CN205336077U - Fixed -magnetic gap permanent magnet speed regulator - Google Patents

Abstract

The utility model relates to a permanent magnet governor with a fixed magnetic gap, which comprises an outer conductor rotor connected to an input shaft, a first inner magnetic rotor and a second inner magnetic rotor passing concentrically through the output shaft, the first The inner magnetic rotor is located inside the circumference of the second inner magnetic rotor; a second inner permanent magnet pressing plate is arranged between the second inner permanent magnet and the conductor. Because the utility model adopts the fixed magnetic gap structure, the meshing area of the governor is greatly increased, the assembly difficulty is reduced, rare earth materials are saved, and the torque transmission capacity is greatly improved. Due to the magnetic circuit adjustment structure, the overall volume of the governor is greatly reduced, which not only reduces material consumption and saves installation space, but also brings convenience to on-site installation and construction. Space is saved by arranging the first inner magnetic rotor inside the second inner magnetic rotor, and the second permanent magnet pressure plate acts as a protective barrier between the second permanent magnet and the outer rotor conductor to prevent debris, The sundries etc. are thrown out to the outer conductor rotor.

Description

A permanent magnet governor with fixed magnetic gap

technical field

The utility model relates to a permanent magnet governor, in particular to a permanent magnet governor with a fixed magnetic gap.

Background technique

The permanent magnet speed governor uses the magnetic coupling speed of the permanent magnet to realize the soft (magnetic) connection between the motor and the load, without any harmonic generation affecting the power grid, and has high reliability. , Inflammable and explosive, voltage instability and lightning and other harsh environments, greatly reducing mechanical vibration, widely used in electric power, steel, metallurgy, petrochemical, papermaking, municipal, ships, irrigation and mining industries. At present, the commonly used permanent magnet governors realize the speed adjustment by adjusting the air gap. The magnetic circuit regulator consumes a lot of power, and has disadvantages such as poor torque transmission capability, high assembly difficulty, and waste of a large amount of rare earth resources. In order to solve the above problems, the patent CN2014207550169 proposes a permanent magnet governor with a fixed magnetic gap. The first and second inner permanent magnet rotors are arranged in parallel along the length direction of the driven shaft, which takes up a large space; There is no protective barrier in the middle of the second inner permanent magnet rotor and the outer conductor rotor, so the safety is low.

Contents of the invention

In view of the above problems, the utility model provides a permanent magnet governor with a fixed magnetic gap, which can reduce the power consumption of the magnetic circuit regulator, improve the torque transmission capacity, reduce the difficulty of assembly, and save rare earth resources.

The current permanent magnet speed governors realize torque adjustment by changing the air gap between the conductor rotor and the permanent magnet rotor to control the amount of magnetic field lines cut by the conductor rotor. Since there are many disadvantages in this way, the utility model is based on The principle of electromagnetic, starting from keeping the magnetic gap constant and changing the number of magnetic force lines to design a new permanent magnet governor, by controlling the magnetic size of the permanent magnet rotor to the outside, so as to achieve the purpose of changing the torque.

In order to solve the above problems, the technical solution adopted by the utility model is: a permanent magnet speed governor with a fixed magnetic gap, including an outer conductor rotor connected to the input shaft, a first inner magnetic rotor and a second magnetic rotor passing concentrically through the output shaft. Two inner magnetic rotors, the first inner magnetic rotor is located inside the circumference of the second inner magnetic rotor; the outer conductor rotor has conductors distributed along its inner circumferential surface; the first inner magnetic rotor and the second inner magnetic rotor The inner magnetic rotors have at least one first inner permanent magnet and second inner permanent magnets evenly distributed along their respective circumferential surfaces, the number of the first inner permanent magnets and the second inner permanent magnets are the same, and the inner permanent magnets on each inner magnetic rotor The magnetic poles of the permanent magnets are arranged along the circumferential direction, and the magnetic poles on the adjacent sides of two adjacent inner permanent magnets on the same inner magnetic rotor are the same, and the magnetic pole faces of the first inner permanent magnet and the second inner permanent magnet are respectively provided with a first iron yoke and a second iron yoke. Two iron yokes; a second inner permanent magnet pressure plate is arranged between the second inner permanent magnet and the conductor, and a magnetic circuit adjustment for driving the first inner magnetic rotor to rotate relative to the second inner magnetic rotor is arranged on the first inner magnetic rotor The device is used to adjust the positional relationship of the same-named magnetic poles of the inner permanent magnets on the two inner magnetic rotors.

