JPH0557816B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a rotating electric machine, and particularly to a high-output rotating field type synchronous generator.

[Background technology]

In a rotating field type synchronous generator, slots are opened inside the cylindrical stator, coils are fitted into these slots, and the field rotates inside the coil. At this time, the magnetic poles N and S of the stator are at positions delayed in the rotational direction from the field poles N and S of the rotor, and the field rotates against the holding torque due to the attractive force of the stator magnetic poles. This absorbs power and generates electricity. This holding torque increases according to the capacity of the generator, and therefore, a large driving torque is required to overcome this holding torque. Therefore, in order to reduce this holding torque, it has been proposed to attach a permanent magnet coaxially with the rotor in a bicycle magnetic generator, and to arrange a fixed magnet opposite to this permanent magnet. In this structure, N magnetic poles and S magnetic poles are formed alternately in the circumferential direction of the permanent magnet for power generation of the rotor, so that the N and S magnetic poles of this permanent magnet correspond to the S and N magnetic poles of the fixed magnet for repulsion. There was a drawback that the holding torque could not be effectively lowered due to mutual attraction.

[Purpose of the invention]

An object of the present invention is to provide a brushless synchronous generator that is particularly suitable for high output, has a simple structure, high reliability, and can effectively reduce holding torque.

[Disclosure of the invention]

In this invention, a generator is composed of a power generation section and a torque balancer section, and the power generation section has a main field structure supported by a stator, and a periodic power generator that opposes the main field structure with an air gap therebetween. It is characterized by consisting of a rotor equipped with magnetic pole parts that produce magnetic flux changes, and an output winding that responds to magnetic flux changes. The torque balancer section includes a torque balancer field structure and balancer magnetic poles facing the torque balancer field structure with an air gap, and is supported on the rotor so that the balancer magnetic poles are in the same phase as the magnetic pole section. be done. A magnetic shielding member is disposed between the main field structure and the balancer field structure to reduce mutual magnetic influence.
With this structure, the attraction and attraction force from the main field structure and the repulsion force from the balancer field structure act on the rotor efficiently at the same time, thereby balancing the attraction and repulsion forces with each other to hold the rotor. Torque will be significantly reduced.

〔Example〕

Next, an embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a partial cross-sectional perspective view of the specific structure of a four-pole generator as a preferred embodiment of the brushless synchronous generator according to the present invention. Unnecessary or redundant structural parts have been omitted.

In FIG. 1, a power generation section 10a of a brushless synchronous generator 10 includes a stator 14, which is concentrically supported within a cylindrical housing 12 made of a non-magnetic material.
A stator 17 consisting of 16 pieces is provided. Stator 14
is made of a magnetic material with high magnetic permeability, and the stator 1
6 is made of a non-magnetic material.

The stator 14 has first and second field poles 18, 2 that are spaced apart in the axial direction and constitute a main field structure.
0 is fixedly supported. The first field pole includes a plurality of field poles 18a, 18'a, 18 extending radially inward.
b, 18'b (see Figure 3). Similarly, the second field pole 20 includes a plurality of field poles 20a, 20'a,
20b and 20'b. The field magnetic poles of the first field pole 18 and the field magnetic poles of the second field pole are fixed within the stator 14 so as to be aligned in the axial direction,
The field magnetic poles 18a and 18b are arranged so as to be opposite magnetic poles, that is, an N pole and an S pole. The field magnetic pole 18b is arranged at a position 180 degrees out of phase in electrical angle with respect to the field magnetic pole 18a, and the field magnetic pole 20b, which opposes this field magnetic pole in the axial direction, is set to the north pole. The field magnetic pole 18'a has the same north pole as the radially opposing field magnetic pole 18a, and the field magnetic pole 18'b has the same north pole as the radially opposing field magnetic pole 1.
It has the same south pole as 8b. In this way, the field magnetic pole 1
8a, 18b, 18'a, 18'b are N, S, N,
The field magnetic poles which have an S pole and are axially opposed to these field magnetic poles have S, N, S, and N poles, respectively, so that their polarities are opposite to each other.

