JP2010279230A - Axial magnetic levitation motor, and axial magnetic levitation centrifugal pump with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial magnetic levitation motor which is compact and weight and is capable of generating a high torque and has a configuration that facilitates control over an axial position, rotation, and tilt to facilitate control over the axial position, rotation, and tilt, and to provide an axial magnetic levitation centrifugal pump. <P>SOLUTION: A salient pole of an upper stator is wound with an upper axial position/rotation control coil that controls the axial position and rotation of a rotor and an upper tilt control coil that controls the tilt of the rotor. A salient pole of a lower stator is wound with a lower axial position/rotation control coil that controls the axial position and rotation of the rotor and a lower tilt control coil that controls the tilt of the rotor. The upper axial position/rotation control coil and the upper tilt control coil are arranged to be symmetrical with the lower axial position/rotation control coil and the lower tilt control coil along the axial direction of the rotor. The upper stator and the lower stator control the rotation of the rotor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an axial type magnetic levitation motor and an axial type magnetic levitation centrifugal pump equipped with an axial type magnetic levitation motor, and more particularly to an axial type magnetic levitation motor and an axial type magnetic levitation motor that realize a small and light magnetic levitation artificial heart. The present invention relates to an axial type magnetic levitation centrifugal pump.

  In particular, the present invention includes a rotor and an upper stator disposed at the upper portion of the rotor and a lower stator disposed at the lower portion of the rotor along the axial direction of the rotor, and the rotor is axially magnetically levitated along the axial direction of the rotor. The present invention relates to an axial magnetic levitation motor that rotates in a non-contact state around the axis of a rotor, and an axial magnetic levitation centrifugal pump including the axial magnetic levitation motor.

  As a magnetic levitation motor configured to rotate in a non-contact state around the axis of the rotor while axially levitating along the axial direction of the rotor by the action of magnetism, for example, a magnetic levitation rotary motor, a high-speed rotary machine, a machine tool There are applications to high-speed spindles, as well as centrifugal pumps for artificial hearts in the medical field as examples of applications thereof. As a magnetic levitation motor system, an axial type magnetic levitation motor and an axial type magnetic levitation centrifugal pump that control the axial position of the rotor and the rotation of the rotor along the axial direction of the rotor are known. (Patent Document 1)

  The axial type magnetic levitation motor disclosed in Patent Document 1 has a configuration in which an upper stator is disposed above a rotor, a lower stator is disposed below, and a ring-shaped outer permanent magnet is disposed around the rotor. The electromagnet of the upper stator cooperates with the upper permanent magnet on the upper surface of the rotor to control the axial position and inclination of the rotor, and the lower stator cooperates with the permanent magnet on the lower surface of the rotor to control the rotation of the rotor. In this axial type magnetic levitation motor, fluctuations or vibrations in the radial direction of the rotor are suppressed by the mutual repulsive force between the ring-shaped inner permanent magnet provided on the rotor circumferential surface and the ring-shaped outer permanent magnet concentrically arranged therewith. Supporting the rotor with radial passive stability.

  In the axial type magnetic levitation motor disclosed in Patent Document 1 described above, the four electromagnets provided on the upper stator exert an attractive force on the rotor to control the position of the rotor in the axial direction. The rotation control is not combined. On the other hand, the electromagnet of the lower stator is responsible for rotation control. Therefore, the position of the rotor in the axial direction is controlled for generating a bias magnetic flux magnetized in the axial direction of the rotor in the upper stator, and the rotation of the rotor is performed by the lower stator. That is, the upper stator performs axial control in the rotor axis Z direction, and the lower stator performs rotation control around the rotor axis Z.

  In the axial type magnetic levitation motor shown in Patent Document 1 described above, the electromagnet provided in the upper stator functions as an inclination control electromagnet that controls the inclination of the rotor in cooperation with the upper permanent magnet of the rotor. Yes. That is, the electromagnet of the upper stator is responsible for controlling the inclination of the rotor deviating from the axis Z.

  In the axial type magnetic levitation motor shown in Patent Document 1 described above, the upper stator includes a lower stator that controls the position of the rotor and the tilt of the rotor, and controls the rotation of the rotor and generates a bias force for the upper stator. The axial position control is performed by balancing the attractive force of the upper stator and the magnetic attractive force of the lower stator. The rotor tilt control is performed based on a bias magnetic flux generated by a permanent magnet and a magnetic flux generated by an electromagnet.

  The axial type magnetic levitation motor disclosed in the above-mentioned Patent Document 1 relates to an axial type magnetic levitation motor realized by a magnetic levitation artificial heart for saving lives of adult circulatory and respiratory disease patients. The rotor's diameter, that is, the radial dimension is large and the rotor's weight increases, and the upper and lower magnetic attraction forces of different roles of the upper stator responsible for magnetic levitation and the lower stator responsible for the motor function are balanced. .

JP 2005-16677 A

  The problem to be solved by the present invention is to provide a small and lightweight axial type magnetic levitation motor having a small dimension in the radial direction and an axial type magnetic levitation centrifugal pump provided with the axial type magnetic levitation motor.

