JPS5815453A - Rotary signal generator - Google Patents

Abstract

PURPOSE:To obtain a high-durability and precise signal generator even at a low- speed region by a method wherein a magnetic substance is faced to a permanent magnet rotor alternately magnetizing Ns and Ss and a variation in impedance is detected by applying a ripple voltage to coils wound on the magnetic substance. CONSTITUTION:Both leg sections 5a and 5b of an amorphous magnetic substance 5 formed in U-shaped are arranged by facing to a permanent magnet rotor 2 alternately magnetizing N poles and S poles. The space between the leg sections 5a and 5b is equal to the space between the magnetic poles of the rotor 2. Furthermore, two electric coils 6a and 6b are wound on the magnetic substance 5 to alternately apply a ripple voltage to the electric coils 6a, 6b and a variation in the impedance is detected by converting the variation into voltage drop. In this way, a sine-wave rotary signal in which amplitude is always constant and frequency is proportional to the rotating speed of the rotor 2 can be obtained and precise signal detection can be performed even at a low-speed region.

Description

[Detailed description of the invention] This invention relates to a signal generator that generates a signal.

This type of signal generator includes an on-off type that uses the magnetic force of a permanent magnet to close a reed switch, and a type that uses a pick-up coil to induce a voltage according to changes in magnetic force. Those that use a reed switch have a problem with the durability of the reed contacts, and those that use a pick-up coil have a problem that the induced voltage is low when the rotation speed of the permanent magnet loaf is low, resulting in low responsiveness in the low speed range. .

The first object of the present invention is to provide a rotation signal generator of the permanent magnet rotor type, which is highly flexible and has high responsiveness in the low speed range. A second object is to provide a rotational signal generator capable of obtaining precisely synchronized pulses.

In order to achieve the above object, the present invention has a configuration in which a change in fusion flux of a magnetic material due to rotation of a permanent magnet rotor is converted into a change in impedance of the coil by an electric coil, and the impedance is detected to obtain a voltage corresponding to the impedance. do. This has high durability because the only moving part is the permanent magnet rotor, and the impedance of the electric coil is unrelated to the rotational speed of the permanent magnet rotor, so depending on the speed, there is virtually no double pressure amplitude fluctuation. A high sine wave voltage is obtained.

In a preferred embodiment of the present invention, the magnetic material is an amorphous magnetic material.

Amorphous magnetic materials have to be made by rapidly cooling liquid metal, so they are thin plates, and magnetically, they are ferromagnetic, have high permeability and saturation magnetization, have low coercive force, and are mechanically difficult to break. Extremely strong, with excellent elasticity and resilience. This kind of amorphous magnetic material has been described ('
l') When the magnetic flux is saturated in the evening, the electric coil wound around it is likely to cause an inductance change according to the rotation of the rotor.

Mechanically, crushing is easier, and it has high per-plane impact resistance, high per-filtration impact resistance, and high repeatability.

An embodiment of the present invention is shown in FIGS. 1a to 1f.

Figure 1a is a longitudinal sectional view, Figure 11) (1 n - I 1
3 line sectional view, Figure 1C is I C-I C line sectional view, 1st
Figure d is a sectional view taken along the line ID-II), Figure 1C is a bottom view, and Figure 1F is an electric circuit diagram. In the drawings of Kone et al., a ring-shaped permanent magnet 2 is fixed to a rotor 1. The side peripheral surface of the permanent magnet 2 is N-8-N-5- in the circumferential direction.
--It is polarized and magnetized into 1 and 12 poles (S (6 1-pole, 6 N-pole). The rotor 1 is supported by bearings 41 and 42 press-fitted into 1-sinks 31 and 32, respectively. . Since this embodiment is used as a 1-in-1 vehicle, the ends 11 and 12 of the rotor 1 are connected to the output shaft of the transmission, and the other end 11 is connected to the speedometer cable. .

An amorphous magnetic body 5 bent in a tJ shape is arranged near the side circumferential surface of the permanent magnet 2, and the spacing between the legs 5a and 5b is equal to the spacing between adjacent 5N-8 poles of the permanent magnet 2. Electric coils 6a and 6 with 200 turns wound around the legs
b is attached. Electric coils 6a and 6h are connected to connector 8 via leads 7.

Next, the electric circuit configuration will be explained with reference to Fig. 1f.
is a switching circuit, which consists of an open collector type inverter IN,1 connected to one end of one electric coil 6a, and an open collector type inverter IN,1 connected to one end of the other electric coil 6b.
It consists of N2 and IN3. electric coil 6a,
The other ends of 6b are commonly connected together with the smoothing circuit 10 and connected to a constant voltage VCC line via a current limiting resistor R2.

