JP2530940Y2 - Permanent magnet type rotor of rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rotor having a permanent magnet that forms a field of a rotating electric machine.

2. Description of the Related Art Conventionally, when a permanent magnet is provided on a rotor of a rotating electric machine to form a field, as a first example, the permanent magnets are arranged at regular intervals in the circumferential direction of the outer periphery of the rotor. Japanese Patent Application Laid-Open No. 58-11983 discloses a method in which the same number of permanent magnets are provided, and the magnetic pole faces of the permanent magnets are magnetized so that the magnetic poles face each other alternately in the radial direction.

As a second example, the same number of permanent magnets as the number of magnetic poles of the rotating electric machine are radially provided on the outer periphery of the rotating shaft via a non-magnetic cylinder, and a yoke is provided between the permanent magnets. The yoke is magnetized from the tangential direction of the circumference so that the surfaces of the two permanent magnets in contact with the yoke have the same polarity. In this way, the magnetic flux of the tangential permanent magnet is received from both side surfaces of the yoke, and all of the magnetic flux is passed through the outer peripheral surface of the yoke, so that the outer peripheral surface alternately has a different polarity in the circumferential direction. One having a magnetic pole surface is disclosed (for example, Japanese Patent Application Laid-Open No. 58-139665).

Further, in order to increase the magnetic flux emitted from the outer peripheral surface of the yoke, an auxiliary permanent magnet magnetized in the radial direction is added between the yoke and the rotating shaft (Japanese Patent Application Laid-Open No. 48-48948). -30003
No.).

[Problem to be Solved by the Invention] By the way, according to the configuration of the second example, the magnetic flux coming out of the magnetic pole faces of the two permanent magnets sandwiching the yoke is included in one magnetic pole face. In this case, the magnetic flux can be concentrated more than when the magnetic flux exits from one of the pole faces of the permanent magnet of the example, so that the magnetic flux density on the pole face becomes higher.

However, since the permanent magnet is magnetized in the radial direction, it is necessary to increase the radial length of the permanent magnet in order to increase the magnetic flux density, but increase the radial length of the permanent magnet This means that the entire rotating electric machine becomes large.
Therefore, there is a limitation that there is a limit in increasing the generated magnetic flux density by increasing the radial length of the permanent magnet.

An object of the present invention is to increase the magnetic load of a rotating electric machine without increasing the diameter of a rotor.

[Means for Solving the Problems] The present invention provides a non-magnetic cylinder fixed to the outer periphery of a rotating shaft, and a non-magnetic cylinder radially provided on the outer periphery of the non-magnetic cylinder and having a tangential polarity alternately different in a circumferential direction. A plurality of main permanent magnets arranged at equal intervals, a plurality of yoke provided between the main permanent magnets in a circumferential direction, and a plurality of auxiliary permanent magnets fixed to both axial end surfaces of the yoke. In the permanent magnet rotor of a rotating electric machine comprising a magnet, the auxiliary permanent magnet has a magnetic pole surface in contact with the yoke of the auxiliary permanent magnet having the same polarity as a polarity of a magnetic pole surface of the main permanent magnet in contact with the yoke. And a disk-shaped side plate made of a magnetic material connecting all adjacent auxiliary permanent magnets is fixed to both end surfaces in the axial direction of the auxiliary permanent magnet. .

Further, a concave portion having substantially the same shape as the magnetic pole surface of the auxiliary permanent magnet is formed in the side plate, and the auxiliary permanent magnet is fitted into the concave portion.

Further, the outer diameter of the side plate is made larger than the outer diameter of the auxiliary permanent magnet, and the outer diameter side of the auxiliary permanent magnet is fitted to a side surface.

[Operation] In addition to the magnetic flux of the main permanent magnet provided on the tangential side surface of the yoke, the magnetic pole surface formed on the outer peripheral surface of the yoke contacts the axial side surface, that is, the rotating shaft side surface of the yoke. Since the magnetic flux of the auxiliary permanent magnet provided passes through, the magnetic flux density on the pole face increases uniformly as a whole.

