JP5548046B2 - Permanent magnet rotating electric machine - Google Patents

Description

The present invention relates to a permanent magnet rotating electrical machine.

A permanent magnet rotating electrical machine in which permanent magnets are arranged in Halbach is a main magnetic pole magnet in which N poles and S poles are alternately arranged in the radial direction, and magnetized in a direction other than the radial direction (for example, in the circumferential direction) on both circumferential sides of the main magnetic pole magnet. (For example, refer to Patent Documents 1 and 2).

The main magnetic pole magnet and the auxiliary magnet of the permanent magnet rotating electrical machine in which the permanent magnets are arranged in the Halbach array are substantially cylindrical as a whole. When the permanent magnets are arranged in the Halbach array, the magnetic force in a specific direction can be increased. The rotating electrical machine having the permanent magnets arranged in the Halbach arrangement can achieve high output without increasing the size. The armature winding 4 is wound around the yoke core 15, and a magnetic flux is formed between the permanent magnet 16, the armature winding 4, and the yoke core 15.

However, in the thing of patent document 1, since the iron core is used for a stator or a rotor, the pulsation of a torque becomes large. Further, since the iron core is used for the stator and the rotor, magnetic saturation of the iron core occurs, and there is a limit to the improvement in torque even if a magnet that generates a strong magnetic field is used.

Therefore, the one devised in view of them is that of Patent Document 2. The permanent magnets arranged in the Halbach array are arranged in two rows, and armature windings are provided between the permanent magnet rows.

JP 2006-320109 A JP 2009-201343 A

However, the permanent magnet rotating electric machine of Patent Document 2 has the following problems to be solved. That is, in a permanent magnet rotating electrical machine having inner and outer two rows of so-called Halbach arrayed permanent magnets, there is a useless space in the inner part of the inner magnet, which becomes a barrier to downsizing the rotating electrical machine. Yes. In addition, a control device such as an inverter or a current amplifier that supplies a current for driving the rotating electrical machine requires a cooling device for cooling heat generated by the loss inside the element. Since it occupies 10 to 60% of the volume, the control device is enlarged. Furthermore, since the cooling device has a drive unit such as a cooling fan, there are problems such as troubles such as maintenance and overheating of the element when the cooling device fails.

The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the volume of the rotating electrical machine and the control device, and to cool the control device using forced cooling of the rotating electrical machine. Accordingly, an object of the present invention is to provide a permanent magnet rotating electrical machine capable of improving reliability.

In order to solve the above, the permanent magnet rotating electric machine according to the embodiment includes an armature winding, a stator in which the armature winding is hollow, and a rotor that is rotatably supported with respect to the stator. Two permanent magnet rows arranged in a Halbach array , one permanent magnet row being provided outside the armature winding, and the other permanent magnet row being provided inside the armature winding. The direction of the magnetic poles of the outer permanent magnets of the permanent magnet array and the direction of the magnetic poles of the inner permanent magnets of the permanent magnet array are the same for the radial magnetic poles and the opposite for the circumferential magnetic poles. A rotor, a control device for supplying a drive current to the armature winding, and a rotor disposed on the inner side of the inner permanent magnet row. And a frame hole .

  ADVANTAGE OF THE INVENTION According to this invention, the permanent magnet rotary electric machine which can reduce the volume of a rotary electric machine and a control apparatus, and can improve reliability by cooling a control apparatus using forced cooling of a rotary electric machine. Can provide.

Sectional drawing explaining the structure of 1st Embodiment (axial direction). Sectional drawing (diameter direction) explaining the structure of 1st Embodiment. Sectional drawing explaining the structure of 2nd Embodiment (axial direction). The top view (diameter direction) explaining the structure of 2nd Embodiment. Sectional drawing explaining the structure of 3rd Embodiment (axial direction). Top view for explaining the configuration of the third embodiment (radial direction) Sectional drawing explaining the structure of 4th Embodiment (axial direction). Sectional drawing (diameter direction) explaining the structure of 4th Embodiment. Sectional drawing explaining the structure of 5th Embodiment (axial direction). Sectional drawing (diameter direction) explaining the structure of 5th Embodiment.