As is clear from FIGS. 1, 2 and 3, field poles 18a, 18b, 18'a, 1 of the first field pole 18
8′b each has a DC field winding 18 for excitation.
aw, 18bw, 18'aw, 18'bw are supported,
These are excited by a DC exciting current (not shown). Similarly, the field magnetic pole of the second field pole 20 also supports DC field windings 20aw, 20'aw, and 20bw for excitation, and is excited by the DC excitation current.

In FIGS. 1 and 2, a trochoidal output winding 22 is fixedly supported within the stator 14 by suitable means between the first and second field poles 18 and 20 so as to surround the rotor 24. The rotor 24 includes a rotating shaft 26, which is rotatably supported via end housings and bearings (not shown) provided on both sides of the stator 17. The rotating shaft 26 is connected to an electric motor or other suitable drive source and is rotationally driven.

The torque balancer section 10b includes a balancer field pole, and the balancer field pole includes a third field pole 28 fixed to the stator 16 and spaced from the first field pole 18 in the axial direction. In FIGS. 1, 2, and 4, the third field pole 28 has four field poles 28a, 28b,
28'a and 28'b. Field magnetic pole 28a, 2
8b, 28'a, 28'b are field windings 28, respectively.
aw, 28bw, 28'aw, and 28'bw, and an exciting current is supplied to these DC field windings.

The field magnetic poles of the first and second field poles 18 and 20 have N poles and S poles arranged alternately every 180 degrees in electrical angle, whereas the field magnetic poles of the third field pole 28 are all The magnetic pole is set to either the north pole or the south pole.
In FIGS. 2 and 4, it is shown as being set to the north pole.

Returning again to FIGS. 1, 2, and 4, the rotor 24 includes a non-magnetic section portion 24a made of stainless steel or other low magnetic permeability material, and a pair of magnetic pole portions 30 fixed to the non-magnetic section portion 24 and extending in the axial direction. ,3
0'. The magnetic pole parts 30, 30' face the first and second field poles of the main field structure with air gaps A, A' interposed therebetween, and cause periodic magnetic flux changes in the axial direction. The torque balancer 10b includes balancer magnetic poles 32 and 32' that oppose the balancer field structure field pole 28 with an air gap A'' in between.Balancer magnetic pole 3
2 and 32' are supported by the rotor 24 at positions that are synchronized with the magnetic pole parts 30 and 30'. The magnetic pole parts 30, 30' are constructed of a stack of a plurality of laminate materials with high magnetic permeability, such as silicon steel plates, and are formed by radially opening axial grooves formed in the non-magnetic section 24a of the rotor 24. 24b, 24'b and fixed within the grooves 24b, 24'b by screws, brazing or other suitable means. 1st,
As is clear from FIG. 2, both ends of the magnetic pole member 30 are connected to the field magnetic poles 18 of the first and second field poles 18 and 20.
a, 20a, and similarly the magnetic pole member 3
Both ends of 0' are arranged directly below the field magnetic poles 18'a, 20'a of the first and second field poles 18, 20, and the magnetic pole members 30, 30' are arranged to direct the magnetic flux between the first and second field poles. cyclically changes in the axial direction.

In FIGS. 1, 2, and 4, the balancer magnetic poles 32 are made of permanent magnets, for example, and are formed in grooves 24 formed at one end of the non-magnetic section 24a of the rotor 24.
c with adhesive or other suitable means. The balancer magnetic pole 32 and the magnetic pole members 30, 30' are a shoulder portion 24d that acts as a spacer portion.
are separated from each other so that there is no magnetic influence.
The balancer pole 32 is positioned in phase with the pole members 30, 30' for purposes described in detail below.