  The problem to be solved by the present invention is to provide an axial type magnetic levitation motor and an axial type magnetic levitation centrifugal pump provided with an axial type magnetic levitation motor and a simple configuration of rotor axial position and rotation control and rotor tilt control. There is.

  The problem to be solved by the present invention is to provide an axial type magnetic levitation motor and an axial type magnetic levitation centrifugal pump equipped with an axial type magnetic levitation motor that can easily control the axial position and rotation of the rotor and the tilt control of the rotor. It is in.

  An object of the present invention is to provide an axial type magnetic levitation motor that is small and capable of generating high torque, and an axial type magnetic levitation centrifugal pump including the axial type magnetic levitation motor.

  The problem to be solved by the present invention is to provide an axial magnetic levitation motor capable of controlling the rotation of the rotor by both the upper stator and the lower stator, and an axial magnetic levitation centrifugal pump including the axial magnetic levitation motor. is there.

In order to achieve the above object, the present invention comprises a rotor and at least one stator,
The stator has salient poles that are spaced apart from the rotor along the axial direction of the rotation center axis of the rotor, and protrude and extend toward the rotor,
A surface of the rotor facing the stator is provided with a permanent magnet,
An axial position / rotation control coil for controlling the axial position and rotation of the rotor, and a tilt control coil for controlling the tilt of the rotor are wound around the salient pole, thereby providing the stator. The axial position / rotation control coil and the tilt control coil are integrally formed, and an axial type magnetic levitation motor is provided.

Further, the present invention relates to the axial type magnetic levitation motor, the upper stator having a salient pole projecting and extending toward the rotor side, and spaced apart from the upper portion of the rotor along the axial direction of the rotor;
A lower stator that has a salient pole that protrudes and extends toward the rotor, and that is spaced apart from the lower portion of the rotor along the axial direction of the rotor;
An upper permanent magnet is provided on the axial upper surface of the rotor, and a lower permanent magnet is provided on the axial lower surface of the rotor,
An upper axial position position / rotation control coil for controlling the axial position and rotation of the rotor and an upper tilt control coil for controlling the tilt of the rotor are wound around the salient poles of the upper stator,
A lower axial position / rotation control coil for controlling the axial position and rotation of the rotor and a lower tilt control coil for controlling the inclination of the rotor are wound around the salient poles of the lower stator,
The upper axial position / rotation control coil and the upper tilt control coil, and the lower axial position / rotation control coil and the lower tilt control coil are symmetrical along the axial direction of the rotor. An axial type magnetic levitation motor is provided.

Arrangement of the upper axial position / rotation control coil and upper tilt control coil in the salient pole of the upper stator provided in the axial type magnetic levitation motor, and the lower axial position / rotation control in the salient pole of the lower stator There are at least six configurations for the arrangement of the coil and the lower inclination control coil. That is,
(1) The upper axial position / rotation control coil is wound around the base of the salient pole of the upper stator, and the upper tilt control coil is wound around the tip of the salient pole of the upper stator. It is provided by turning. The lower axial position / rotation control coil is wound around the base of the salient pole of the lower stator, and the lower tilt control coil is wound around the tip of the salient pole of the lower stator. Provided.
(2) The upper axial position / rotation control coil is wound around the base of the salient pole of the upper stator, and the upper tilt control coil is wound around the tip of the salient pole of the upper stator. It is provided by turning. The lower axial position / rotation control coil is wound around the tip of the salient pole of the lower stator, and the lower tilt control coil is wound around the base of the salient pole of the lower stator. Provided.
(3) The upper axial position / rotation control coil is wound around the tip of the salient pole of the upper stator, and the upper tilt control coil is wound around the base of the salient pole of the upper stator. It is provided by turning. The lower axial position / rotation control coil is wound around the tip of the salient pole of the lower stator, and the lower tilt control coil is wound around the base of the salient pole of the lower stator. Provided.
(4) The upper axial position / rotation control coil is wound around the tip of the salient pole of the upper stator, and the upper tilt control coil is wound around the salient pole of the upper stator. It is provided by turning. The lower axial position / rotation control coil is wound around the base of the salient pole of the lower stator, and the lower tilt control coil is wound around the tip of the salient pole of the lower stator. Provided.
(5) The upper tilt control coil and the upper axial position / rotation control coil are mixed and wound around the salient pole of the upper stator. The lower inclination control coil and the lower axial position / rotation control coil are provided by being mixed and wound around the salient poles of the lower stator.
(6) The upper axial position / rotation control coil is wound around the salient pole of the upper stator, and the lower axial position / rotation control coil is wound around the salient pole of the lower stator. The inclination control coil is wound around only one of the salient pole of the upper stator and the salient pole of the lower stator.

