstract

The utility model provides a permanent-magnet wind power generator combined with a stator structure, belonging to the field of permanent-magnet wind power generators. I-shaped punched sheets are overlapped and pressed to form magnetic poles; two sides of the yoke of each punched sheet are respectively provided with a punched sheet lug and a punched sheet groove; when the punched sheets are overlapped and pressed to form magnetic poles, the punched sheet lugs and the punched sheet grooves are respectively overlapped and pressed to form magnetic pole lugs and magnetic pole grooves; coils are winded round the magnetic poles to form stator windings; every two adjacent magnetic poles are formed through splicing magnetic pole lugs and magnetic pole grooves and welded together; the magnetic poles are circumferentially spliced into stators in hollow cylinder shapes; polar grooves of stators and polar grooves of rotors have a ratio of 24:22 or 24n:22n; the rotors are embedded in the center of the stators; shafts are inserted in the wheel hubs of the rotors, and the shafts are connected with bearing inner rings; bearing outer rings are connected with end covers; and bearings drive the shafts to rotate, so that the shafts drive the rotors to rotate.

Description

A permanent magnet wind generator with combined stator structure

technical field

The utility model relates to the technical field of generators, in particular to a permanent magnet wind generator with a combined stator structure.

Background technique

The national standard GB/T10760.1-2003 has regulations on the limit value of the starting resistance torque value of the off-grid permanent magnet wind turbine under no-load conditions. From the actual application situation, the starting resistance torque of the permanent magnet wind turbine is smaller. The better it is, the smaller the starting resistance torque can make the permanent magnet wind generator start and generate electricity under the breeze, which improves the utilization rate of wind energy. The starting resistance torque of the permanent magnet wind turbine mainly includes: friction, hysteresis torque and cogging torque; in order to reduce the starting resistance torque, we mainly start from these three aspects, in which the cogging torque occupies the vast majority, there are According to the literature, the most effective way to reduce the cogging torque is the stator closed slot, which can basically eliminate the cogging torque. However, the choice of closed slots for permanent magnet motors brings great difficulties to the embedding of the motor windings, and it is difficult to adopt in actual motor production. The stator of the current permanent magnet wind turbine is not much different from that of ordinary motors, so it is urgent to propose a New structure to reduce starting resistance torque.

Generally, the pole-slot ratio of the motor is far less than 1. Due to the large number of poles of the direct-drive permanent magnet generator, if the integer-slot winding stator span is large, the problem is that the end is longer, wasting materials and causing losses. As well as problems such as heating at the end, the above reasons lead to poor results when applied to low-speed direct-drive permanent magnet wind turbines, so a new pole-slot fit is proposed.

Utility model content

In order to solve the problems in the above devices, the utility model provides a permanent magnet wind generator with combined stator structure to reduce the starting resistance torque and improve the efficiency.

The structural design of the utility model is achieved in this way: the permanent magnet wind power generator includes a stator, a rotor, a bearing, an end cover and a shaft, and is characterized in that the stator is in the shape of a hollow cylinder, and the hollow cylinder is formed by splicing magnetic poles. The magnetic poles are formed by stacking punched sheets, and the stator windings are wound on the stacked magnetic poles. The pole-slot ratio of the stator and the rotor is 24:22. The 24-slot stator winding of the permanent magnet wind turbine corresponds to the 24-slot stator. The rotor has a 22-pole structure. When the stator adopts 48 slots, the corresponding rotor adopts a 44-pole structure, and the corresponding multiples.

The punching sheet is in the shape of "I", with arc-shaped upper and lower edges, and at least one punching sheet protrusion and at least one punching sheet groove are respectively arranged on both sides of the punching sheet yoke. When the power of the motor is increased to 20KW, the outer diameter of the stator must also be increased, but under the condition of satisfying the strength and processing accuracy, two or more punching protrusions and punching grooves can be used, and the magnetic poles are stacked by punching sheets. At the same time of pressing, the punching protrusions and the punching grooves are respectively laminated into magnetic pole protrusions and magnetic pole grooves.

