JPS6022458A - Generator for inductor type speedometer - Google Patents

Abstract

PURPOSE:To prevent generator characteristics from varying due to a vibration or an impact of a railway train by composing a shading coil of a stator side coil of high resistance wirings, and composing a closed circuit in the shading coil without using an external resistor. CONSTITUTION:A shaft 1 coupled to a rotationaly shaft of a railway train, and a rotor core 2 of salient-pole structure mounted on the shaft 1 are provided at a rotor side. A stator core 4 which is mounted at the inner peripheral side of the frame 3 is disposed concentrically with the outer peripheral side of the core 2. A field permanent magnet 6 which is disposed in an opposite pole is disposed in a circumferential direction at the stator side, and a pole 5 formed with a salient pole corresponding to the salient pole of the core 2 is composed at the core 4 is composed, and coils 7, 10, 10, 7 are wound circumferentially. The coil 7 is used as an armature coil, and the coil 10 is used as a shading coil. The coil 10 is formed of a high resistance wire, formed in the prescribed resistance, and both ends are shortcircuited by a shortcircuiting wire 11.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an inductor-type speedometer generator, more specifically, a rotor core having a salient pole structure and a field generator provided on the stator side. It is equipped with a permanent magnet and a plurality of coils distributed in the circumferential direction on the stator side, a part of which constitutes an armature coil, and another part of which constitutes a shaded coil. This invention relates to an inductor-type speedometer generator that constitutes a generator.

[Technical background of the invention and its problems]

This type of speedometer generator is attached to the axle of an electric vehicle, for example, and is widely used for detecting the actual speed of a vehicle in automatic train stop control, automatic speed control, and the like. 1st
The figure shows a typical structural example.

The inductor type speedometer generator shown in FIG. 1 has a shaft l that is directly connected to a rotating shaft of a device to be detected such as a vehicle, or is connected to the rotating shaft so as to rotate at a predetermined speed ratio; The rotor side is provided with a rotor core having a salient pole structure attached to the shaft l. A stator core t, which is concentrically arranged around the outer circumference of the rotor core, is attached to the inner circumference of the frame 3. Field permanent magnets 6 are arranged on the stator side so as to have different poles in the circumferential direction, and salient poles corresponding to the salient poles of the rotor core are formed on the stator core. The magnetic pole j is configured and the coil 7 on the hull number side along the circumferential direction is ? , 7 are wrapped. Here, the coil 7 is an armature coil for extracting the output voltage,
The coil is a shaded coil that increases the output voltage.

FIG. 2 is a principle diagram showing the generator of FIG. 1 in which a unit magnetic circuit formed around a permanent magnet 6 is developed in a linear manner. When the rotor core, which forms salient poles, rotates in the direction of the arrow or in the opposite direction, the gap magnetic flux φ
changes in pulsation with respect to time t'VC as shown in FIG. 3 depending on the salient pole. Due to this pulsating change in magnetic flux, an alternating current induced voltage e as shown in FIG. V is generated in the coil 7 according to the law of electromagnetic induction. Since the magnitude of this induced voltage θ changes in accordance with its frequency and the pulsation frequency of the gap magnetic flux φ, that is, the rotational speed of the rotor core, the output voltage of the coil 7 can serve as a speed detection signal.

Now, as shown in Fig. 1, the conventional generator for fin type speedometers is equipped with a number of coils 7, and as shown in Fig. 1, it is standard. I try to use it for.

For example, as shown in FIG. 3, q coils N/.

- coils N/, N among N, 2, Nj, Nj
This is used as the armature coil 7.7 by connecting it in series. In that case, the other two coils N3. NII is designed to increase the output voltage of armature coil 7.7.
They are used as so-called round coils, each forming an independent closed circuit via a resistor of several hundred ohms.

