CN111446793A - Dynamic balance magnet yoke counterweight method for hydroelectric generating set - Google Patents
Dynamic balance magnet yoke counterweight method for hydroelectric generating set Download PDFInfo
- Publication number
- CN111446793A CN111446793A CN202010371152.8A CN202010371152A CN111446793A CN 111446793 A CN111446793 A CN 111446793A CN 202010371152 A CN202010371152 A CN 202010371152A CN 111446793 A CN111446793 A CN 111446793A
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- balancing weight
- bolt
- clamp plate
- weight
- yoke
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a method for balancing weight of a dynamic balance magnet yoke of a water turbine generator set, wherein during a dynamic balance test of the water turbine generator set, the effect of the weight balance test is directly influenced by the determination of the weight balance method, a mode of opening a hole on a magnet yoke pressing plate and adding a balancing weight to balance weight can be adopted for a floating magnet yoke and a high-speed water turbine generator set, and the method for balancing weight can effectively solve the problem that when the balance weight is carried out on a rotor bracket, the transfer of the balancing weight force can act on an unbalanced part only through a magnet yoke tangential key. The invention can be applied to the dynamic balance process of a high-speed hydraulic generator set and a pumped storage set adopting a floating magnetic yoke structure, and can eliminate various unbalanced forces by using smaller counterweight mass so as to achieve the balanced and stable running state of the set.
Description
Technical Field
The invention relates to the field of water turbines, in particular to a method for balancing weights of a dynamic balance magnet yoke of a water turbine generator set.
Background
The hydroelectric generating set is influenced by various factors such as machinery, electromagnetism and water power, various unbalanced forces exist in the actual operation process, and in order to eliminate the influence of the unbalanced forces on the operation stability of the hydroelectric generating set, the rotor of the hydroelectric generating set needs to be weighted so that the runout index of the hydroelectric generating set meets the national standard requirement.
The adoption of the hot-sleeve type magnetic yoke structure is to balance the weight on the rotor support, the method for balancing the weight has a better effect on the magnetic yoke and the rotor support of the water turbine rotor with an interference fit structure, but for the floating magnetic yoke structure, because the rotor support and the magnetic yoke are in clearance fit, the centrifugal force generated by the magnetic pole and the magnetic yoke is transferred through the magnetic yoke tangential key, the structure can lead the balance state of the start rotating part of the water turbine generator set to change every time when the weight is carried out on the rotor support, and therefore the instability of the set is caused. Apply counter weight on the yoke, when opening the machine at every turn, yoke and spider carry out dynamic separation, need not carry out the transmission of power with yoke tangential key, can guarantee that the unit keeps radial atress balanced at the in-process that opens the machine, because the radial increase of counter weight to high rotational speed rotor, the balancing weight that can the quality is less reaches the actual effect of carrying out big quality counter weight on spider.
Disclosure of Invention
The invention aims to provide a method for balancing weights of a dynamic balance magnet yoke of a water turbine generator set, so as to solve the problem of dynamic balance of the water turbine generator set. The technical scheme of the invention is as follows:
1) the balance weight is carried out at the balance weight position reserved on the upper part of a rotor magnetic yoke pressing plate (1) of the water turbine generator set, a 30-degree circumferential direction is taken as a dividing angle, mounting threaded holes (2) are arranged on the upper part of a magnetic yoke at intervals of 30 degrees along a radial direction, wherein 3 mounting threaded holes (2) are arranged when the radial distance is more than or equal to 1m, 2 mounting threaded holes (2) are arranged when the radial distance is less than 1m, a balance weight block (3) is positioned and installed by a positioning spigot (4) on the magnetic yoke pressing plate, and is fixedly installed on the upper part of the magnetic yoke pressing plate (1) through a bolt,the balancing weight (3) is tightened by a bolt (5) according to the formula F ═ m omega2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular speed of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the combined bolts, locking glue is coated at the thread position of the bolt after the bolt is pre-tightened, and the balancing weight is welded in an angle welding seam mode;
2) install the setting of the radial screw hole of balancing weight in hydraulic turbine rotor yoke clamp plate (1) lower part, every 30 along radially setting up installation screw hole (2) on yoke clamp plate (1), wherein divide equally when radial distance is greater than or equal to 1m and set up 3 installation screw hole (2), set up 2 installation screw hole (2) when < 1m, it is corresponding with upper portion, with balancing weight (3) to closing fixed mounting in hydraulic turbine rotor yoke clamp plate (1) lower part, balancing weight (3) are with location tang (4) location installation on the yoke clamp plate, close fixed mounting in yoke clamp plate (1) lower part through the bolt, with bolt (5) with balancing weight (3) tight, with formula F ═ m omega2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular speed of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the combined bolts, locking glue is coated at the thread position of the bolt after the bolt is pre-tightened, welding is carried out in the form of an angle welding seam, and the installation of the balancing weight is completed.