Hereinafter, an embodiment of a rotating electrical machine having a permanent magnet according to the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration will be described. FIG. 1 is an axial cross section of a permanent magnet rotating electrical machine 1 according to a first embodiment of the present invention. An armature winding 4 is attached to the stator 6. For example, when using a three-phase alternating current, the armature winding 4 is wound in the order of U phase-V phase-W phase. A bearing 9 is formed in an arc shape between the stator 6 and the rotor 5, and the rotor 5 is configured to rotate on the stator 6. The rotor 5 includes two rows (2, 3) of substantially cylindrical permanent magnet rows configured in a Halbach array in the circumferential direction. The rotor 5 has two rows of convex portions on the side facing the stator, the permanent magnet row (outside) 2 is formed on the outer convex portion of the rotor, and the permanent magnet row (on the inner convex portion). The inner side 3 is attached by bonding or the like, for example. The armature winding 4 is arranged between the permanent magnet rows 2 and 3 attached to the rotor. Further, a control device 7 such as an inverter is arranged in a space surrounded by the rotor and the stator. The control device 7 includes heat radiating fins 71, and heat generated in the control device 7 can be released to the outside. FIG. 2 shows a cross section (radial direction) of the rotating electrical machine 1 in the first embodiment. The permanent magnet rows 2 and 3 attached to the rotor have an arrangement of magnetic poles as shown in FIG. That is, the magnetic poles magnetized in the radial direction are configured such that the magnetic poles of the permanent magnets in the outer permanent magnet row 2 and the inner permanent magnet row 3 are in the same direction. The permanent magnets magnetized in the circumferential direction between the magnetic poles magnetized in the radial direction are configured such that the magnetic poles of the outer permanent magnet row 2 and the inner permanent magnet row 3 are in opposite directions.

  Next, the effect will be described. In the rotating electrical machine 1, the rotor 5 rotates by passing, for example, a three-phase alternating current through the armature winding 4. Since the three-phase alternating current is supplied by the control device 7, an external control device that is normally required is unnecessary, and the size can be reduced.

(Second Embodiment)
First, the configuration will be described. FIG. 3 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the second embodiment. FIG. 4 is a top view of the permanent magnet rotating electrical machine 1 according to the second embodiment.

Since the basic configuration is the same as that of the first embodiment, a description thereof will be omitted.

  A feature of the second embodiment is that a frame hole 13 is provided in the rotor 5 at a position corresponding to an element such as an IGBT of the control device 7.

  Next, the operation will be described. When the rotor 5 provided with the frame hole 13 rotates, it acts as a fan through which air fluid flows. The air inside the permanent magnet rotating electrical machine 1 is exchanged with outside air through the frame hole 13.

  Next, the effect will be described. According to the second embodiment, an element such as IGBT of the control device 7 has a current flowing inside the element in order to supply current to the armature winding 4, but a loss occurs and heat is generated when the current flows. . By replacing the air inside the permanent magnet rotating electrical machine 1 with the outside air through the frame hole 13, the heat generated by the loss of the control device 7 can be cooled.

(Third embodiment)
First, the configuration will be described. FIG. 5 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the third embodiment. FIG. 6 is a top view of the permanent magnet rotating electrical machine 1 according to the third embodiment.

Since the basic configuration is the same as that of the first embodiment, a description thereof will be omitted.

  The feature of the third embodiment is that a frame hole 14 with an inclined surface is installed at a position corresponding to the control device 7.

  Next, functions and effects will be described. When the rotor 5 provided with the inclined frame hole 14 rotates, air easily flows in from the frame hole 14 having the shape shown in FIG. 5 by centrifugal force. Therefore, the cooling effect with respect to the control apparatus 7 which is a heat generating body increases.

(Fourth embodiment)
First, the configuration will be described. FIG. 7 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the fourth embodiment. FIG. 8 is a top view of the permanent magnet rotating electrical machine 1 according to the fourth embodiment.

Since the basic configuration is the same as that of the first embodiment, a description thereof will be omitted.