The magnetic circuit adjuster is used to adjust the positional relationship between the first inner permanent magnet and the second inner permanent magnet with the same poles, and then change the magnetic strength displayed to the outside. Governor principle: when the conductor rotor rotates, it moves relative to the internal permanent magnet rotor. The permanent magnetic field generates eddy currents on the conductor rotor. At the same time, the eddy currents generate an induced magnetic field that interacts with the permanent magnetic field, and finally drives the permanent magnet rotor along the same path as the conductor rotor. Direction rotation, thereby driving the output shaft connected to the permanent magnet rotor to rotate and output power. The output power is proportional to the magnetic field strength (magnetic force line strength) of the permanent magnet rotor, and the magnetic field strength of the permanent magnet rotor is controlled by the magnetic circuit regulator. Therefore, in the utility model, the magnetic circuit regulator can control the rotation of the second inner magnetic rotor to change the magnetic properties displayed by the first and second iron yokes, thereby causing the difference in the rotational speed of the outer conductor rotor and the output shaft to finally realize speed regulation the goal of. Specific adjustment process: Rotate the first inner magnetic rotor through the magnetic circuit regulator. When the second inner permanent magnet and the same-named magnetic pole of the first inner permanent magnet are in the corresponding position, both the first iron yoke and the second iron yoke will be magnetized. The strong magnets with corresponding polarities show the strongest magnetism to the outside; on the contrary, when the second inner permanent magnet and the different poles of the first inner permanent magnet are in the corresponding positions, the magnetic field lines pass through the first iron yoke and the second iron yoke. The yoke passes through smoothly, the internal short circuit, the first iron yoke and the second iron yoke do not show magnetism to the outside; according to the rotation angle of the second inner magnetic rotor, affected by the change of the magnetic circuit, the first iron yoke and the second iron yoke show externally The magnetism of the magnet varies from weakest to strongest (or from strongest to weakest). Compared with changing the axial distance between the conductor rotor and the permanent magnet rotor, this method reduces the power consumption of the magnetic circuit regulator and improves the torque transmission capacity.

The first inner magnetic rotor is located inside the second inner magnetic rotor to save internal space, and there is a second permanent magnet pressure plate between the second permanent magnet and the outer rotor conductor to act as a protective barrier to prevent debris and sundries Wait until it is thrown out to the outer conductor rotor.

The magnetic circuit regulator includes an actuator for receiving control signals.

The actuator can be an electric actuator, a pneumatic actuator or a hydraulic actuator. During use, the permanent magnet governor is installed in a certain control system, and the pressure, flow, liquid level or other control signals are received and processed by the control system, and then provided to the actuator, and the actuator of the actuator controls the first The rotation of the inner magnetic rotor changes the magnitude of the magnetism displayed to the outside by the first iron yoke and the second iron yoke.

Because the utility model adopts the fixed magnetic gap structure, the meshing area of the governor is greatly increased, the assembly difficulty is reduced, rare earth materials are saved, and the torque transmission capacity is greatly improved. Due to the use of the magnetic circuit adjustment structure, the power consumption of the executive adjustment mechanism is greatly reduced and the volume of the adjustment actuator is minimized, thereby greatly reducing the overall volume of the governor, which not only reduces material consumption and saves installation It also brings convenience to on-site installation and construction. Space is saved by arranging the first inner magnetic rotor inside the second inner magnetic rotor, and the second permanent magnet pressure plate acts as a protective barrier between the second permanent magnet and the outer rotor conductor to prevent debris, The sundries etc. are thrown out to the outer conductor rotor.

