JPH0213258A - Coil position detecting element and position detector - Google Patents

Abstract

PURPOSE:To simplify the structure by polishing the in and out sidefaces of a coil and exposing the conductor section in order to obtain a coil in the form of a chip part then pressure fitting metal rings to the in and out sidefaces and providing terminals. CONSTITUTION:A position detecting element, i.e., a coil 1a, is thermally set or set while being immersed with plastic material as required. After this process, the inside face A and the outside face B are polished to expose the conductor section of a wire while simultaneously inner and outer diameters are set to set values. Then terminals 2a, 2b are formed at the start-of-winding and the end-of-winding of the wire, and a metal ring 3b is pressed into the outside face A of the coil 3 1a. An identical metal ring 3a is pressed into the inside face A of the coil 1a. By such method, the coil 3a can be obtained as a chip part which can be mounted effectively on a printed board, and thereby the size and the cost of a position detector can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] Used as a rotor position detection device for a reluctance type electric motor.

[Conventional technology]

The general means for obtaining a position sensing signal by utilizing changes in the impedance of a coil is well known.

('Problems to be solved by the present invention) The first problem is that the coil serving as the position detection element is a small diameter, flat coil with about 100 turns, a thickness of 1 mm, and an outer diameter of within x mm. There is a problem in fixing the coil at the required position on the armature and performing the required wiring.

That is, the process of processing the coil terminals and accurately fixing the wiring and coil positions to the support is a problem, which increases the price.

The first problem is that the gap between the coil surface and the protruding surface of the conductor rotor must be within 1 millimeter, so it is difficult to create a configuration that maintains this during mass production.

At the same time, it is necessary to minimize the length of the motor outer casing in the direction of the rotating shaft. Depending on the purpose of use, it is necessary to use a flat electric motor. In such a case, the configuration of the position detection device becomes a problem.

As a third problem, there is a problem in that the position detection output is obtained as much as possible, and it is necessary to obtain a stable output.

[Means to solve problems]

As a first means, the coil is configured as a chip component,
...It can be mounted on an hybrid board (printed board).

For this purpose, the inner and outer surfaces of the coil are polished to expose the conductor portion, metal rings are press-fitted into the inner and outer surfaces, and this single metal ring is used as a terminal.

The configuration described above solves the first problem.

As a second method, a conductor rotor is made by punching out an aluminum plate having the same shape as the rotor and its salient poles, only the protruding portions are bent at right angles, and this is rotated so that it rotates coaxially and synchronously with the rotor. Attach to the side of the child.

At this time, the bent portion is bent outward, and the bent surfaces are configured to be within the same circumferential surface.

A bent portion surface within the circumferential surface faces the coil surface with a gap interposed therebetween.

The above configuration solves the first problem.

As a third means, by using a coil serving as a position detection element as the inductance of the Rubit oscillation circuit, a position detection signal with a large S/N ratio can be obtained.

[Effect]

With the first method, the coil is made into a chip, which facilitates mass production. If the circuit that processes the output of the special coil is implemented as an IC, the above-mentioned mass productivity will be significantly improved and the cost will be reduced. According to actual measurements, the metal rings on the inner and outer surfaces of the coil have no negative effect on the position detection output.

By the first means, there is no need to provide a separate rotor bay for the conductor rotor, so it is possible to configure the IT motor to be flat.

Generally, the width of the protrusion of the conductor rotor is 170 degrees in electrical angle, but by making it less than ljQ degrees, it is possible to obtain a position detection signal for a co-phase reluctance motor rotating at high speed.

According to the third means, it is possible to obtain a position detection output that is heat resistant and has a good S/N ratio.

In particular, in the embodiment shown in FIG. 3 (=), the output is large and the SN
A position detection signal with a good ratio can be obtained.

〔Example〕

The details of the apparatus of the present invention will be explained with reference to the embodiments shown in FIG. 1 and subsequent figures. Members with the same symbols in the drawings are the same members, so duplicate explanations will be omitted.

FIG. 1 shows a coil/4 which serves as a position detection element, and has an outer diameter of about J mm, a thickness of about 1 mm, and a number of turns of about 100.

The coil 18 is heated and solidified, and if necessary, a plastic material is impregnated between the wires and solidified at °C.

After that process, the inner full surfaces 11 and 4 and the outer surface lJ are polished to expose the conductor portion of the electric wire, and at the same time, the inner diameter and outer diameter are set to the set values.

The symbols - conductor and C b indicate the terminals of the wire at the beginning and end of winding. Figure 7 (b) is a side view of the coil I, the length of arrow C is j mm.

