CN-115955027-B - Magnetic pole structure for eliminating lateral component force of magnetic pole coil

Abstract

The invention relates to the technical field of salient pole hydroelectric power generation equipment, in particular to a magnetic pole structure for eliminating lateral component force of a magnetic pole coil, which comprises the magnetic pole coil, a magnetic pole shoe and a magnetic pole body; when the machine set is static, the central line of the magnetic pole coil is perpendicular to the pole shoe and parallel to the pole body, the intersection point of the central line of the magnetic pole coil and the central line of the magnetic pole is positioned at the outer diameter side of the center of the rotor, when the machine set reaches the rated rotation speed, the central line of the magnetic pole coil is perpendicular to the pole shoe and forms an included angle delta with the pole body, and the intersection point of the central line of the magnetic pole coil and the central line of the magnetic pole is just positioned at the center of the rotor. The magnetic pole structure can solve the problem of lateral component force of the magnetic pole coil.

Inventors

• ZHU ZHONGYING
• LIU JIANJUN
• WANG YONG
• LIU XIAO

Assignees

• 东方电气集团东方电机有限公司

Dates

Publication Date

20260512

Application Date

20230104

Claims (6)

1. 1. A magnetic pole structure for eliminating lateral component force of a magnetic pole coil comprises the magnetic pole coil (6), a magnetic pole shoe (4) and a magnetic pole body (5), and is characterized in that when a unit is static, the central line of the magnetic pole coil (6) is perpendicular to the magnetic pole shoe (4) and is parallel to the magnetic pole body (5), the intersection point of the central line extension line of the magnetic pole coil (6) and the central line of the magnetic pole is positioned on the outer diameter side of a rotor center (3), when the unit reaches a rated rotation speed, the central line of the magnetic pole coil (6) is perpendicular to the magnetic pole shoe (4) and forms an included angle delta with the magnetic pole body (5), the intersection point of the central line extension line of the magnetic pole coil (6) and the central line of the magnetic pole is exactly positioned in the rotor center (3), and the magnetic pole shoe (4) rotates around a joint point (9) of the magnetic pole shoe and the magnetic pole body under the centrifugal force of the unit and the magnetic pole coil (6), and when the unit reaches the rated rotation speed, the rotation angle a of the magnetic pole shoe (4) is identical to the included angle delta.
2. 2. The pole structure for eliminating lateral component force of pole coil according to claim 1, wherein the calculating method of the included angle delta is as follows: δ=GL 2 /2EI Wherein G is the sum of the side weight of the magnetic pole coil (6) and the cantilever weight of the magnetic pole shoe (4), L is the vertical distance from the gravity center of the magnetic pole coil (6) to the magnetic pole body (5), E is the elastic modulus of the magnetic pole shoe (4) material, and I is the moment of inertia of the cross section of the cantilever section of the pole shoe.
3. 3. The pole structure for eliminating lateral component force of pole coil according to claim 2, wherein the pole structure further comprises correction of elastic modulus E of the pole shoe (4) material when calculating the included angle delta, and the value range of the corrected elastic modulus E is 1.8-2.0e5MPa.
4. 4. A pole structure for eliminating lateral force components of a pole coil according to claim 1, wherein the top surface of the pole coil (6) is separated from the pole shoe (4) by an insulating support plate (7).
5. 5. A pole structure for eliminating a lateral component of a pole coil according to claim 1, wherein an electrical distance is maintained between the side of the pole coil (6) and the pole body (5).
6. 6. The magnetic pole structure for eliminating lateral component force of magnetic pole coil according to claim 5, wherein an insulating plate (8) is arranged between the side edge of the magnetic pole coil (6) and the magnetic pole body (5), and felt is coated on the insulating plate (8).