Technical effects
The counterweight position and the counterweight method of the hot-sleeve type magnetic yoke structure are obviously different relative to a floating magnetic yoke structure, the counterweight position and the counterweight method of the hot-sleeve type magnetic yoke structure are adopted for carrying out counterweight in the axial direction of a rotor support, the counterweight method of the hot-sleeve type magnetic yoke structure is adopted for carrying out counterweight on the radial upper part and the radial lower part of a rotor magnetic yoke, the counterweight method of the hot-sleeve type magnetic yoke can be applied to a rotor with the magnetic yoke and the rotor support in an interference fit structure, but for the floating magnetic yoke structure, because the rotor support and the magnetic yoke are in clearance fit, centrifugal force generated by a magnetic pole and the magnetic yoke is transmitted through a magnetic yoke tangential key, the counterweight method of the hot-sleeve type magnetic yoke structure on the rotor support can cause the change of the balance state of the rotating part of the water-turbine generator set at each time of starting, thereby causing the unstable phenomenon of the operation of the generator, therefore, the method has the defects of more auxiliary materials, long installation preheating time, high temperature, low safety and long assembly period in the processing and installation processes. The floating magnetic yoke structure does not need to be sleeved by a heat sleeve, and the weight of the balance weight is applied to the magnetic yoke, when the generator is started each time, the magnetic yoke is dynamically separated from the rotor support, the transmission of force by a magnetic yoke tangential key is not needed, the balance of radial stress of the generator set in the starting process can be ensured, the actual effect of large-mass balance weight on the rotor support can be achieved by the balance weight with smaller mass due to the increase of the radius of the balance weight of the high-speed rotor, and the balance weight method can also be applied to the heat sleeve type magnetic yoke structure.
Drawings
FIG. 1 is a front plan view of a yoke counterweight installation
FIG. 2 is a side cross-sectional view of a yoke weight mount
Detailed Description
The invention aims to provide a method for balancing weights of dynamic balance magnet yokes of a water-turbine generator set, which is shown in figures 1 and 2:
1) carry out the counter weight in the counter weight position that hydroelectric set's rotor yoke clamp plate 1's upper portion was reserved, on hydraulic turbine rotor yoke clamp plate 1, circumference uses 30 as cutting apart the angle, every 30 along radially setting up installation screw hole 2 on yoke upper portion, wherein radial distance is greater than or equal to 3 installation screw hole 2 when 1m, set up 2 installation screw hole 2 when < 1m, balancing weight 3 is with location tang 4 location installation on the yoke clamp plate, close fixed mounting on yoke clamp plate 1 upper portion through the bolt, with bolt 5 with balancing weight 3 tight, with formula F ═ m omega2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular velocity of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the fastening bolts, and the boltsCoating locking glue at the screw thread of the bolt after pre-tightening, and welding the balancing weight in a fillet weld manner;
2) install the setting of the radial screw hole of balancing weight in 1 lower part of hydraulic turbine rotor yoke clamp plate, every 30 along radially setting up installation screw hole 2 on yoke clamp plate 1, wherein the radial distance is equallyd divide when being equal to or greater than 1m and is set up 3 installation screw holes 2, set up 2 installation screw holes 2 when < 1m, corresponding with upper portion, 3 with the balancing weight close fixed mounting in 1 lower part of hydraulic turbine rotor yoke clamp plate, balancing weight 3 is with the location tang 4 location installation on the yoke clamp plate, close fixed mounting in 1 lower part of yoke clamp plate through the bolt, with bolt 5 with 3 tight balancing weights, become m omega with formula F ═ m omega-2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular speed of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the combined bolts, locking glue is coated at the thread position of the bolt after the bolt is pre-tightened, welding is carried out in the form of an angle welding seam, and the installation of the balancing weight is completed.