The magnetic flux from the main permanent magnet passes through the yoke, travels from the outer surface of the yoke to the stator, passes through the yoke of the stator, enters the next yoke, and contacts the next yoke. Return to main permanent magnet.

Also, the magnetic flux emitted from the auxiliary permanent magnet passes through the yoke that is in contact, travels from the outer peripheral surface of the yoke to the stator, passes through the yoke of the stator, and enters the next yoke, and then the next yoke Enters the auxiliary permanent magnet which is in contact with and returns to the original auxiliary permanent magnet through the side plate.

[Embodiment] An embodiment of the present invention shown in the drawings will be described.

FIG. 1 is a side sectional view of an embodiment of the present invention, in which a rotor 2 is provided through a gap inside a stator 1 of a rotating electric machine, and the rotor 2 is mounted on a rotating shaft 21 via bearings 22 and 23. Brackets 11, 12
It is supported by. The rotor 2 has a main permanent magnet 3 magnetized in a tangential direction radially provided on the outer periphery of a non-magnetic cylinder 24 provided on the outer periphery of the rotating shaft 21 by the same number as the number of magnetic poles of the rotating electric machine. Between the main permanent magnets 3, a yoke 4 whose section perpendicular to the axis is formed substantially in a sector shape is provided, and the yoke 4 of both main permanent magnets 3 sandwiching the tangential side surfaces 41, 41 of the yoke 4. The magnetic pole faces 31 are magnetized so as to have the same polarity. Also,
The fan-shaped auxiliary permanent magnets 5, 5 having the same shape are provided on the axial side faces 42, 42 of the yoke 4, and one of the axial pole faces 51 in the axial direction that is in contact with the yoke 4 is the main permanent magnet that is in contact with the yoke 4. It is magnetized so as to have the same polarity as the magnetic pole surface 31 of the magnet 3. On the other magnetic pole surfaces 52 of the auxiliary permanent magnets 5, 5, a disk-shaped side plate 6 made of a magnetic material is provided. That is, the inner diameter of the side plate 6 is fitted to the non-magnetic cylinder 24 and fixed concentrically to the rotor 2, connected to the auxiliary permanent magnet 5 attached to the side surface of the adjacent yoke 4, and connected to the adjacent auxiliary permanent magnet. A magnetic circuit between the magnets 5 is configured.

As described above, the four side surfaces of the yoke 4 are surrounded by the main permanent magnets 3 and 3 and the auxiliary permanent magnets 5 and 5, and the outer peripheral surface of the yoke 4 is alternately poled alternately in the circumferential direction of the rotor 2. And then
A magnetic pole surface 43 is formed opposite to the stator 1 via a gap.

The main permanent magnet 3 and the auxiliary permanent magnet 5 may be made of different materials. However, if they are made of the same material, the magnetic flux distribution on both axial sides of the yoke 4 becomes uniform, which is advantageous in manufacturing.

When fixing the main permanent magnet 3 and the yoke 4 to the rotor 2,
It is fixed to the rotating shaft 21 with an adhesive or integrally molded with a resin mold. Further, in order to prevent separation due to centrifugal force, a glass tape is wound around the outer peripheral surface of the rotor 2 and impregnated with resin. The fan-shaped auxiliary permanent magnet 5 and the ring-shaped side plate 6 provided on the axial end surface of the rotor are fixed with an adhesive, or through holes are provided in the yoke 4, the auxiliary permanent magnet 5 and the side plate 6, and through bolts 7 are used. Fix it.

As described above, the tangential side surfaces 41, 41 and the axial side surfaces 42, 42 of the yoke 4 are surrounded by the main permanent magnet 3 and the auxiliary permanent magnet 5, and thus are generated by the main permanent magnet 3 and the auxiliary permanent magnet 5. All of the magnetic flux flows through the pole face 43 toward the stator 1 as shown by the broken lines in FIGS. The magnetic flux that has entered the stator 1 passes through the stator yoke, enters the adjacent magnetic pole surface 43 ′, and returns to the main permanent magnet 3 and the auxiliary permanent magnet 5 surrounding the yoke of the magnetic pole surface 43 ′.