The induced voltage characteristics of the armature coil 7 change depending on the resistance value R of the resistor.
The figure shows an example of actual measurement at 00Ω and R-100Ω, with the horizontal axis representing the rotational speed. As you can see from the figure, R-10
The induced voltage in the armature coil 7 at the time of 00 is increased by approximately 100% compared to the time when H=■, and by making the resistance even lower to R-100Ω, the induced voltage is further increased. However, as the resistance value F of the resistor is decreased, the current flowing through the circuit increases as shown in Figure 7.
The Joule heat of VC increases, and the temperature of the shaded coil r rises accordingly. Therefore, the resistance value R of the resistor connected to the shaded coil r is 1 [ff
The optimum value is selected each time depending on the induced voltage characteristics of the armature coil 7 and the constraints on the temperature rise of the winding coil g.In the case of a generator mounted on a vehicle, n
It is common to set it to +tθOΩ. As this resistor, a commercially available product that is generally used as an electronic circuit component is used, and the connection to the shaded coil r is made by soldering.

Conventionally, when used in vehicles that experience severe vibrations and shocks, the resistor itself or the connection between the resistor and the coil may become disconnected, resulting in a loss of automatic control functions due to inability to detect train speed. Improvements were desired.

[Purpose of the invention]

An object of the present invention is to provide an inductor type that maintains sufficient output voltage characteristics and has sufficient mechanical strength and reliability even in environments with severe vibrations and shocks such as when used on a vehicle. The purpose of the present invention is to provide a generator for speedometers.

[Summary of the invention]

To achieve this objective, the invention is characterized by the following accomplishments at the outset.

[Embodiments of the invention] □ FIG. 2 shows an embodiment of the present invention.

The basic structure of this inductor-type speed quoting generator is the same as that in FIG. The difference between the two is that in the generator shown in Fig. g, the shaded coil 10 is separated from the high resistance wire;
The external resistor shown in the figure is omitted, and both ends of the shaded coil 10 are short-circuited by a short-circuit wire l/. As a high resistance wire, for example, resistivity /! It is sufficient to use a high-resistance copper-nickel wire with a resistivity of about 0 μΩ・m, and by using this, it is almost the same as the conventional shaded coil t (Fig. 1) using a copper wire with a resistivity of about 7.71 μΩ・m. The coils have the same external shape and number of turns, and from the table, it is possible to obtain a resistance corresponding to the sum of the resistance of the conventional shaded coil r and the resistance of the external resistor by using the coil alone. Incidentally, the resistance of the shaded coil in Figure 1 is about 6Ω, and the resistance of the resistor is j10Ω.
Therefore, the resistance of the shaded coil/θ in Fig. r is designed to be approximately nJΩ.

In this way, the external resistor can be omitted, the external shape can be made the same, and the same function as the trench-reducing coil can be provided. By omitting the external resistor, it is possible to avoid mechanical strength problems around the resistor such as resistor connections and resistor disconnections.

In addition, in the present invention, which does not use an external resistor, there is no need to take the trouble of using a shorting wire, and instead of using a
Both ends of the Ta recoil 10 may be directly connected. This method requires fewer work steps and fewer connection points, so it is advantageous in constructing an inexpensive and highly reliable shade removal coil.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain the same shade coil function as using an external resistor with the same external shape without using the conventional external resistor. . By omitting the external resistor, it prevents fluctuations in generator characteristics due to disconnection of one resistor even in environments with severe vibrations and shocks such as in railway vehicles, making it more reliable for inductor-type speedometers. Generators can be provided.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional generator for an inductor type speedometer, Fig. 2 is an explanatory diagram for explaining the operating principle of the generator for an inductor type speedometer, and Fig. 3 is a cross-sectional view of a conventional generator for an inductor type speedometer. The figure is a waveform diagram showing the gap magnetic flux and induced voltage of a generator for an inductor type speedometer. Figure 5 is a wiring diagram showing an example of the use of a large number of coils. FIG. 5 is a characteristic diagram showing the induced voltage characteristics when the wiring is connected as shown in FIG. 5. FIG. /...shaft, co...rotor core, 3...frame,
t...Stator core, j...Magnetic pole section, 6...Permanent magnet, 7...Armature coil, 10...Beam removal coil. One representative: Inomata Kiyoshi 5th Ward

Claims (1)

[Claims] A rotor core having a salient pole structure, a field permanent magnet provided on the stator side, and a plurality of coils distributed circumferentially on the stator side, A generator for an inductor type speedometer in which a part of the plurality of coils constitutes an armature coil and another part constitutes a shaded coil, wherein the shaded coil is composed of a high resistance wire, (An inductor-type speedometer generator characterized by forming a closed circuit without using a foreign resistor in the coil.