The coil/$ is circular, but may also be oval.

FIG. 2 shows a metal ring 3b, which has a thickness of 0. J
It is made of a metal that can be soldered with IJ meters.

The metal ring 3b is press-fitted and fixed to the outer surface H of the coil/s, as shown in FIG. 1(6)K.

A metal ring 3@ having the same configuration is press-fitted and fixed to the inner surface B of the coil IIs.

Therefore, the metal rings 3m and 36 serve as both terminals of the coil l$, and at the same time, the inner and outer diameters can be set to predetermined dimensions.

Therefore, it becomes a chip component, which is an effective means when mounted on a printed circuit board, and has the effect of being able to be constructed in a small size and at low cost.

The inner and outer coils of the coil l@ are short-circuited, but according to actual measurement data when used in the device of the present invention described later, there is almost no effect.

Figures 3(b) and 3(e) are electrical circuits for obtaining position detection signals.

In Figure 3 (@), coil /@, /b, resistance lA@
Hirob lle ψd constitutes a set of bridge circuits, and is supplied with power from a high frequency oscillator 7 (/~2 megacycles). Coil /b has exactly the same configuration as coil l@.

Coil 1s /I! When a conductor plate approaches one side of l,
Impedance is reduced due to eddy current losses.

The bridge circuit described above is arranged to be balanced when the conductor plates are spaced apart.

Diode Soz, rb,! e and capacitor 44
/Jb be is a low-pass filter.

When the conductive plate approaches the coil /6, the voltage drop across the resistor increases, and the voltage at the output terminal 9 of the operational amplifier becomes high level. When a conductor plate approaches coil /b, the voltage drop across resistor pb increases and the output terminal of operational amplifier gb increases. The output of b becomes high level.

The capacitors 6α l, h l, e are not necessarily required. This is because the carriers of the transistors, which are the circuit elements of the operational amplifiers Ha and gh, disappear due to their disappearance time, and are automatically smoothed after rectification by the diode.

An example of the means for obtaining the above-mentioned position detection signal will now be described with reference to FIG. 6.

FIG. 6 is an explanatory diagram of a well-known glue roughtance type co-phase motor. A magnetic rotor J is fixed to a rotating shaft rotatably supported by a bearing on the main body.

On the outer periphery of the rotor m, there are salient poles X) @ , # b ・
... are arranged, the number of salient poles is 10, and they protrude with equal width and pitch as shown in the figure.

The rotor J is made of silicon steel plate by well-known means. By the same means, the armature $ core / and the magnetic poles protruding from its inner part /9 @, /? b, ”・is constructed.

The number of magnetic poles is t, and they are arranged at equal angles apart as shown.

Magnetic pole/? Excitation coils αnb . . . are wound around α, it b , . . . . Magnetic pole/90. /9
(The excitation coils at t... are omitted and are not shown.

Magnetic pole i'y b and/? When f is excited to the NS pole, the opposing salient poles are attracted, and the electrical angle is qo degrees (
From now on, the display of electrical angle will be omitted. ) The rotor J rotates. At this time, magnetic pole /9 e/? g is also excited to N and S poles.

Excitation magnetic pole is (/de b, /def, /96./9!l)→
By cyclically alternating (/? e, yq g, /? d, yq person) →, the rotor J becomes a co-phase electric motor that rotates in the direction of arrow G.

In the above case, a one-position detection signal is required to control the energization of the excitation coil.

For this purpose, the coil 1@, tb of Figure 3 is used.
The 1° coil Ia 1b may face the sides of the salient poles xa, xb, etc. with a phase difference of 90 degrees.Also, an aluminum plate with the same shape as the rotor J may be made and the rotor
The coil lts l is rotated synchronously with the protruding part.
b may be opposed to each other.

However, the gap between the coil surface and the salient pole serving as the conductor or the above-mentioned protrusion needs to maintain accuracy on the order of os millimeters.

For the reasons mentioned above, the following measures are effective.

That is, an aluminum neem plate with a thickness of O2S millimeters is processed to have the same shape as the rotor X, and after bending the protrusion at a right angle, it is stacked and fixed to the first rotor.

Symbols M a, M b . . . in FIG. 6 indicate bent portions 400. Further, symbol 2 Otsu C indicates a conductor rotor having a protruding bent portion.

Thereafter, the outer circumferential surface of the bent portion is polished to make it the same circumferential surface.

FIG. 7 Ill shows a perspective view of the exposed salient pole and the bent roller part. Bending part ≦a, 26 b・
... need not be in phase with the salient poles x e , 20b ....