In the axial type magnetic levitation motor, the present invention may further include an attractive force generator that is spaced apart from the rotor along the axial direction of the rotor, and the attractive force generator generates an attractive force with respect to the rotor. In addition, the present invention provides an axial magnetic levitation motor characterized in that the attraction force and the magnetic attraction force generated by the stator are balanced so that the rotor is axially magnetically levitated along the axial direction. The suction force generator has at least the following configuration.
(1) It is comprised from the magnetic material part arrange | positioned and spaced apart by the lower side of the said rotor, and the permanent magnet provided in the said axial direction lower surface of the said rotor.
(2) It is comprised from the electromagnet or permanent magnet arrange | positioned and spaced apart by the lower side of the said rotor, and the magnetic material part affixed on the said axial lower surface of the said rotor.
(3) Gravity or some suction force acting on the rotor is used.

To achieve the above object, the present invention is an axial magnetic levitation centrifugal pump using the axial magnetic levitation motor,
A housing and a pump chamber formed in the housing;
An impeller is provided on the rotor;
An axial type magnetic levitation centrifugal pump is provided in which the rotor is disposed in the pump chamber.

  According to the present invention, in the axial type magnetic levitation motor, a small and lightweight axial type magnetic levitation motor having a small dimension in the radial direction could be obtained.

  According to the present invention, in the axial type magnetic levitation motor, it is possible to obtain an axial type magnetic levitation motor in which the configuration of the axial position of the rotor, the configuration of the rotation control, and the configuration of the rotor tilt control are simple.

  According to the present invention, in the axial type magnetic levitation motor, it is possible to obtain an axial type magnetic levitation motor that can easily control the axial position and rotation of the rotor and the tilt control of the rotor.

  According to the present invention, in the axial type magnetic levitation motor, an axial type magnetic levitation motor capable of generating a small and high torque can be obtained.

  According to the present invention, in the axial type magnetic levitation motor, an axial type magnetic levitation motor in which the rotation of the rotor can be controlled by both the upper stator and the lower stator can be obtained.

  According to the present invention, in the axial type magnetic levitation centrifugal pump provided with the axial type magnetic levitation motor, it is possible to obtain an axial type magnetic levitation centrifugal pump in which the axial position and rotation control of the rotor and the tilt control of the rotor are easy.

  In accordance with the present invention, an axial type magnetic levitation centrifugal pump having an axial type magnetic levitation motor and an axial type magnetic levitation centrifugal pump having an axial type magnetic levitation motor that can easily control the axial position and rotation of the rotor and the tilt of the rotor. Could get.

  According to the present invention, in the axial type magnetic levitation centrifugal pump provided with the axial type magnetic levitation motor, it is possible to obtain an axial type magnetic levitation centrifugal pump including an axial type magnetic levitation motor capable of generating a small and high torque.

  According to the present invention, in an axial type magnetic levitation centrifugal pump provided with an axial type magnetic levitation motor, an axial type magnetic levitation centrifugal pump provided with an axial type magnetic levitation motor that can be rotationally controlled by both the upper and lower stators is obtained. I was able to.

1 is an external perspective view showing a principle configuration of an embodiment of an axial type magnetic levitation motor according to the present invention. It is a block diagram which shows the control system structure in one Example of the axial type magnetic levitation motor by this invention shown in FIG. It is a top view which shows one Example of the rotor part in the axial type magnetic levitation motor by this invention. It is an external appearance perspective view which shows one Example of the stator in the axial type magnetic levitation motor by this invention. 1 is an external perspective view showing an embodiment of an axial direction control and rotation control coil, an inclination control coil, and a stator in an axial type magnetic levitation motor according to the present invention. It is a top view which shows the other Example of the rotor part in the axial type magnetic levitation motor by this invention. It is an external appearance perspective view which shows the other Example of the stator in the axial type magnetic levitation motor by this invention. It is an external appearance perspective view which shows the other Example of the coil for axial direction control and rotation control, the coil for inclination control, and the stator in the axial type magnetic levitation motor by this invention. It is a side view which shows one Example of the axial type magnetic levitation centrifugal pump provided with the axial type magnetic levitation motor by this invention. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9 in an embodiment of an axial magnetic levitation centrifugal pump including an axial magnetic levitation motor according to the present invention.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the axial type magnetic levitation motor of this invention and the axial type magnetic levitation centrifugal pump provided with this axial type magnetic levitation motor is demonstrated along the Example shown on drawing. FIG. 1 is an external perspective view showing the principle configuration of an embodiment of an axial type magnetic levitation motor according to the present invention.

The axial type magnetic levitation motor A shown in FIG. 1 mainly includes a rotor 1, a desk-type upper stator 2 disposed above the rotor 1 along the axis Z of the rotor 1, and a lower portion of the rotor 1 along the axis Z of the rotor 1. It is comprised from the desk-type lower stator 3 arrange | positioned. The rotor 1 is provided with two rotor yokes 8 on the top and bottom and six impellers 9 between the yokes , and two permanent magnets 10 are provided on the outer surface of the rotor yoke 8, respectively.

The axial type magnetic levitation motor A shown in FIG. 1 has an upper shaft that controls the axial position and rotation of the rotor 1 that generates a three-phase, two-pole rotating magnetic field at the base of the salient pole of the upper stator 2. and direction position and rotation control coil 4 is wound, the upper slope control coil 5 which controls the inclination of the rotor 1 the tip portion of the salient pole are wound. In addition, the root portion of the salient pole of the lower stator 3, lower axial position and rotation control coil 7 of the rotor 1 to generate a rotating magnetic field of the 3-phase 2-pole, the rotor to the tip portion of the impact-pole of the lower stator 3 A lower tilt control coil 6 for controlling the tilt of 1 is wound.

