JPS63167655A - Permanent magnet type dc motor - Google Patents

Abstract

PURPOSE:To conserve the power of a permanent magnet type DC motor by composing a stator section of a hollow cylinder made of a magnetic material and a permanent magnet secured to the inner wall of the cylinder. CONSTITUTION:A rotor section 1 is composed of a rotor core 9 in which silicon steel plates are laminated, and a winding section 10 wound in the slots of the core 9. The section 10 has a low voltage power rotor winding 10a and a high voltage power rotor winding 10b. A stator section 3 is composed of a cylinder 11a made of a magnetic material as a stationary exciter 11, and permanent magnets 12a, 12b secured to the inner wall of the cylinder 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-speed rotating electric machine, and particularly to a permanent magnet type DC motor.

Conventional technology In general, a DC motor consists of a stator section, a rotor section, and a commutator section.The rotor section consists of a rotor core and rotor windings, and the stator section consists of a fixed core and a rotor winding. A stator winding is wound in a winding slot formed in the fixed core.

(Problems to be Solved by the Invention) In conventional DC motors, since the rotor and stator sections each consist of an iron core and windings, many steps are taken to stack the iron core and wind the windings. In addition to requiring man-hours,
In particular, the stator section is equipped with a winding, and the electric motor becomes larger due to the tth fixed iron core around which the winding +II is wound. Therefore, it is economically disadvantageous because it requires a large number of manufacturing steps and uses an expensive iron core for the stator section. Furthermore, there is a large amount of leakage magnetic flux in the stator section, which reduces efficiency and adversely affects other electrical components.

(Friendly Means for Solving Problems) The present invention has been made in view of the above-mentioned problems, and in a DC motor consisting of a stator section, a rotor section, and a commutator section, the stator is magnetically It consists of a hollow cylindrical body made of wood and a permanent magnet fixed to the inner wall of the cylindrical body.
A permanent magnet type direct current motor with low cost and high performance is obtained.

(Example) A permanent magnet type DC motor according to an example of the present invention will be described below with reference to FIGS. 1 to 5.

Figure 1 is a front cross-sectional view of the permanent magnet type DC motor according to this embodiment. 2 is a sectional view taken along the line T1 in FIG. 1, and FIG.

In FIG. 1, reference numeral 1 denotes a rotor portion which is fixed to a rotating shaft 2. As shown in FIG. 3 is a stator portion formed concentrically with the rotor portion 1;
& is the first bracket fitted to one end of the stator section 3), 4t) is fitted to the other end of the stator section 3
This is the second bracket.

5A is a first commutator section disposed near one end of the rotor section 1, and 5B is a second commutator section disposed near the other end of the rotor section 1. 6a and 6b are the first and second bearing brackets 6m, respectively, which are designed to pivot the rotary shaft 2 to the brackets 4m and 4b;
It is fixedly installed. As shown in FIG. 2, the brackets 41, 4bK are provided with ventilation holes 19 at appropriate locations.

The rotor part 1 is It! As shown in FIG. 3, a rotor core 9 made of laminated silicon steel plates and slots 9 of the rotor core 9
& is formed by the next winding section 10. The winding section 10 includes a first rotor winding 1 (l) for a relatively low-voltage DC power source and a second rotor winding 10 b for a relatively high-voltage power source.

The first rectifying section 5A is fixed to the rotating shaft 2 and has a winding section l.
a first commutator 13 electrically connected to the first rotor winding 10a of the motor;
14b and these brush holders 14&.

The next brushes 15&, 15JL are housed in 148, and the pressure contact springs 16a, 16ab are screwed to the leads 178, 17&, and brush holders 14&, 14B.
It is composed of a, 18&. Similarly, the second rectifying section 5B includes brush holders 14b, 14b, brushes 15b, 15b, pressure springs 16b, 16b, and caps Igb, 18b.

The most distinctive feature of the present invention is the stator section 3, which includes a cylindrical body 11a made of a magnetic material as a fixed excitation section 11, as shown in FIG. 81 and FIG.
It is constituted by a permanent magnet fixed to the inner wall surface of this cylindrical body 11&. In other words, as shown in Figure @3,
Semi-cylindrical permanent magnets 12a and 12b are arranged facing each other on the inner wall surface of a cylindrical body 11 made of a magnetic material and, for example, a cylinder made of iron.

As shown in Figure @4, the inner circumferential surface of the permanent magnet 12& is magnetized to the north pole, and the outer circumferential surface thereof is magnetized to the south pole. (9) The inner circumferential surface of the permanent magnet 12 b H is magnetized to the S pole, and the outer circumferential surface thereof is magnetized to the N pole. Therefore, between the opposing inner circumferential surfaces of the permanent magnets 12& and 12b, lines of magnetic force 20a acting perpendicularly from the inner circumferential surface of the permanent magnet 12a to the inner circumferential surface of the permanent magnet 12b act as shown in FIG.

