JP3103914U - Magnetic bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To counterbalance the same magnetic poles of magnets on a stator side and a rotor side by floating a load on a rotor side by a repulsive magnetic force, and to support an axial end of a rotor shaft by a buffer means. The balance state is complemented, and vibration and minute displacement due to rotation on the rotor side are suppressed.
An annular magnetic field (ms) is formed at an outer peripheral opening of a stator magnet (3a) in which a yoke is attached to a magnetic pole surface, and a stator (3) in which an inner peripheral magnetic field is closed is opposed to the same magnet and the same magnetic pole. The rotor magnet 2a with the yoke attached thereto is arranged, a magnetic field mr is formed on the opening side of the outer periphery of the yoke, the inner peripheral magnetic field is closed, and the rotor shaft 1 is attached to the rotor 2 fitted in the center of the inner peripheral position. The shaft is passed, the shaft is passed through the center of the stator 3, the magnetic field mr on the rotor side is surrounded by the magnetic field ms on the stator side, and the repulsive magnetic force between the two magnetic fields causes the load on the rotor side to float and balance. , And the axial end position of the rotor shaft is pivotally supported by a ball 5 to complement the equilibrium state, thereby suppressing vibration and minute displacement during rotation of the rotor.
[Selection diagram] FIG.

Description

  The present invention relates to a magnet bearing that utilizes repulsion generated by opposing the same magnetic poles of a pair of magnets.

  As a non-contact type magnetic bearing utilizing a repulsion force generated to oppose the same pole of the pair of permanent magnets faces the poles between and outer two magnets among of repeated cup-shaped permanent magnet as respective same poles By the repulsive force between the two magnets, the two magnets are isolated, the outer magnet is fixed as a stator, the inner shaft is fixed to the rotating shaft as a rotor, and the axial load applied to the shaft and the repulsive force between the two magnets And a method of supporting them in a non-contact state by balancing them.

  However, when the shallow depth of the cup-shaped magnet, with respect to variations in radial load of the rotor side, prone skidding like displacement, becomes unstable, and if the diameter difference of the inner and outer the magnets increases tends to produce suction between the inner and outer cross pole, unstable factors, Russia - regulation and control is very difficult ter side of axial load, for vibration displacement due to variation and rotation of the rotor side, such as unbalance radial load is there.

  In order to solve the above problems, the present invention opposes the same magnetic poles of the magnets on the stator side and the rotor side, supports the load on the rotor side in a floating state by repulsive magnetic force, and buffers the axial end of the rotor shaft. To complement the levitation state, thereby suppressing vibration and minute displacement due to rotation on the rotor side.

  This invention is ring-shaped and the stator magnet, a ferromagnetic plate of dished to one pole face lower magnet, an annular opening around by adhering each disk-shaped ferromagnetic plate to another pole face upper A stator is formed by forming a ring-shaped magnetic field, and a ring-shaped inner part is attached to the stator yoke to close the magnetic field, and is laid on a stator base on a frame. oppositely disposed ring-shaped rotor magnet, the same magnet deposited rotor yoke by an annular ferromagnetic plate of U-shaped cross-section sandwiched magnetic poles, and a magnetic field on the opening side of the yoke outer periphery, a magnetic field The rotor shaft which passes through the rotor fitted in the center of the closing side to be closed passes through the stator concentrically, and the magnetic field of the rotor yoke is surrounded by the magnetic field of the stator yoke. And b The axial load and the radial load on the rotor side are repelled, and the rotor side is lifted up to support the balanced state, and the axial end of the rotor shaft is brought into contact with the positioning ball of the ball plunger provided on the frame. It is pivotal, complements the equilibrium state, and suppresses vibration and small displacement caused by rotation on the rotor side.

  Then, a ring-type stator magnet, a ferromagnetic plate of dished to one pole face lower magnet, the annular opening around by adhering each disk-shaped ferromagnetic plate to another pole face upper provided by forming a magnetic field of an annular, constitute a stator laid on the stator based on the frame by a stator yoke that closes the magnetic contacts wearing inner position of the ring, the stator magnets upper faces of the same magnetic pole place a ring of rotor magnets Te, deposited rotor yoke in the magnet of annular ferromagnetic plate of U-shaped cross-section sandwiched magnetic poles, and a magnetic field on the opening side of the yoke outer periphery to close the magnetic field The rotor shaft that passes through the rotor fitted in the center of the closed side passes through the stator concentrically, the magnetic field of the rotor yoke is surrounded by the magnetic field of the stator yoke, and the repulsive magnetic force between the two magnetic fields causes the rotor shaft and the rotor to rotate. Repulses the axial load and radial load on the rotor side, floats the rotor side to support the rotor in a balanced state, and at the axial end of the rotor shaft, contacts the positioning ball loosely fitted to the shock absorber mounted on the frame. It is characterized by being pivoted to complement the equilibrium state, and to buffer and suppress vibration and minute displacement caused by rotation on the rotor side.