Further, in the axial type magnetic levitation motor A shown in FIG. 1, the rotor 1 is provided with two-pole permanent magnets 10 for levitation rotation on both surfaces in the axial direction. The rotor 1 is sandwiched from both sides in the axial direction by the upper stator 2 and the lower stator 3, and is magnetically supported in the axial direction and rotated by balancing the magnetic attractive forces generated by the upper stator 2 and the lower stator 3. Axial magnetic levitation motor A of the present embodiment, rotation control of the rotor 1 are crack row by an upper stator 2 and the lower stator 3 of the two stators.

In addition, the permanent magnets 10 are arranged on the upper and lower surfaces of the rotor 1 so as to be shifted by 90 degrees in the vertical direction, and the upper tilt control coil 5 and the lower tilt control coil 6 disposed in both the upper stator 2 and the lower stator 3 The inclination of 1 around the two axes in the radial direction is controlled. The radial position is statically supported using passive stability. The upper stator 2, the upper axial position / rotation control coil 4, the upper tilt control coil 5 and the lower stator 3, the lower axial position / rotation control coil 7, and the lower tilt control coil 6 are the axis X of the rotor 1. Are arranged symmetrically about the impeller on the surface formed by the axis Y.

Axial position control and rotation control of the rotor 1 in the axial type magnetic levitation motor A in FIG. 1, the upper portion the stator 2, the row of dividing using the stators of the lower stator 3. The axial position control of the rotor 1 is performed by a three-phase two-pole rotating magnetic field applied to both the upper axial position / rotation control coil 4 and the lower axial position / rotation control coil 7 of the upper stator 2 and the lower stator 3. The d-axis current is varied to balance the magnitude of the attractive force acting on the rotor 1 up and down. The rotation control of the rotor 1 is performed by generating rotational torque in both the upper stator 2 and the lower stator 3 by a q-axis current of a three-phase two-pole rotating magnetic field of U phase, V phase, and W phase. The axial position control and rotation control of the rotor 1 are performed independently using vector control.

In axial magnetic levitation motor A according to the embodiment of the present invention, the current value of the d-axis component, by using the current value of the q-axis component, rows that UGA independently controlling the rotation and axial attraction force of the rotor 1 The finally determined d-axis component current value and q-axis component current value are converted into a three-phase, two-pole rotating magnetic field, and the rotating magnetic field is applied to both the axial position and rotation control coils 4 and 6. This is done by controlling with a three-phase, two-pole rotating magnetic field.

Inclination control of the rotor 1 in the axial type magnetic levitation motor A shown in FIG. 1, row of dividing using both coils of the upper slope control coil 5 and the lower tilt control coil 6. Wrapped six six coils salient poles Ah is, to generate a magnetic flux in the same direction in all the tilt control coil, a magnetic attraction acting on the S pole side and the N pole of the permanent magnets arranged in the rotor 1 This is done by creating a power imbalance. As described above, the permanent magnet 10 disposed on the upper and lower surfaces of the rotor 1 is shifted 90 degrees vertically, and the upper tilt control coil 5 and the lower tilt control coil 6 disposed on both the upper stator 2 and the lower stator 3. The inclination of the rotor 1 around two radial directions is controlled.

In the axial type magnetic levitation motor A, the inclination of the rotor 1 around the X axis and around the Y axis is detected to control the inclination of the rotor 1. The permanent magnet 10 used for the inclination control rotates as the rotor 1. Therefore, the rotation angle is detected, and the inclinations around the X axis and the Y axis are converted into the inclinations of the rotating coordinate system, and the inclination control is performed.

A control system in the axial type magnetic levitation motor A of the present embodiment will be described. In FIG. 2, the upper axial position and rotation control coil 4, the lower axial position and rotation control coil 7, and the upper tilt control coil 5 and lower tilt control coil 6 provided in the axial type magnetic levitation motor A are shown. A detection signal representing the axial position / rotation control of the rotor 1 and the displacement of the tilt is sent to the control unit 23 via the A / D converter 22 from the corresponding overcurrent sensor 21. The control unit 23 is provided with an axial position control means 23a, the rotation control means 23b and the tilt control means 23c to thus upper axial position and rotation control coil 4 and the lower axial position and rotation control coil 7, and the upper Coil current values to be passed through the tilt control coil 5 and the lower tilt control coil 6 are calculated and output to an amplifier 25 connected to the power source 24.