Therefore, on the magnetic pole surface formed on the outer peripheral surface of the yoke,
In addition to the magnetic flux of the main permanent magnet provided on the tangential side surface of the conventional yoke, the magnetic flux of the auxiliary permanent magnet provided on the axial side surface passes, so the magnetic flux density on the pole face is extremely large. For example, it is possible to easily increase the magnetic flux density to approximately 1.5 times the conventional size with the same dimensions.

As shown in FIG. 3, a concave portion 61 having substantially the same shape as the sector-shaped magnetic pole surface 52 of the auxiliary permanent magnet 5 is formed in the disk-shaped side plate 6, and the auxiliary permanent magnet 5 is fitted into the concave portion 61. The auxiliary permanent magnet 5 is easily positioned and fixed, and the side plate 6
May be fitted and fixed to the non-magnetic cylinder 24.

Further, as shown in FIGS. 4 (a) and 4 (b), a fixing groove 62 having a concave portion (concave knock) into which the main permanent magnet 3 can be inserted is provided at a position between the auxiliary permanent magnets 5 adjacent to the side plate 6. Alternatively, the side surface of the main permanent magnet 3 may be protruded between the auxiliary permanent magnets 5 and inserted into the fixing groove 62 so that the side plates 6 provided at both ends of the rotor 2 prevent the rotor from jumping out due to centrifugal force.

[Effects of the Invention] As described above, according to the present invention, the magnetic flux density on the magnetic pole surface is increased, and the auxiliary permanent magnet suppresses the leakage magnetic flux in the axial direction, thereby increasing the torque contribution and increasing the motor torque. Therefore, there is an effect that it is possible to provide a small and lightweight rotating electric machine applicable to the fields of aviation and space equipment.

[Brief description of the drawings]

1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a front sectional view, FIG. 3 is a sectional view of a main part showing another embodiment, and FIG. 4 (a) is another embodiment. A shown in FIG. 4 (b)
FIG. 4 (b) is a front sectional view taken along a section A of FIG.
FIG. 4 is a side sectional view taken along the line BB shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Rotor 21 ... Rotating shaft, 24 ... Non-magnetic cylinder 3 ... Main permanent magnet, 31 ... Magnetic pole surface 4 ... Yoke, 41 ... Tangential side surface 42 ... Axial side surface, 43, 43 '... Pole surface 5 ... Auxiliary permanent magnet, 51 ... Pole surface 6 ... Side plate, 61 ... Recess 62 ... Fixed groove

Claims (3)

(57) [Scope of request for utility model registration] 1. A non-magnetic cylinder fixed to the outer periphery of a rotating shaft, and a plurality of non-magnetic cylinders radially provided on the outer periphery of the non-magnetic cylinder and arranged at equal intervals in a circumferential direction so that tangential polarities are alternately different. Main permanent magnet, a plurality of yokes provided between the main permanent magnets in the circumferential direction, and a plurality of auxiliary permanent magnets fixed to both axial end surfaces of the yoke. In the magnet rotor, the auxiliary permanent magnet is attached in the axial direction such that a magnetic pole surface of the auxiliary permanent magnet that contacts the yoke has the same polarity as a magnetic pole surface of the main permanent magnet that contacts the yoke. A permanent magnet type rotor for a rotating electric machine, wherein a disc-shaped side plate made of a magnetic material that connects adjacent auxiliary permanent magnets is fixed to both end faces in the axial direction of the auxiliary permanent magnet. . 2. The permanent magnet type of a rotating electric machine according to claim 1, wherein said side plate has a concave portion having substantially the same shape as the magnetic pole surface of said auxiliary permanent magnet, and said auxiliary permanent magnet is fitted into said concave portion. Rotor. 3. The permanent magnet type of a rotating electric machine according to claim 2, wherein said side plate has an outer diameter larger than an outer diameter of said auxiliary permanent magnet, and an outer diameter side of said auxiliary permanent magnet is fitted to a side surface. Rotor.