Description of drawings

Fig. 1 is the schematic diagram of the utility model assembly;

Fig. 2; A-A sectional schematic diagram for the utility model;

Among them: 1. Output shaft, 2. The first inner magnetic rotor, 3. The second inner magnetic rotor, 4. The second inner permanent magnet, 5. The first inner permanent magnet, 6. The second inner permanent magnet pressure plate, 7. Conductor, 8. outer conductor rotor, 9. actuator, 10. second iron yoke, 11 first iron yoke, 12. input shaft.

detailed description

A permanent magnet speed governor with a fixed magnetic gap, including an outer conductor rotor 8 connected to an input shaft 12 and a first inner magnetic rotor 2 and a second inner magnetic rotor 3 passing through an output shaft 1 concentrically. An inner magnetic rotor 2 is located inside the circumference of the second inner magnetic rotor 3; the outer conductor rotor 8 has conductors 7 distributed along its inner circumferential surface; the first inner magnetic rotor 2 and the second inner magnetic rotor 3 At least one first inner permanent magnet 5 and second inner permanent magnet 4 are evenly distributed along the circumferential direction of the respective circumferential surface respectively, and the first inner permanent magnet 5 and the second inner permanent magnet 4 have the same number, and the number of the first inner permanent magnet 5 and the second inner permanent magnet 4 is the same. The magnetic poles of the inner permanent magnets are arranged along the circumferential direction, and the magnetic poles on the adjacent sides of two adjacent inner permanent magnets on the same inner magnetic rotor are the same. Iron yoke 11 and second iron yoke 10; there is a second inner permanent magnet pressing plate 6 between the second inner permanent magnet 4 and the conductor 7, and the first inner magnetic rotor 2 is provided with a drive for driving the first inner magnetic rotor 2 relative The magnetic circuit regulator for the rotation of the second inner magnetic rotor 3 is used to adjust the positional relationship of the same-named magnetic poles of the inner permanent magnets on the two inner magnetic rotors. The magnetic circuit regulator includes an actuator 9 for receiving control signals, and the actuator 9 can be an electric actuator, a pneumatic actuator or a hydraulic actuator.

Claims (3)

1. the permanent-magnet speed governor of a fixing magnetic gap, it is characterized in that: include the outer conductor rotor (8) that is connected with power shaft (12) and in the first of output shaft (1) concentric traverse magnet rotor (3) in magnet rotor (2) and second, in described first, magnet rotor (2) is positioned at the second magnet rotor (3) inside circumference；Described outer conductor rotor (8) has conductor (7) along its inner peripheral surface is circumferentially distributed；In described first, in magnet rotor (2) and second, magnet rotor (3) is evenly distributed with at least one permanent magnet (4) in permanent magnet (5) and second in first along respective periphery circumference respectively, in first, permanent magnet (5) is identical with permanent magnet in second (4) quantity, interior permanent magnet pole on each interior magnet rotor is circumferentially arranged and on same interior magnet rotor, permanent magnet sides adjacent magnetic pole is identical in adjacent two, in first, in permanent magnet (5) and second, the magnetic pole end face side of permanent magnet (4) is respectively equipped with the first iron yoke (11) and the second iron yoke (10)；In second, between permanent magnet (4) and conductor (7), it is provided with in second permanent magnet pressing plate (6), magnet rotor (2) is provided with for driving magnet rotor in first (2) the magnetic circuit actuator that magnet rotor (3) rotates in second in first, for regulating in two the position relationship of permanent magnet magnetic pole of the same name on magnet rotor。

2. the permanent-magnet speed governor of fixing magnetic gap according to claim 1, it is characterised in that: described magnetic circuit actuator includes the actuator (9) for receiving control signal。

3. the permanent-magnet speed governor of fixing magnetic gap according to claim 2, it is characterised in that: described actuator (9) can be electric operator, pneumatic actuator or hydraulic actuating mechanism。