  Thus, the upper tilt control coil 5 for generating the magnetic field α-phase and the lower tilt control coil 6 for generating the magnetic field β-phase and the U-phase, V-phase, and W-phase three-phase two-poles are generated. A current is input to each phase (U, V, W phase) of the upper axial position / rotation control coil 4 and the lower axial position / rotation control coil 7 that generate a rotating magnetic field via an amplifier 25. . Digital PID control is used for the control. High-speed digital signal processing is performed using dSPACE (trade name). The signal of the overcurrent sensor 21 is taken into the dSPACE via the A / D converter 22 and the current flowing through the upper inclination control coil 5 and the lower inclination control coil 6 is calculated and output to the amplifier (amplifier) 25. The control program of the control unit 23 is created using C language or the like, and as a specific example thereof, for example, MATLAB. 5.3simulik (trade name) is used.

Describing embodiments of the axial type magnetic levitation motor according to an embodiment of the present invention. Axial magnetic levitation motor A1 employs a Type 1-Nd-type motor using a neodymium magnet. FIG. 3 is a plan view showing an embodiment of a rotor portion in the axial type magnetic levitation motor A1 according to the present invention.

The rotor 31 of the axial type magnetic levitation motor A1 is composed of two permanent magnets, and a total of four permanent magnets 32a1 and 32a2 are attached to the rotor yoke of the rotor 31 to form a two-pole rotor 31. Yes. The shape of the permanent magnets 32a1, 32a2 is formed as a sector structure , and the thickness of each permanent magnet 32a1, 32a2 is 1 mm. The dimensions of the rotor yoke of the rotor 31 are an outer diameter of 24 mm, an inner diameter of 8 mm, and a thickness of 2 mm. The permanent magnets 32a1 and 32a2 are neodymium magnets. The rotor 31 includes two rotor yokes. One rotor yoke is opposed to another rotor yoke, and six impellers are provided between the two rotor yokes. A permanent magnet having the same shape is also provided on the surface of the other rotor yoke of the rotor 31.

A desk-type stator that cooperates with the rotor 31 shown in FIG. 3 will be described. FIG. 4 is an external perspective view showing an embodiment of a stator in the axial type magnetic levitation motor A1 according to the present invention.

The desk type stator 34 of the axial type magnetic levitation type motor A1 is composed of six salient poles 34a provided at equal intervals every 60 degrees. Salient poles 34a adopts a straight salient pole structure, cross-section adopts a sector structure. The stator 34 has an outer diameter of 24 mm, an inner diameter of 8 mm, and the salient pole 34a has a height of 5 mm.

The configuration of the axial position and rotation control axial position / rotation control coil and the inclination control coil related to the rotor 31 shown in FIG. 3 and the desk stator 34 shown in FIG. 4 will be described. FIG. 5 is an external perspective view showing an embodiment of an axial direction control / rotation control coil and an inclination control coil in the axial type magnetic levitation motor A1 according to the present invention.

  All six salient poles 34a of the stator 34 of the axial type magnetic levitation motor A1 are configured to generate a U-phase, V-phase, and W-phase three-phase two-pole rotating magnetic field for axial position / rotation control. An axial position / rotation control coil 35 (electromagnet coil) is wound around, and an inclination control coil (electromagnet coil) 36 is wound thereon so as to generate an α-phase or β-phase magnetic field for tilt control. It was. That is, the axial position / rotation control coil 35 is wound around the base of the salient pole 34a, and the tilt control coil 36 is wound around the tip of the salient pole 34a. The axial position / rotation control coil 35 and the inclination control coil 36 are made of a conductive wire having a wire diameter of 0.4 mm, and 27 turns are used for axial position / rotation control per salient pole, and 5 turns are used for inclination control.

Another embodiment of the axial magnetic levitation motor of the present invention will be described. Axial magnetic levitation motor A2 adopts the Type 2-Sm-type motor using a Type 2-Nd motor and samarium-based magnet using neodymium magnets. 6 is a plan view showing another embodiment of the rotor portion in the axial magnetic levitation motor A2 according to the present invention.

  The rotor 41 of the axial type magnetic levitation motor A2 is composed of two permanent magnets, and a total of four permanent magnets 42a1, 42a2 and permanent magnets 42b1, 42b2 are attached to the rotor yoke 43 to form a two-pole rotor. A motor rotor 41 is configured. The shapes of the permanent magnets 42a1 and 42a2 and the permanent magnets 42b1 and 42b2 are such that the magnetic flux density in the gap between the stator 44 and the rotor 41 is generated in a sine wave shape. The thickness of each permanent magnet 42a1, 42a2 and permanent magnet 42b1, 42b2 is 0.7 mm. The dimensions of the rotor yoke of the motor rotor 41 are an outer diameter of 24 mm, an inner diameter of 8 mm, and a thickness of 2 mm. The permanent magnets 42a1 and 42a2 and the permanent magnets 42b1 and 42b2 are of two types, a neodymium magnet and a samarium cobalt magnet. The rotor 41 includes two rotor yokes, and has another rotor yoke facing the rotor yoke, and six impellers are provided between the two rotor yokes. A permanent magnet having the same shape is also provided on the surface of the other rotor yoke of the rotor 41.

A desk-type stator 44 that cooperates with the rotor 41 shown in FIG. 6 will be described. FIG. 7 is an external perspective view showing another embodiment of the stator in the axial type magnetic levitation motor A2 according to the present embodiment .