  In the magnetic bearing of claims 1 and 2, the lines of magnetic force are concentrated at the outer peripheral opening of the stator yoke provided on the magnetic pole surface of the stator magnet, an annular magnetic field is obtained, and the magnetic field of the rotor magnet is surrounded inside the magnetic field. Thus, the rotor magnet is held in a floating state in the magnetic field on the stator side by the repulsive magnetic force between the same magnetic poles of the two magnets, and can be freely rotated to minimize the bearing resistance.

  Then, the stator magnet and the rotor magnet form a magnetic field in which magnetic lines of force are densely formed on the opening side of the yoke of the ferromagnetic plate attached to the magnetic pole surface, and can block the magnetic field on the closing side. A permanent magnet that is magnetized in the thickness direction and easy to manufacture is applied.

  Also, by the same repulsive magnetic force of the stator magnet and the rotor magnet, the axial load and the radial load on the rotor side are repelled, and the rotor side floats to support the balanced state, and at the axial end of the rotor shaft, When the axial load is excessive, the part of the load is shared and supported. When the axial load is excessive, the axial load is too small due to the repulsive magnetic force. At this time, a part of the upward axial load is shared and supported, and the above-mentioned balanced state is complemented, and the positioning accuracy as a bearing can be improved.

  In addition, the above-mentioned positioning ball shares a small part of the axial load on the axis of the rotor shaft, and the arm of the ball's frictional moment with respect to the coaxial line is extremely small, so that the ball's frictional moment as a pivot bearing is minimized. Can be suppressed.

  Further, in the magnetic bearing of claim 2, the concave spherical surface formed in the axial end position of the rotor shaft, positioning is performed on the pivot 支状 contact positioning ball 5, shock absorbers were 支設 the ball to the frame F 5b, and the vibration and displacement generated by the rotation of the rotor and the rotor shaft can be suppressed by the shock absorbing function of the shock absorber.

  When the bearing load is insufficient in large single bearing load capacity, communicating and set overlapping a plurality of magnetic bearings to comb, increases the bearing load capacity, it is possible to form a magnetic bearing of a simple and high capacity.

  Magnetic bearing of claim 1-2, primarily, although an axial load of the rotor axis is applied to the bearings of a large vertical shaft type, and pivoted the shaft end portion by positioning the ball, a small horizontal relatively radial load It can also be applied to shafts.

  3 embodiment, the stator magnets 3a of the ring, a ferromagnetic plate of dished to one pole face lower magnet, was coated each of the disc-shaped ferromagnetic plate to another pole face upper periphery and an opening of the annular form a magnetic field ms annular constitute a stator 3 is laid on stator base 4 on the frame F by a stator yoke 3b which closes the magnetic field against wearing inner position of the ring in , the stator magnets 3a upper, opposite the same pole is disposed a ring-shaped rotor magnet 2a, the same magnet deposited rotor yoke 2b by an annular ferromagnetic plate of U-shaped cross-section sandwiched magnetic poles, the yoke A magnetic field mr is formed on the opening side of the outer periphery, and a rotor shaft 1 that passes through a rotor 2 fitted in the center of the closing side that closes the magnetic field passes through the stator 3 concentrically, and the magnetic field mr of the rotor yoke 2b is Stator yoke 3 And a surrounded by the magnetic field ms, due to the repulsive magnetic force between the two magnetic fields, repel axial load and radial load of the rotor axis and the rotor side, it is assumed that supports the balanced condition emerged rotor side.

  Here, the stator magnet 3a and the rotor magnet 2a set a magnetic field by the stator yoke 3b and the rotor yoke 2b, and both employ a so-called ring-shaped permanent magnet. It is formed of a non-magnetic material so as not to affect the lines of magnetic force around the rotor shaft 1 of the stator magnet 2a and the stator magnet 3a.

  In the embodiment of FIG. 2, the positioning balls 5, 5 of the ball plungers 5a, 5a mounted on the frame F are brought into contact with the axial end of the rotor shaft 1 to pivotally support the rotor shaft 1. The balance is complemented, and vibration and minute displacement due to rotation on the rotor side are suppressed.