Claims (1)
1. A method for balancing weight of a dynamic balance magnet yoke of a hydroelectric generating set is characterized in that: the method comprises the following steps:
1) carry out the counter weight in the counter weight position of the upper portion reservation of hydroelectric set's rotor yoke clamp plate (1), on hydraulic turbine rotor yoke clamp plate (1), circumference uses 30 as the angle of cut apart, every 30 along radially setting up installation screw hole (2) on yoke upper portion, wherein radial distance sets up 3 installation screw hole (2) when being greater than or equal to 1m, set up 2 installation screw hole (2) when < 1m, location tang (4) location installation on balancing weight (3) are used for the yoke clamp plate, close fixed mounting on yoke clamp plate (1) upper portion through the bolt, with bolt (5) with balancing weight (3) tight, with formula F for m omega tight2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular speed of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the combined bolts, locking glue is coated at the thread position of the bolt after the bolt is pre-tightened, and the balancing weight is welded in an angle welding seam mode;
2) install the setting of the radial screw hole of balancing weight in hydraulic turbine rotor yoke clamp plate (1) lower part, every 30 along radially setting up installation screw hole (2) on yoke clamp plate (1), wherein divide equally when radial distance is greater than or equal to 1m and set up 3 installation screw hole (2), set up 2 installation screw hole (2) when < 1m, it is corresponding with upper portion, with balancing weight (3) to closing fixed mounting in hydraulic turbine rotor yoke clamp plate (1) lower part, balancing weight (3) are with location tang (4) location installation on the yoke clamp plate, close fixed mounting in yoke clamp plate (1) lower part through the bolt, with bolt (5) with balancing weight (3) tight, with formula F ═ m omega2And (3) calculating r/a to obtain the shearing stress borne by the bolt, and determining the added pretightening force, wherein: f is the centrifugal force borne by the bolt, m is the mass of the balancing weight, omega is the angular speed of the rotating speed of the unit, r is the distance between the balancing weight and the axis of the unit, a is the number of the combined bolts, locking glue is coated at the thread position of the bolt after the bolt is pre-tightened, welding is carried out in the form of an angle welding seam, and the installation of the balancing weight is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371152.8A CN111446793A (en) | 2020-05-06 | 2020-05-06 | Dynamic balance magnet yoke counterweight method for hydroelectric generating set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010371152.8A CN111446793A (en) | 2020-05-06 | 2020-05-06 | Dynamic balance magnet yoke counterweight method for hydroelectric generating set |
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| CN111446793A true CN111446793A (en) | 2020-07-24 |
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| CN202010371152.8A Pending CN111446793A (en) | 2020-05-06 | 2020-05-06 | Dynamic balance magnet yoke counterweight method for hydroelectric generating set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994337A (en) * | 2021-02-20 | 2021-06-18 | 浙江富春江水电设备有限公司 | Fluid machinery rotating part stress self-adaptation structure |
| CN113172412A (en) * | 2021-05-06 | 2021-07-27 | 哈尔滨电机厂有限责任公司 | Mounting method of dynamic balance weight block of hydraulic generator |
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| DE102012110147A1 (en) * | 2012-10-24 | 2014-04-24 | Thyssenkrupp Presta Teccenter Ag | Rotor for asynchronous motor, has screw element extended concentrically to rotor axis between end disks and provided for connecting end disks with one another under tension, where disk set is centered between end disks around rotor axis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994337A (en) * | 2021-02-20 | 2021-06-18 | 浙江富春江水电设备有限公司 | Fluid machinery rotating part stress self-adaptation structure |
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| CN113172412A (en) * | 2021-05-06 | 2021-07-27 | 哈尔滨电机厂有限责任公司 | Mounting method of dynamic balance weight block of hydraulic generator |
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Application publication date: 20200724 |