JPH0742226Y2 - Permanent magnet field synchronous machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a permanent magnet field type synchronous machine, in particular, a permanent magnet field type with improved characteristics of a synchronous servo motor controlled and operated by a control amplifier. Type synchronous machine.

[Conventional technology]

4 and 5 are views showing a conventional permanent magnet field type synchronous machine. In FIG. 4, 1 is an outer stator and 2 is an outer stator wound around the outer stator 1. A coil, 3 is an inner stator, 4 is an inner stator coil wound around the inner stator 3, 5 is a rotor, 6 is a permanent magnet, 7 is a thin-walled cylindrical rotor yoke, and 8 is the rotor. A bearing that rotatably supports 5; 9 is an end bracket that supports the bearing 8 and the inner stator 3; 10 is the end bracket 9;
A frame supporting the outer stator 1 and a detector 11 which will be described later. Reference numeral 11 denotes a detector for detecting the rotation of the rotor 5, which is, for example, a resolver. Reference numeral 12 denotes a magnetic circuit through which the magnetic flux of the permanent magnet 6 passes. Reference numeral 17 is a gap portion formed by the outer stator 1 and the inner stator 3. The permanent magnets 6 arranged on the outer peripheral surface and the inner peripheral surface of the rotor yoke 7 are magnetized alternately at the N and S poles at substantially equal intervals in the circumferential direction. Further, the winding structure of the coils 2 and 4 respectively wound around the outer stator 1 and the inner stator 3 is a three-phase winding structure in which the number of poles is the same as that of the permanent magnet 6. There is.

The conventional permanent magnet field type synchronous machine is configured as described above,
When a three-phase alternating current is applied to the coil 2 of the outer stator 1 and the coil 4 of the inner stator 3, respectively, the outer stator 1 and the inner stator 3
A rotating magnetic field is generated in the rotor 5, and the rotating magnetic field and the permanent magnet 6 attached to the rotor yoke 7 cause a magnetic action to cause the rotor 5 to move.
Rotates. When the rotor 5 rotates, its rotational position is detected by the detector 11, and a control amplifier (not shown)
Is fed back. Further, as shown in FIG. 5, a magnetic circuit 12 formed in the outer stator 1 and the coil 2 via the permanent magnet 6, and the inner stator 3 via the permanent magnet 6,
Since the magnetic circuit 12 formed in the coil 4 is provided separately, the synchronous machine is equivalently composed of two synchronous machines (an inner rotor type in which the rotor is seen from the outer stator and a rotor from the inner stator). Outer rotor type).

[Problems to be solved by the invention]

In the conventional permanent magnet field-type synchronous machine as described above, if one synchronous machine is equivalently viewed, it is an inner rotor type in which the rotor 5 is seen from the outer stator 1 and an outer rotor in which the rotor 5 is seen from the inner stator 3. Since it is configured with two synchronous machines of the shape, if one control amplifier tries to perform the control operation of the synchronous machine, the two synchronous machines must be operated in parallel and controlled. It becomes the same as what must be done. Therefore, not only is the phase of the current flowing through the coil 2 of the outer stator 1 and the current flowing through the coil 4 of the inner stator 3 that are opposite to each other across the permanent magnet 6 different, but also the outer stator 1 and the inner stator The rate of temperature rise is also significantly different from that of No. 3, and there is a problem that it is not possible to control minute rotation speed and stop the servo system at a fixed position.

The present invention has been made in order to solve such a problem, and it is a permanent magnet field type synchronization capable of more accurately performing minute rotation speed control and servo system positioning stop with a single control amplifier. Aim to get the opportunity.

[Means for solving problems]

A permanent magnet field type synchronous machine according to the present invention has a permanent magnet side coil provided on the outer side of the rotor and a permanent magnet side coil provided on the inner side of the rotor. The coils are arranged in the same radial direction via magnets, and the coils of both stators arranged in the same radial direction are connected in series to form an in-phase coil.

[Operation] In this invention, the coil on the outer stator side and the coil on the inner stator side are arranged in the same radial line direction via the permanent magnets, and are also arranged in the same radial line direction. Since the coils of both stators are connected in series to form an in-phase coil, the magnetic circuit is not formed separately on the outer stator side and the inner stator side, and one synchronous machine is equivalent to the conventional one. As a matter of fact, two synchronous machines are never used, so that one control amplifier can accurately control the rotation speed.

〔Example〕

 FIG. 1 is a partial sectional view showing an embodiment of the present invention.