  The desk type stator 44 of the above-described axial type magnetic levitation motor A2 is composed of six salient poles provided at equal intervals every 60 degrees. The salient pole 44a of the stator 44 employs a straight salient pole structure, and the cross section adopts a fan-shaped structure. The stator 44 has an outer diameter of 24 mm, an inner diameter of 16 mm, and the salient pole 44a has a height of 5 mm.

The configuration of the axial position and rotation control axial position / rotation control coil and the tilt control coil related to the rotor 41 shown in FIG. 6 and the desk type stator 44 shown in FIG. 7 will be described. FIG. 8 is an external perspective view showing an embodiment of an axial direction control / rotation control coil and an inclination control coil in the axial type magnetic levitation motor A2 according to the present invention.

  All six salient poles 44a of the stator 44 of the axial type magnetic levitation motor A2 generate a three-phase two-pole rotating magnetic field of U phase, V phase, and W phase for axial position and rotation control. An axial position / rotation control coil (electromagnet coil) 47 is wound around the coil, and a tilt control coil (electromagnet coil) 46 is wound thereon so as to generate an α-phase or β-phase magnetic field for tilt control. It was. That is, the axial position / rotation control coil 47 is wound around the base of the salient pole 44a, and the tilt control coil 46 is wound around the tip of the salient pole 44a. The axial position / rotation control coil 47 and the inclination control coil 46 were made of a conductive wire having a wire diameter of 0.4 mm, with 43 windings for axial position / rotation control per salient pole and 5 windings for tilt control.

Next, an axial type magnetic levitation centrifugal pump provided with an axial type magnetic levitation motor according to an embodiment of the present invention will be described. FIG. 9 is a side view showing an embodiment of an axial magnetic levitation centrifugal pump provided with an axial magnetic levitation motor according to an embodiment of the present invention. FIG. 10 is an axial magnetic levitation centrifugal provided with an axial magnetic levitation motor. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9 in the embodiment of the pump.

  The axial type magnetic levitation centrifugal pump P provided with this axial type magnetic levitation motor is mainly composed of a pump housing 51 that constitutes a fixed frame of the centrifugal pump P, a pump chamber 52 that is partitioned in the pump housing 51, and a suction port. 53 and a discharge port 54.

Further, in the axial type magnetic levitation centrifugal pump P provided with this axial type magnetic levitation motor, the axial type magnetic levitation motor A2 which is another embodiment described above is employed. That is, the configuration of the axial type magnetic levitation motor A2 comprising the rotor shown in FIG. 6, the stator shown in FIG. 7, the axial direction / rotation control coil and the tilt control coil shown in FIG. 8 is basically adopted. ing.

The axial type magnetic levitation centrifugal pump P is provided with a rotor 61. The rotor 61 is disposed in a pump chamber 52 formed in a pump casing 51 and integrally includes a centrifugal impeller 61a. The rotor 61 is rotatable about the axis Z and is movable up and down along the axis Z. The rotor 61 has a permanent magnet 62a provided on its upper surface and a permanent magnet 62b on its lower surface. A desk type upper stator 63 is disposed above the permanent magnet 62a, and a desk type lower stator 64 is disposed below the permanent magnet 62a. An upper axial direction control / rotation control coil 65 and an upper tilt control coil 66 are provided on the salient poles of the upper stator 63. Above the lower stator 64 lower axial control and rotation control coil 67 and the lower slope control coil 68 is provided.

  Upper stator 62 of axial type magnetic levitation centrifugal pump P, upper axial direction control / rotation control coil 65, upper tilt control coil 66 and lower stator 64, lower axial direction control / rotation control coil 67, and lower tilt control coil 68 are arranged to face each other and are arranged symmetrically with respect to the axis X of the rotor 61.

  In the axial type magnetic levitation centrifugal pump P configured as described above, the rotor 61 has an upper axial direction control / rotation control coil 65 and a lower axial direction control / rotation control coil 67 of the upper stator 62 and the lower stator 63, respectively. Accordingly, the impeller 61a of the rotor 61 is rotated in a magnetically levitated state, whereby the pump feed fluid (for example, blood) that flows into the pump chamber 52 from the suction port 53 is subjected to a centrifugal action, and the discharge port 54 It is fed to the outside and the pump operation is performed.

  The above-described axial type magnetic levitation centrifugal pump P is driven to rotate in a non-contact state that does not require a bearing for rotating and supporting the rotor 61. Therefore, contamination of discharged liquid due to lubricating grease or contamination of wear due to mechanical contact is prevented. Since there is no fear, it is suitable for feeding high-purity liquid.

In the above-described embodiment of the axial type magnetic levitation motor, the two-pole axial type magnetic levitation motor has been described. However, the present invention is not limited to this. Moreover, although the neodymium-type magnet and the samarium-type magnet were employ | adopted as the permanent magnet used for a motor, it is not limited to this. In addition, the arrangement of the rotor axial position / rotation control coil and the rotor tilt control coil is not limited to the configuration of the axial magnetic levitation motor of the embodiment, and in the axial magnetic levitation motor, the axial position / rotation control is performed. The coil for inclination may be arranged on the base side of the salient pole of the stator and the coil for tilt control may be arranged on the tip side of the salient pole. Further, the axial position / rotation control coil and the tilt control coil may be arranged by mixing both the coils with the salient pole of the stator.

