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Permanent-magnet generator and windmill generator using the same

A generator, permanent magnet technology, applied in wind turbines, motors, wind power generation, etc., can solve the problem of reducing the efficiency of wind power generation, and achieve the effect of increasing the power generation voltage

Inactive Publication Date: 2010-02-03
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, wind power becomes less efficient as generators get larger

Method used

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  • Permanent-magnet generator and windmill generator using the same
  • Permanent-magnet generator and windmill generator using the same
  • Permanent-magnet generator and windmill generator using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] manufacture figure 1The generator shown in. Manufactured generators are designed with a variable number of stages for the rotor and stator, and the respective power generation voltages produced by changing the number of stages are measured. The shaft is made of stainless steel and has a diameter of 15mm. In the end rotor, eight NdFeB permanent magnets (poles oriented in the axial direction, thickness 4 mm) were concentrically adhered to a ferromagnetic yoke with a diameter of 100 mm and a thickness of 2 mm using an adhesive (epoxy resin), And arrange them in an alternating fashion so that the equidistant poles are oppositely oriented. In addition, in the inner rotor, a stainless steel member with a diameter of 100 mm and a thickness of 4 mm has eight equidistant holes formed for embedding magnets, and the same NdFeB permanent magnet (thickness: 4 mm) is embedded in each hole, and an adhesive (epoxy) fixed. Each rotor is connected to the shaft with a gap of 8 mm (th...

Embodiment 2

[0076] exist Figure 7 In , when the total weight of the magnets is the same, a comparison is made between (A) the three-stage case of two-stage rotor and one-stage stator and (B) the five-stage case of three-stage rotor and two-stage stator (the stator is not shown in the figure). The magnet structures of the rotor and the stator are the same as those of Embodiment 1. Each stator has the same specification. Each rotor has 8 magnetic poles, has a diameter of 100 mm, and has a rotor gap of 8 mm. Furthermore, in the case of the fifth stage, the thickness of the magnet is 4 mm, and in the case of the third stage, the thickness of the magnet is 6 mm. In stage five, the peak voltage is 18V at 450rpm. In level three, the peak voltage is 11V. Therefore, when using the same amount of magnets, the generated voltage can be greatly increased in the five-stage compared with the three-stage.

Embodiment 3

[0078] In another comparison, a three-stage generator having a two-stage rotor and one stator having an increased rotor diameter and an increased number of magnetic poles was compared with the five-stage generator of Embodiment 2. The magnet structures of the rotor and the stator are the same as those of Embodiment 1. The three-stage type generator has a rotor diameter of 130mm and has 10 magnetic poles, and the thickness of its magnets is set at 4.8mm so that the total weight of the magnets is the same as that of the five-stage type. In a three-stage generator, the peak voltage at 450 rpm is 17V. Therefore, although the three-stage type has a 30% larger diameter and a 69% larger surface area than the five-stage type of Example 2, the peak voltage is similar or even lower.

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Abstract

A windmill electric-generating unit improved in generated potential because of no interference with the captured wind, unlike large-capacity generator vulnerable to the interference with the capturedwind in the windmill. The permanent-magnet generator has a revolving shaft, at least three stage rotors of multiple disc constructions connected to the shaft in tandem an a lengthwise direction of theshaft and having mounted permanent magnets thereon, and stators of disc construction with stator windings of copper wires, which are isolated from the revolving shaft and laid in at least two gaps each of which is between any two adjacent rotors. The rotors and stators are arranged to alternate each other in the lengthwise direction of the shaft across five stages or more. Further, there is provided the windmill generator in which a propeller is coupled to the rotor shaft of the permanent-magnet generator constructed as stated earlier.

Description

technical field [0001] The invention relates to a generator, in particular to a generator used as a low-speed generator for wind power, water power and the like. Background technique [0002] During wind power generation, the rotational energy of the blades is transferred to the rotating shaft of the generator so that the rotational energy is converted into electrical energy. The output of the generator is either connected to system power or stored in a battery and used as electricity when necessary. Since the electricity generated depends on the specifications of the generator, the generator needs to be selected to meet the needs of the power generation equipment. [0003] There are several types of generators, including, for example, the type that uses coils, the type that uses permanent magnets as field magnets, or, depending on its structure, the radial type in which the stator surrounds the outside of a cylindrical rotor, and the stator faces the disc in the axial dire...

Claims

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Application Information

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IPC IPC(8): H02K21/24F03D9/00H02K7/18H02K16/00
CPCH02K7/1838Y02E10/725H02K21/24H02K7/183
Inventor 美浓轮武久小林秀树宫田浩二
Owner SHIN ETSU CHEM IND CO LTD
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