The hollow cylinder is formed by splicing magnetic poles. Two adjacent magnetic poles are connected by magnetic pole protrusions and magnetic pole grooves and welded to death along the axial direction. There is a gap between adjacent two magnetic pole shoes, which can obviously weaken the teeth slot torque.

The beneficial effects of the utility model are: the combination structure of the stator is adopted, the wire embedding of the motor winding is convenient, the process is simple, the utilization rate of the punching sheet is high, the air gap between the pole shoes is extremely small, the cogging torque is obviously weakened, and the starting torque is reduced. Resistance torque, this pole slot matching method can ensure the maximum reduction of the length of the winding end, save materials, reduce the copper consumption of the motor and heat generation at the end, and improve efficiency.

Description of drawings

Fig. 1 is the structural representation of the stator punching plate of the utility model;

Fig. 2 is the effect diagram after the magnetic pole combination of the utility model;

Figure 3 is a schematic diagram of the stator and rotor assembly of the utility model;

In the figure: 1-Punching protrusion, 2-Punching groove, 3-Pole shoe, 4-Stator, 5-Rotor, 6-Hub

Detailed ways

The detailed structure of the utility model is illustrated in conjunction with the following embodiments and accompanying drawings.

As shown in the figure, the permanent magnet wind generator includes a stator 4, a rotor 5, a bearing, an end cover, and a shaft, wherein the stator 4 is in the shape of a hollow cylinder, and the hollow cylinder is formed by splicing magnetic poles, and the magnetic poles are formed by stacking punched sheets , the stator winding is wound on the laminated magnetic poles, the punching piece is in the shape of "I", the upper and lower edges are arc-shaped, and a punching protrusion 1 and a punching groove are respectively set on both sides of the punching yoke 2. While the punching sheets are stacked to form a magnetic pole, the punching protrusion 1 and the punching groove 2 are respectively stacked into a magnetic pole protrusion and a magnetic pole groove, and two adjacent magnetic poles are combined through the magnetic pole protrusion and the magnetic pole groove. And welded in the axial direction, there is a gap between two adjacent pole pieces, which can significantly weaken the cogging torque, the rotor 5 is embedded in the hollow part of the stator 4, the hub 6 of the rotor 5 is inserted into the shaft, and the shaft and the bearing The outer ring of the bearing is connected with the end cover, and the bearing drives the shaft to rotate, thereby driving the movement of the rotor 5. The pole-slot ratio of the stator 4 and the rotor 5 is 24:22. The 24-slot stator winding of the permanent magnet wind turbine, the stator 24 slots correspond to the 22-pole structure of the rotor. This pole-slot matching method can ensure that the length of the winding end is minimized, saving materials, and at the same time reducing the copper loss and end heat of the motor, and improving efficiency.

Claims (4)

1, a kind of permanent-magnetic wind driven generator of combined stator structure, comprise stator (4), rotor (5), bearing, end cap and axle, it is characterized in that described stator is the hollow cylinder shape, hollow cylinder is spliced by magnetic pole, be wound with coil on the magnetic pole, magnetic pole is laminated by punching and forms, and the utmost point groove ratio that stator (4) and rotor (5) adopt is 24: 22 or 24n: 22n, and n is a natural number.

2, according to the permanent-magnetic wind driven generator of the described a kind of combined stator structure of claim 1, it is characterized in that described punching is " worker " font, last lower limb is curved, and is respectively equipped with at least one punching projection (1) and at least one punching groove (2) in punching yoke portion both sides.

3,, it is characterized in that described magnetic pole is laminated by punching to form that punching projection (1) and punching groove (2) laminate into the protruding and magnetic pole groove of magnetic pole respectively simultaneously according to the permanent-magnetic wind driven generator of the described a kind of combined stator structure of claim 1.

4, according to the permanent-magnetic wind driven generator of the described a kind of combined stator structure of claim 1, it is characterized in that described hollow cylinder is spliced by magnetic pole, two adjacent magnetic poles are connected with the magnetic pole groove by the magnetic pole projection, form the space between adjacent two magnetic pole pole shoes (3).

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