Description

Magnetic pole structure for eliminating lateral component force of magnetic pole coil Technical Field The invention relates to the technical field of salient pole hydroelectric power generation equipment, in particular to a magnetic pole structure for eliminating lateral component force of a magnetic pole coil. Background The magnetic poles are an important component of the rotating parts of the motor and are used for generating a magnetic field to perform electromechanical energy conversion. When the motor is running, the magnetic poles rotate along with the rotor, and the magnetic poles are subjected to larger centrifugal force, so that the magnetic poles need to be reliably fixed on the magnet yoke. As for the magnetic pole itself, it is composed of a magnetic pole core, a magnetic pole coil, a fixing member of the magnetic pole coil, and the like. The magnetic pole iron core is formed by stacking thinner magnetic pole punching sheets and combining a whole body by a magnetic pole tensioning screw rod, the outer diameter side of the magnetic pole iron core is a magnetic pole shoe, the inner diameter side of the magnetic pole iron core is a magnetic pole body and is provided with a T tail, and the T tail of the magnetic pole is matched with a T tail groove of a magnetic yoke and is fixed together. The magnetic pole coil is sleeved on the magnetic pole iron core, the outer side of the magnetic pole coil is attached to the magnetic pole shoe part, and the centrifugal force generated by the rotation of the magnetic pole coil along with the rotor is borne by the magnetic pole shoe part. The magnetic pole coil is sleeved on the magnetic pole iron core, and under the condition that certain included angles exist between the two side edges of the magnetic pole iron core and the center of the magnetic pole, the magnetic pole coil is subjected to certain lateral component force, which is also the root of lateral deformation of the magnetic pole coil. If the machine set is designed by adopting a tower-type magnetic pole structure, namely, the magnetic pole coil is designed so that the side edges of the magnetic pole coil are arranged in a centripetal way, the lateral component force of the magnetic pole is theoretically zero. However, in the actual production process, it was found that there was still a large lateral deformation of the pole coil. Through related theoretical analysis and experimental research, the magnetic pole shoes are found to incline under the action of the magnetic pole coils, so that the magnetic pole coils are not arranged centripetally any more, namely lateral component force is generated, and the magnetic pole coils are laterally deformed. At present, for high-rotation-speed units, particularly for pumped storage units, how to prevent the magnetic pole coils from being excessively deformed and solve the potential safety hazard brought by the magnetic pole coils is a problem to be solved first. The proposal adopted at present is to add an interelectrode support block between adjacent magnetic pole coils or add a shroud ring outside the magnetic pole coils. For example, in the prior art, a Chinese patent document with publication number of CN213072245U and publication date of 2021, 04 and 27 is proposed, and the technical scheme disclosed in the patent document is that a fixing structure of a pole of a salient pole generator of a hydro-generator is formed by connecting a pole iron core with a support and a hub and a rotating shaft into a whole through a yoke, a pole coil is sleeved on the side edge of the pole iron core, the side edge and the bottom edge of the pole coil are fixed through a shroud, the shroud is connected with the pole iron core through a plug-in structure and a bolt, a lateral insulating pad and a bottom edge insulating pad are further arranged between the pole coil and the shroud, an elastic buffer piece is arranged between an insulating pad at the bottom of the pole coil and the inner wall of the shroud, the elastic buffer piece comprises a disc spring with a disc spring cap and an adjusting pad, and the elastic direction of the disc spring corresponds to the expansion direction of thermal expansion of the pole coil under the action of exciting current. The purpose of the technical proposal is to reduce the deformation of the magnetic pole coil. The added pole-to-pole support blocks or pole coil shrouds themselves will withstand the forces from the deformation of the pole coils, often creating their own safety concerns. Meanwhile, the structure and the production process of the magnetic pole are complex, the heat dissipation of the magnetic pole is influenced, and the post maintenance of the magnetic pole is also very inconvenient. Disclosure of Invention In order to solve the technical problems, the invention provides a magnetic pole structure for eliminating the lateral component force of a magnetic pole coil, which can solve the problem of the lateral component force of t