  For example, in the case of an axial-type magnetically levitated 4-pole motor, a tilt control coil may be arranged in addition to the axial position / rotation control coil only on one side of the stator with a tilt control magnetic field as a six-pole rotating magnetic field. Good. In this case, the other stator is not provided with a tilt control coil, and only the axial position / rotation control coil is disposed. It is also possible to obtain an axial type magnetic levitation centrifugal pump provided with an impeller in the rotor portion of the axial type magnetic levitation motor having such a structure.

  Further, for example, as an axial type magnetic levitation 4-pole motor, a tilt control magnetic field is used as a 6-pole rotating magnetic field, one stator structure is adopted on one side, and a tilt control coil is arranged on one stator on one side. Also good. Then, an attractive force generator such as an electromagnet or a permanent magnet that can be substituted as a magnetic attractive force generator by a magnetic field or the like may be installed on one side of the stator that faces the rotor. This suction force generator can be substituted by gravity. It is also possible to obtain an axial type magnetic levitation centrifugal pump provided with an impeller in the rotor portion of the axial type magnetic levitation motor having such a structure.

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Upper stator, 3 ... Lower stator, 4 ... Axial position / rotation control coil, 5 ... Tilt control coil, 6 ... Tilt control coil, 7 ... Axial position / rotation control coil, DESCRIPTION OF SYMBOLS 8 ... Rotor yoke, 9 ... Impeller, 10 ... Permanent magnet, 21 ... Overcurrent sensor, 22 ... A / D capacitor | condenser, 23 ... Control part, 23a ... Axial position control means, 23b ... Rotation control means, 23c ... Inclination control means , 24 ... power source, 25 ... amplifier (amplifier), 31 ... rotor, 32a1 ... permanent magnet, 32a2 ... permanent magnet, 34 ... stator, 34a ... salient pole, 35 ... coil for axial position / rotation control, 36 ... tilt control Coil 41. Rotor 42 a 1 Permanent magnet 42 a 2 Permanent magnet 44 Stator 44 a Salient pole 46 Tilt control coil 47 Axis position / rotation control coil 51 Pump casing, 52 ... pump chamber, 53 ... suction port, 54 ... discharge port, 61 ... rotor, 61a ... impeller, 62a ... permanent magnet, 62b ... permanent magnet, 63 ... upper stator, 64 ... lower stator, 65 ... upper shaft Directional position / rotation control coil, 66: Upper tilt control coil, 67: Lower axial position / rotation control coil, 68: Lower tilt control coil, A: Axial magnetic levitation motor, A1: Axial magnetic levitation Motor, A2 ... Axial type magnetic levitation motor, P ... Axial type magnetic levitation centrifugal pump.

Claims (19)