As is clear from FIGS. 1 and 2, a magnetic shielding member 29 is disposed between the main field structure and the balancer field structure, and is fixed inside the stator by screws or other suitable means. The magnetic shielding member 29 is made of a material with high magnetic permeability, such as a stack of silicon steel plates, and has a hole 29a surrounding the rotor 24 and a ventilation hole 29b, as shown in FIG. It has the role of shielding so that the influence of the magnetism generated by the first field pole 18 does not affect the magnetism of the balancer field pole 28.

In the position shown in FIGS. 1 to 4, the magnetic pole member 3
0 is located directly below the field magnetic poles 18a, 20a, and the magnetic pole member 30' is located directly below the field magnetic poles 18'a, 20'a. In this way, in FIGS. 1 to 3, a magnetic flux circuit is formed between the two N-pole field magnetic poles on the left and the two S-pole field magnetic poles on the right. The magnetic flux flows from the N-pole field magnetic poles 18a, 18'a to the magnetic pole members 30, 3.
0' to the S-pole field magnetic poles 20a, 20'a, and further flows to the N-pole field magnetic pole 1 via the stator 14.
Return to 8a, 18'a. At this time, the magnetic flux interlinks with the output winding 22, so a current flows through the output winding 22.

Next, returning to FIGS. 1 and 3, the rotor 24 is
When the rotor 24 rotates clockwise from the position shown in the figure, the magnetic flux decreases, and the rotor 24 rotates clockwise in Figures 3 and 4.
When rotated through 90 degrees, or 180 degrees electrically, the magnetic flux flows in the opposite direction relative to the output winding 22. At this time, the magnetic flux flows from the N-pole field magnetic pole on the right side of FIG. 1 to the S-pole field magnetic poles 18b, 18'b on the left side, and flows through the stator 14 to the N-pole field magnetic pole on the right side.
In this way, current flows in the output winding 22 in the opposite direction. When the rotor 24 is rotated continuously, changes in magnetic flux are repeated alternately in two directions, and an alternating current is generated in the output winding 22.

〔effect〕

As described above, according to the present invention, since the rotor is equipped with a magnetic pole member made of a highly permeable material and this magnetic pole member is opposed to the field pole of the power generation section through an air gap, the balancer field pole relative to this magnetic pole member is In addition, by placing a magnetic shielding member between the power generation section and the torque balancer section, mutual magnetic interference between the power generation section and the torque balancer section is prevented, making it suitable for high output applications. It is possible to provide a brushless synchronous generator that is suitable, has a simple structure, is highly reliable, can effectively reduce holding torque, and has extremely great industrial value. Furthermore, although it was impossible to increase the speed with the conventional type, in the present invention, the rotor is completely solid and brushless, so there is no restriction on increasing the speed. Moreover, in the case of conventional large-scale generators, the collectors and brushes for passing large currents are extremely large, which is not only extremely uneconomical, but also results in poor efficiency and reduced reliability, which makes them difficult to use over a long period of time. However, the present invention has the remarkable effect of solving all of these problems.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view of a generator according to an embodiment of the present invention, FIG. 2 is a cross-sectional view from FIG. 1, FIG. 3 is a cross-sectional view from FIG. 2, and FIG. 2 and 5 respectively show the magnetic shielding member. 14, 16... Stator, 18, 20, 28... First, second, third field poles, 24... Rotor, 22... Output winding, 29... Magnetic shielding member.

Claims (1)

[Claims] 1. A stator, a main field structure supported by the stator, and a rotor including a magnetic pole part that faces the main field structure across an air gap and causes periodic changes in magnetic flux; The power generation unit includes an output winding supported by the stator and responsive to the magnetic flux change, and a torque balancer unit connected to the power generation unit, the torque balancer unit having a torque balancer field structure; balancer magnetic poles facing the torque balancer field structure through an air gap; the balancer magnetic poles are fixed to the rotor so as to be in phase with the magnetic pole portion; A brushless synchronous generator characterized in that a magnetic shielding member is disposed between the torque balancer field structure and the torque balancer field structure.