  Embodiment of Figure 3, in the above-described structure, the ball plunger 5a, instead of 5a, the axis end position of the rotor shaft 1, the positioning ball 5 which is loosely fitted in the shock absorber 5b that 支設 the frame F When the rotor is rotated on the rotor side, vibrations and minute displacements caused by fluctuations in the balanced state are buffered and suppressed.

  The embodiment of FIG. 4, when the bearing load is a shortage in the large single bearing load capacity, the stator 3, a plurality of magnetic bearing of the above configuration consecutively provided to overlap the comb including a rotor 2 to the rotor shaft 1, the bearing The load capacity is increased to form a simple and large-capacity magnetic bearing.

  The present invention is mainly applied to rotating devices such as wind turbines, gyros, flywheel devices and centrifugal force devices having a vertical axis, minimizing bearing resistance, suppressing vibration at high speed rotation, and reducing magnetic loss with little mechanical wear. It is intended to provide a bearing.

  FIG. 3 is a plan view of the magnetic bearing of the present invention.   It is an expanded sectional view in AA of FIG. (Example 1)   It is an expanded sectional view in AA of FIG. (Example 2)   FIG. 3 is a cross-sectional view of an embodiment in which the magnetic bearings of FIGS. (Example 3)

Explanation of reference numerals

REFERENCE SIGNS LIST 1 rotor shaft 1a concave spherical surface 2 rotor 2a rotor magnet 2b rotor yoke 3 stator 3a stator magnet 3b stator yoke 4 stator base 5 positioning ball 5a ball plunger 5b shock absorber 6 rotating body F frame mr rotor side magnetic field ms stator side Magnetic field N N pole S S pole

Claims (2)

  A ring-shaped stator magnet (3a), a dish-shaped ferromagnetic plate is attached below one magnetic pole surface of the magnet, and a disk-shaped ferromagnetic plate is attached above the other magnetic pole surface, and an annular opening is formed around the periphery. the provided to form an annular field (ms), a ring-shaped inner position wearing contact with stator based on the frame constitute a stator (3) occluded and stator yoke (3b) of the magnetic field (F) ( laid in 4), a rotor according to the stator magnet (3a) higher, the magnetic pole facing the place ring of the rotor magnet (2a), the same magnetic annular ferromagnetic plate of U-shaped cross-section sandwiched magnetic poles deposited yoke (2b), and a magnetic field (mr) on the opening side of the yoke outer periphery, the rotor shaft passing through the shaft to the rotor (2) which is fitted to the closed side central for closing the magnetic field (1) stator (3) Concentrically, the rotor yoke (2b The magnetic field (mr) is surrounded by the magnetic field (ms) of the stator yoke (3b), and the axial load and radial load on the rotor shaft and the rotor side are repelled by the repulsive magnetic force between the two magnetic fields, and the rotor is lifted up. While supporting in a balanced state, the positioning end (5, 5) of the ball plunger (5a, 5a) supported on the frame (F) is brought into contact with the axial end of the rotor shaft (1) to pivot. A magnetic bearing that complements the balanced state and suppresses vibration and minute displacement caused by rotation of the rotor.   A ring-shaped stator magnets (3a), a ferromagnetic plate of dished to one pole face lower magnet, an annular opening around by adhering each disk-shaped ferromagnetic plate to another pole face upper To form a ring-shaped magnetic field (ms), and a stator yoke (3b) that is closed by a ring-shaped inner part to close the magnetic field to form a stator (3) and a stator base (3) on a frame (F). 4), a ring-shaped rotor magnet (2a) is disposed above the stator magnet (3a) with the same magnetic poles facing each other, and the rotor is a rotor formed by a U-shaped annular ferromagnetic plate sandwiching both magnetic poles. deposited yoke (2b), and a magnetic field (mr) on the opening side of the yoke outer periphery, the rotor shaft passing through the shaft to the rotor (2) which is fitted to the closed side central for closing the magnetic field (1) stator (3) Concentrically, the rotor yoke (2b The magnetic field (mr) is surrounded by the magnetic field (ms) of the stator yoke (3b), and the axial load and the radial load on the rotor shaft and the rotor side are repelled by the repulsive magnetic force between the two magnetic fields. while bearing in balanced condition, the axis end position of the rotor shaft (1), by contacting a shock absorber that 支設 the frame (F) (5b, 5b) tooling ball (5,5) which loosely fit into A magnetic bearing which pivotally supports and complements the equilibrium state, and buffers and suppresses vibration and minute displacement caused by rotation on the rotor side.

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