1 is an outer stator, 2 is an outer stator coil wound around the outer stator 1, 3 is an inner stator, 4 is an inner stator coil wound around the inner stator 3, and 5 is a rotor , 6 are permanent magnets, 7 is a thin-walled cylindrical rotor yoke, 8 is a bearing that rotatably supports the rotor 5, 9 is an end bracket that supports the bearing 8 and the inner stator 3, 10
Is a frame that is attached to the end bracket 9 and supports the outer stator 1 and the detector 11, and 11 is a detector that detects the rotation of the rotor 5, such as a resolver. Reference numeral 12 denotes a magnetic circuit through which the magnetic flux of the permanent magnet 6 passes. The above-mentioned permanent magnets 6 are arranged along the outer peripheral surface and the inner peripheral surface of the rotor yoke 7 so as to oppose each other at substantially equal intervals, and the permanent magnets on the inner peripheral surface side which are in a mutually opposing relationship. The magnet 6 and the permanent magnet 6 on the outer peripheral surface side are magnetized so that the magnetic fluxes are in the same direction as shown in FIG. The coil 2 disposed on the outer stator 1 and the coil 4 disposed on the inner stator 3 which are opposed to each other via the permanent magnet 6 are connected in series so as to have the same phase. . FIG. 3 shows a wiring diagram of the coils in the three-phase synchronous machine, which are in the above-mentioned facing relationship with each other.
b and 4c are coils arranged on the inner stator 3,
2a and coil 4a, coil 2b and coil 4b, coil 2c and coil 4c
Are in-phase with each other.

In the permanent magnet field type synchronous machine configured as described above, when currents having different phases are respectively applied to the coils 2a, 4a, 2b, 4b, 2c, 4c which are connected in series in an opposing relationship. A rotating magnetic field is generated in the outer stator 1 and the inner stator 3,
A magnetic circuit 12 as shown in the figure is formed. Due to the magnetic action of the magnetic circuit 12 and the permanent magnet 6 arranged in the rotor 5, a rotational force is generated in the rotor 5. By the way, as mentioned above, the coils 2a and 4
Since a, coils 2b and 4b, and coils 2c and 4c are connected in series as shown in FIG. 3, coil 2a and coil 2c
Current flows in the same direction in 4a. Similarly, currents in the same direction also flow between the coils 2b and 4b and between the coils 2c and 4c. In addition, the permanent magnet 6 described above is also magnetized to the same pole with the permanent magnet 6 on the inner peripheral side and the permanent magnet 6 on the outer peripheral side that are opposed to each other via the rotor yoke 7, so that they are attached to the outer stator 1 side. The direction of the generated magnetic flux density and the direction of the generated magnetic flux density on the inner stator 3 side are the same, and the magnetic flux and the current can always be made orthogonal to each other.

In the above embodiment, the thin-walled cylindrical rotor yoke 7 is
Although the block-shaped permanent magnet 6 is mainly arranged by using an adhesive, the rotor yoke 7 and the permanent magnet 6 may be formed of an integrated magnetic material. If the material is excellent in strength, the same effect as that of the above-mentioned embodiment is obtained. Further, in the above embodiment, the synchronous servo motor is shown as an example, but it is naturally applicable to a generator, and the number of phases and the number of poles thereof may be arbitrary.

[Effect of device]

As described above, the present invention arranges the permanent magnets along the inner peripheral surface and the outer peripheral surface thereof so as to face each other at substantially equal intervals, and the permanent magnets on the inner peripheral surface side and the outer peripheral surface which are in a mutually opposing relationship. Magnetized so that the magnetic flux with the side permanent magnet is in the same direction, the outer stator side coil and the inner stator side coil,
Since the coils are arranged on the same radial line direction via the permanent magnets respectively, and the coils of both stators arranged on the same radial line direction are connected in series to form an in-phase coil, The magnetic circuit is not separately formed on the outer stator side and the inner stator side, and the effect of more accurate and easy control operation can be obtained with one control amplifier. In addition, the permanent magnets are arranged along the inner peripheral surface and the outer peripheral surface so as to face each other at substantially equal intervals, and the permanent magnet on the inner peripheral surface side and the permanent magnet on the outer peripheral surface side are opposed to each other. Since the magnetic fluxes are magnetized so that they are in the same direction, the direction of the magnetic flux density generated on the outer stator side and the direction of the magnetic flux density generated on the inner stator side are the same, and the magnetic flux and the current can always be made orthogonal to each other. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a partial side sectional view of a permanent magnet field synchronous machine showing an embodiment of the present invention, and FIG. 2 is an enlarged view showing a main part of a permanent magnet field synchronous machine showing an embodiment of the present invention. FIG. 3 is a partial sectional view, FIG. 3 is a connection diagram of coils when the permanent magnet field synchronous machine according to an embodiment of the present invention is a three-phase synchronous machine, and FIG. 4 is a conventional permanent magnet field synchronous machine. FIG. 5 is a partial cross-sectional view showing a conventional permanent magnet field type synchronous machine, as viewed from the front. 1 is an outer stator, 2 is an outer stator coil, 3 is an inner stator, 4 is an inner stator coil, 6 is a permanent magnet, 7 is a rotor yoke, and 17 is a gap. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A rotor having permanent magnets on its inner and outer peripheral surfaces, and an outer stator and an inner stator each having coils arranged in a plurality of grooves provided along the circumferential direction. In the permanent magnet field type synchronous machine having a gap formed by, the permanent magnets are arranged at substantially equal intervals so as to face each other along the inner peripheral surface and the outer peripheral surface of the permanent magnet. The permanent magnets on the inner peripheral surface side and the permanent magnets on the outer peripheral surface side, which are opposed to each other, are magnetized so that the magnetic fluxes thereof are in the same direction. And the stator coils arranged in the same radial direction through the coils of both stators arranged in series to form a common-mode coil. Shape synchronous machine.