In this embodiment, inverters INI and IN2 include:
A pulse of 50 Kl(z, 50% tutee is applied. In the high level "1" section of this pulse, the inverter I
NI is conductive and one end of the electric coil 6a is connected to the ground, but since the inverter IN2 is conductive and TN3 is non-conductive, one end of the other electric coil 6b is open. Therefore, at the high level "1" of the caballus, current flows through the coil 6a, but no current flows through the coil 6b. In the low level "0" section of the input caballus, this is reversed, and the coil 6a
No current flows through the coil 6b, but current flows through the coil 6b. In this way, the coils 6a and 61] are electrically connected to the alternating pressure.

The coils 6a and 61) exhibit high impedance until they reach the energization level or saturation magnetic flux density, but exhibit low impedance once the value equivalent to the saturation magnetic flux density is exceeded. Therefore, as shown in FIGS. 2a and 21), when the magnetic pole is located directly under the legs 5a and 5b of the amorphous body 5, the magnetic body 5 is saturated by the energization of the coils 6a and 6b. The impedance of the coils 6a and 6b is low, but as shown in FIG.
When the magnetic pole is located in the middle of b, the magnetic body 5 is difficult to saturate, and the impedance of the coils 6a and 6b is high.

When the impedance of the coil is high, the voltage drop is large, so the voltage applied to the smoothing circuit 10 is high; when the impedance of the coil is low, the voltage drop is small, so the voltage applied to the smoothing circuit 10 is low. This results in
The voltages at various parts of the electric circuit shown in FIG. 1F change as shown in FIGS. 3A to 3C as the rotor 1 rotates. Fig. 3a shows the signal in the state shown in Fig. 2a, Fig. 31 shows the signal in the state shown in Fig. 2b, and Fig. 3C shows the signal in the state shown in Fig. 2C.
The signal in the state shown in the figure is shown.

As the rotor 1 rotates, the signal changes as shown in Figures 3a to 3C, so the circuit output OU 'J' eventually shows a sine wave-like fluctuation as shown by the solid line in Figure 4, and the rotation of the rotor 1 One-to-one correspondence with speed.

However, the amplitude VW is constant. Therefore, if the output OUT is now binarized at the level of the two-dot chain line shown in FIG. corresponds to In conventional devices using a pickup coil, the amplitude Vw is small at low speeds,
Since it becomes thicker at high speeds, the present invention's ・ITt
``3 generation
) 47III structure, and moreover, the generated signal transmission 30) processing is only 1 by 1, and accurate (No. 11) is created even in the low speed range.

[Brief explanation of the drawing]

, FIG. 1a is a vertical cross-sectional view of one embodiment of the present invention (), and FIG.
] The figure is a cross-sectional view taken along the line IB-I fl, and Figure 1C (a cross-sectional view taken along the IC-IC line, Figure 1).
Line sectional view, Figure 1e is a bottom view, Figure 1r opening, TI
FIG. 2 is a circuit diagram showing the configuration of an L air circuit. 2nd; 1) 1.
Figures 21) and 2C show permanent (11 times (1) degrees of old amorphous (I legs 5 a of magnetic body 5) of magnet 2,
51) f)″ f position system 1 and it (-J magnetic material 5
Explanation 1, Figure 3a, Figure 31) and Figure 1 (Figure 0 are respectively Figure 22. Figure 2B, Figure 3, and Figure 2C) A waveform diagram showing the voltage of each part of the circuit, Figure 1 shows the voltage of each part of the electric circuit when the rotor 1 is rotating, and the output 2 of the electric circuit.
A straightening pulse P (This is a tights chart showing the river t. 1: Rotor 2: Permanent magnet; U1132:
Casing a, 42: Bearing 5: Amorphous magnetic material 5a, 5b: Legs 6a, 61): Electric coil/l/7. ．． 72: Lead 8 :=1 Nectar
9 Niswitching circuit 10: Smoothing circuit Unexamined Japanese Patent Publication No. 1983 (!'1453 (4)

Claims (1)

[Scope of Claims] (1) A permanent magnet rotor in which north and south poles are formed alternately in the circumferential direction, a magnetic body partially facing the magnetic poles of the permanent magnet rotor, and an electric wire wound around the magnetic body. coil. and a rotation signal generator 1 equipped with an electric circuit that applies a pulsating voltage to an electric coil and converts the impedance of the electric coil into voltage (having two legs that form a U-shaped or U-shaped magnetic path with the 2161i magnetic body) A rotary signal generator according to claim (1), in which an electric coil is wound around each of the legs. (3) The distance between the two legs is set to 8 to
The rotation signal generator according to claim 2, wherein the rotation signal generator is equivalent to the distance between poles. (4) The electric circuit includes a switching means that de-energizes one of the two electric coils when the other is energized and de-energizes the other when the other is energized, and a smoothing circuit connected in parallel with the electric coil. A rotation signal generator according to claim (1), comprising: (5) The rotational signal generator according to claim 1, (2), (3), or (4), wherein the magnetic material is an amorphous magnetic material.