  A circular frame hole is formed around the rotation axis of the rotor 5, and a plurality of blades are provided on the inner peripheral wall surface of the frame hole. A stator frame hole 16 is provided around the rotation axis center of the stator 6. The control device 7 is arranged in a circular shape corresponding to the stator frame hole 16, and radiating fins 72 are arranged inside thereof.

  Next, functions and effects will be described. The wings 15 provided on the rotor 5 serve as a fan by the rotation of the rotor 5 and generate a flow of air fluid. Air is taken into the permanent magnet rotating electrical machine 1, takes heat generated by the control device 7 from the heat radiation fins 72 provided in the control device 7, and is discharged to the outside through the stator frame hole 16. Thereby, the control apparatus 7 can be cooled efficiently.

(Fifth embodiment)
First, the configuration will be described. FIG. 9 is an axial sectional view of the permanent magnet rotating electrical machine 1 according to the fifth embodiment. FIG. 10 is a radial cross-sectional view of the permanent magnet rotating electrical machine 1 according to the fifth embodiment. Since the basic configuration is the same as that of the fourth embodiment, a description thereof will be omitted.

  In the fifth embodiment, radial stator radiating fins 17 are provided on the lower surface of the stator 6 from the stator frame hole 16 to the end portion, and radiating fin oil 18 such as a plate is provided to cover the stator radiating fins. It is a thing.

  Next, functions and effects will be described. The wings 15 provided on the rotor 5 serve as a fan by the rotation of the rotor 5 and generate a flow of air fluid. Air is taken into the permanent magnet rotating electrical machine 1, takes heat generated by the control device 7 from the radiating fins 72 provided in the control device 7, and is surrounded by the protrusion 17 and the protrusion oil 18 through the stator frame hole 16. Move to the designated space. Heat generated in the armature winding 4 that is a heating element is transmitted to the stator radiating fins 17 through the stator 6, and is discharged to the outside by the air flow generated by the blades 15. Thereby, not only the control apparatus 7 but the armature winding 4 can be efficiently cooled.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 2 ... Permanent magnet (outside)
3 Permanent magnet (inside)
4 ... Armature winding,
DESCRIPTION OF SYMBOLS 5 ... Rotor 6 ... Stator 7 ... Control apparatus 71 ... Radiation fin 72 ... Radiation fin 8 ... Coil connecting wire 9 ... Bearing 10 ... U-phase winding 11 ... V-phase winding 12 ... W-phase winding 13 ... Frame hole 14 ... Inclined frame hole 15 ... Wings 16 ... Stator frame hole 17 ... Stator radiating fin 18 ... Radiating fin oi

Claims (4)

A stator having an armature winding, and the inside of the armature winding being hollow;
The permanent magnet has two rows of permanent magnets rotatably supported with respect to the stator and arranged in a Halbach array in the circumferential direction . One permanent magnet row is provided outside the armature winding, and the other permanent magnet A row is provided inside the armature winding, and the permanent magnet row is configured such that the direction of the magnetic pole of the outer permanent magnet of the permanent magnet row and the direction of the magnetic pole of the inner permanent magnet of the permanent magnet row are radial. The rotor is oriented in the same direction for the direction of the magnetic poles and in the opposite direction for the direction of the magnetic poles in the circumferential direction
A control device that is disposed on a stator inside the permanent magnet row inside the rotor and supplies a drive current to the armature winding;
A frame hole provided inside the inner permanent magnet row in the rotor;
Permanent magnet rotating electric machine characterized in that it comprises a. The permanent magnet rotating electrical machine according to claim 1, wherein the frame hole is provided at a position corresponding to the control device. 3. The permanent magnet rotating electrical machine according to claim 1, wherein the frame hole is a long hole provided in a substantially arc shape and has an inclined surface along a rotation axis. The permanent magnet rotating electrical machine according to any one of claims 1 to 3, wherein a frame hole is provided in the center portion of the stator, and substantially radial radiating fins are provided from the frame hole toward the outer peripheral end portion of the stator. A permanent magnet rotating electrical machine comprising a cover for covering a fin.