On the other hand, on the outer circumferential surface of the permanent magnets 12 a and 12 b, a magnetic path is formed by the cylindrical body 11 jL, and a magnetic path is formed concentrically from the outer circumferential surface of the permanent magnet 12 b toward the outer circumferential surface of the permanent magnet 12 a. The magnetic lines of force 20b act on the magnetic field. These lines of magnetic force 20b cancel each other in the cylinder 11&, and the magnetic field on the outer peripheral surface of the cylinder 11& becomes zero.

Therefore, inside the stator section 3, the magnetic flux distribution becomes as shown in FIG.
A magnetic field is generated in the direction perpendicular to the inner wall surface of b, and the magnetic flux density becomes uniform inside the stator section 3.

Then, the magnetic flux inside the stator section 3 effectively interacts with the magnetic flux generated by the current supplied to the winding section 10 of the rotor section 1, and torque loss is drastically reduced, thereby increasing efficiency. improves. Further, since the magnetic field on the outer circumferential surface of the cylindrical body 11& is almost zero and there is no magnetic flux component leaking from the outside, the magnetic force effectively acts as the rotational force of the motor. This improves the efficiency of the rotating body and advantageously eliminates magnetic effects on other surrounding electrical equipment. Also, since the stator part is a permanent magnet, it does not require a power supply, resulting in power savings.

Figure @5 shows the drive circuit of the electric motor of the present invention, in which the first brushes 15a, 15aK are supplied with power from the patch 1121, and the second brushes 15b, 15b are supplied with AC power, which is exchanged to IIfi power by a rectifier. and supplies this DC power. That is, when driving with the battery 21, the switch 22 is turned on and the switch 23 is turned off. This allows the battery 21 to be connected to the first commutator 13 shown in FIG. 1 via the switch n% first brush 15 &
Current is supplied to the rotor windings 10a of & and wcl.

Further, when using an AC power source as a power source, the switch 23 is turned on and the switch 22 is turned off. Thereby, after the alternating current is converted into direct current by the rectifier 24 and smoothed by the capacitor, the switch O, the second brushes 15b, 15b and the second commutator 13
b to the second rotor 10b.

(Effects of the Invention) The present invention is as described above, and since the stator portion is constituted by a hollow cylinder made of a magnetic material and a permanent magnet fixed to the inner wall of the hollow cylinder, the stator winding can be This eliminates the need for the stator, and the stator section is made smaller accordingly, and since power supply to the stator section is not required, power can be saved, and a DC motor with high performance and high reliability can be obtained. It is.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a permanent magnet type DC motor according to an embodiment of the present invention, Fig. 2 is a side view taken from the arrow ■ in Fig. 1, and W.
Figure c3 is a sectional view taken along line I-1 in Figure 1. FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is a drive circuit diagram for driving the permanent magnet type DC motor of the present invention. 1...Rotor section, 2...Rotating shaft, 3...Stator section, 5 people...II! fl rectifier, 5B... second rectifier, 9... rotor core, 10... rotor winding part,
DESCRIPTION OF SYMBOLS 10 &... 1st rotor winding, 10b... 2nd rotor winding, 11... Fixed excitation part, 11a... Cylindrical body, 121L, 12b... Semi-cylindrical shape permanent magnet, 13
JL...first commutator, 13b...@2 commutator. Figure 2 Figure 5 2z ZJ procedural amendment dated October 2, 1939

Claims (3)

[Claims] (1) Consists of a stator section, a rotor section inserted concentrically into the stator section, and a commutator section that controls the current supplied to the rotor section, and the current generated from the stator section In a DC electric motor that obtains the rotational force of the rotor section through the action of magnetic flux and magnetic flux generated from the rotor, a hollow cylindrical body made of a magnetic material and a permanent magnet fixed to the inner wall surface of the cylindrical body are provided. A permanent magnet type DC motor characterized in that the stator section is configured as described above. (2) The cylindrical body is a semi-cylindrical body made of iron, and the permanent magnets are semi-cylindrical bodies fixed to the inner wall surface of the cylinder so as to face each other. Permanent magnet type DC motor according to scope 1. (3) The rotor part has a first rotor winding and a second rotor winding wound in slots of the rotor core, and the commutator part is attached to the rotation axis of the rotor part. It consists of a first commutator and a second commutator that are fixedly installed, the first rotor winding is connected to the first commutator, and the second rotation of the second commutator A permanent magnet type electric motor according to claim 1, characterized in that the permanent magnet type electric motor is constructed by connecting child windings.