  A rotor, a salient pole projecting and extending toward the rotor side, an upper stator spaced apart from the rotor along the axial direction of the rotor, and a salient pole projecting and extending toward the rotor side A lower stator spaced apart from the lower portion of the rotor along the axial direction of the rotor, and balancing the magnetic attraction generated by the upper stator and the lower stator so that the rotor is moved in the axial direction. In the axial type magnetic levitation motor that is rotated in a non-contact state around the axis of the rotor while being axially magnetically levitated along, an upper permanent magnet is provided on the upper surface in the axial direction of the rotor, and a lower surface is disposed on the lower surface in the axial direction of the rotor. An upper axial position / rotation control coil for controlling the axial position and rotation of the rotor, and tilt control of the rotor An upper inclination control coil is provided around the salient pole of the upper stator, and a lower axial position / rotation control coil for controlling the axial position and rotation of the rotor and a lower inclination for controlling the inclination of the rotor. A control coil is wound around the salient pole of the lower stator, and the upper axial position / rotation control coil, the upper tilt control coil, the lower axial position / rotation control coil, and the lower tilt control are provided. The axial type magnetic levitation motor is characterized in that the coils are symmetrically arranged along the axial direction of the rotor.   2. The axial magnetic levitation motor according to claim 1, wherein the rotor is provided with an impeller.   2. The axial type magnetic levitation motor according to claim 1, wherein the upper axial position / rotation control coil is wound around a base portion of the salient pole of the upper stator, and the upper tilt control coil is provided by the projection of the upper stator. The lower inclination control coil is wound around the tip of the salient pole of the lower stator, and the lower axial position / rotation control coil is wound on the lower stator. An axial maglev motor characterized by being wound around the base of a pole.   4. The axial type magnetic levitation motor according to claim 3, wherein the rotor is provided with an impeller.   2. The axial type magnetic levitation motor according to claim 1, wherein the upper tilt control coil is wound around the tip of the salient pole of the upper stator, and the upper axial position / rotation control coil is the salient of the upper stator. The lower tilt control coil is wound around the base of the salient pole of the lower stator, and the lower axial position / rotation control coil is wound on the lower stator. An axial type magnetic levitation motor characterized by being wound around the tip of a pole.   6. The axial magnetic levitation motor according to claim 5, wherein the rotor is provided with an impeller.   2. The axial type magnetic levitation motor according to claim 1, wherein the upper tilt control coil and the upper axial position / rotation control coil are provided by being mixed and wound around the salient poles of the upper stator, and the lower tilt control coil. And an axial type magnetic levitation motor, wherein the lower axial direction position / rotation control coil is provided by being mixed and wound around the salient pole of the lower stator.   8. The axial magnetic levitation motor according to claim 7, wherein the rotor is provided with an impeller.   A rotor, a salient pole that protrudes and extends toward the rotor side, an upper stator that is spaced apart from the upper portion of the rotor along the axial direction of the rotor, and a salient pole that protrudes and extends toward the rotor side; A lower stator spaced apart from the lower portion of the rotor along the axial direction of the rotor, and balancing the magnetic attraction generated by the upper stator and the lower stator, thereby moving the rotor along the axial direction; In the axial type magnetic levitation motor that rotates in a non-contact state around the axis of the rotor while being axially levitated, an upper permanent magnet is provided on the upper surface in the axial direction of the rotor, and a lower permanent magnet is provided on the lower surface in the axial direction of the rotor. A magnet is provided, and an upper axial position / rotation control coil for controlling the axial position and rotation of the rotor is connected to the protrusion of the upper stator. A lower axial position / rotation control coil for controlling the axial position and rotation of the rotor is wound around the salient pole of the lower stator, and the salient pole and lower part of the upper stator are provided. An axial magnetic levitation motor, wherein a tilt control coil for controlling the tilt of the rotor is wound around only one of the salient poles of the stator.   The axial type magnetic levitation motor according to claim 9, wherein the rotor is provided with an impeller.   A rotor, a salient pole that protrudes and extends toward the rotor side, a stator that is spaced apart from the rotor along the axial direction of the rotor, and a suction that is spaced apart from the rotor along the axial direction of the rotor Non-contact state around the axis of the rotor while the rotor is axially magnetically levitated along the axial direction by balancing the magnetic attractive force generated by the stator and the attractive force generator. In the axial type magnetic levitation motor that is rotated by the motor, an upper permanent magnet is provided on the upper surface in the axial direction of the rotor, and the axial position / rotation control coil for controlling the axial position and rotation of the rotor and the tilt control of the rotor are provided. A coil for tilt control is wound around the salient pole of the stator, and the attractive force generator generates an attractive force by a static magnetic field. Axial magnetic levitation motor according to claim Rukoto.   11. The axial type magnetic levitation motor according to claim 10, wherein the attraction force generator is provided with a lower permanent magnet on the lower surface in the axial direction of the rotor, and a magnetic material is spaced apart, and a magnetic material is formed on the lower surface in the axial direction of the rotor. An axial type magnetic levitation motor characterized by adopting any one of pasting a material and arranging an electromagnet or a permanent magnet apart and utilizing gravity applied to the rotor.   12. The axial type magnetic levitation motor according to claim 11, wherein the rotor is provided with an impeller.   A rotor including a housing and a pump chamber formed in the housing, the rotor having an impeller disposed in the pump chamber, a salient pole that protrudes and extends toward the rotor side, and the rotor along the axial direction of the rotor An upper stator that is spaced apart from the upper portion of the rotor, and a lower stator that has a salient pole that projects and extends toward the rotor side, and is spaced apart from the lower portion of the rotor along the axial direction of the rotor, An axial type magnetic levitation motor that rotates in a non-contact state around the axis of the rotor while causing the rotor to axially levitate along the axial direction by balancing magnetic attraction generated by the lower stator. In the axial type magnetic levitation centrifugal pump, an upper permanent magnet is provided on the upper surface in the axial direction of the rotor, A lower permanent magnet is provided on an axial lower surface of the upper stator, and an upper axial position / rotation control coil for controlling the axial position and rotation of the rotor, and an upper tilt control coil for controlling the tilt of the rotor are provided in the upper stator. A lower axial position / rotation control coil for controlling the axial position and rotation of the rotor, and a lower inclination control coil for controlling the inclination of the rotor. The upper axial position / rotation control coil and the upper tilt control coil, the lower axial position / rotation control coil, and the lower tilt control coil are arranged in the axial direction of the rotor. An axial type magnetic levitation centrifugal pump provided with an axial type magnetic levitation motor, characterized by being arranged symmetrically along the axis.   An axial type magnetic levitation centrifugal pump characterized in that the axial type magnetic levitation motor defined in claim 4 is used.   An axial type magnetic levitation centrifugal pump using the axial type magnetic levitation motor defined in claim 6.   An axial type magnetic levitation centrifugal pump characterized by using the axial type magnetic levitation motor defined in claim 8.   11. An axial type magnetic levitation centrifugal pump using the axial type magnetic levitation motor defined in claim 10.   14. An axial type magnetic levitation centrifugal pump using the axial type magnetic levitation motor defined in claim 13.

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