Also, bent portions 26α, 21. The bending positions of the salient poles 20a, xb, etc. are not the illustrated positions, for example,
, . . . may be the outer peripheral surface.

The coils 1a and 1b are fixed to the main body at the position shown in FIG. 6, and are connected to the bent portion through a gap.

26b ... is facing. Therefore, the coil 1s
The position detection signal due to lb is I with a width of ItO degrees, respectively.
This results in high-level electrical signals spaced apart by rO degrees.

Mata Coil/@/I! Since the phase difference between the position detection signals of l is 90 degrees, the exciting coils w a ,
By controlling the energization of a, b, . . . , it rotates as a co-phase rough tan machine.

As can be understood from the above-mentioned configuration, the bent portions 2411, 24b, etc. of the conductor rotor rollers K are integrated with the rotor J, so the configuration is simplified, and the coils ls lb This has the effect of making it possible to have a small gap with the surface, making it possible to be more accurate.

Moreover, the thickness of the electric motor (the length in the direction of the rotating shaft core in FIG. 4) can be reduced and a flat type electric motor can be constructed.

Figure 5<8), (What is shown in the phrase is the coil l error 1
6 shows means for fixing 6 to the main body.

In Fig. 5, the symbol C is a printed circuit board with a coil l@ib fixed to the arcuate surface, as shown by the same symbol K in Fig. 3(b).The symbol C is an integrated circuit (IC). The wiring between the No. 7 IC bin and the coil/@lb and other necessary components is done by well-known means.

In the case of a small-output TA machine, the circuits other than the power stage connected in series with the excitation coil are housed in the ICn, but in the case of a high-output model, only the wiring for the coil 1s lb is housed in the printed circuit board. The other circuits are installed outside the motor.

FIG. 3(b) shows means for attaching the printed circuit board to the main body.

That is, the symbol? O indicates the armature of the motor is fixed, and the dotted line indicates the protruding bent part of the conductor rotor (shown with the same symbol in Fig. 6) fixed to the rotor I. b@, 2b
b indicates the position of the outer peripheral surface of...

Therefore, as the rotor rotates, the surface of the coil/g lb is bent by the bending part 4. Since the surfaces 4b, .

FIG. 9 is a graph of the position detection signal described above.

In FIG. 9, the bent portions 6/&, 21rb of FIG.

... are shown with the same symbol.

Coil /s and 1b are separated by 90 degrees, and their surfaces are at the bending part u.
A @ , u4 b . . . are opposed, and the bent portion rotates in the direction of arrow G.

The output signal of the terminal 9@ in FIG. 3 (1) by the coil 16L becomes a curve ko l or a curve −. The former is the curve shown in FIG. In this case, the output from the terminal 9b by the film/AK becomes an exactly similar electrical signal, but with a phase difference of 90 degrees.

The width of the position detection signal can be freely changed by changing the length of the bent portions 26g, 24b, . If the width is taken as , lza will be smaller than 0 degrees.

Furthermore, by changing the shape of the bent portions uA a , jA b , . . . , the shape of the position detection signal can be changed.

For example, if the song is changed to @W, the position detection signal by the coil/s becomes like a curve evaluation.

In general, the torque curve for each pole of a reluctance type electric motor is as shown in point A, so it is possible to make the output torque almost flat by energizing the excitation coil in proportion to the curve. Therefore, we can provide effective means.

FIG. 3(e) is another embodiment of a circuit for obtaining a position sensing signal.

In FIG. 3(b) Ic, the symbol 7 is the same as the oscillator with the same symbol in FIG. 3(@).

Capacitor io @ and coil /4 form a series resonant circuit.

Therefore, when the conductor portion enters the surface of the coil l@, it shifts from the resonance point and the amplitude becomes smaller.

Furthermore, since the diode 11b and the capacitor 11b form a voltage doubler circuit, the input to the child terminal of the operational amplifier 1 becomes significantly larger than in the case of FIG. 3(4).

Diode // n Port consisting of capacitor 10d +
++ The input to one terminal of the operational amplifier 1 by the Hass filter is adjusted so that when the conductor enters the surface of the coil 1, the output at the terminal 13 of the operational amplifier 1 becomes zero.

With the above configuration, the surface of the coil 18 is connected to the conductor roller 11.
The position detection signal when 2AA,... passes is the third
It is possible to obtain a result that is more than one times that of the embodiment shown in the figure (@).

The plug circuit has the same circuit configuration as the circuit described above, and uses the coil 1b to connect the phase 9 from the terminal /Jb.
This is to obtain position detection signals that differ by 0 degrees.

Therefore, the output signals of terminals /J 1 and /J b are the same as the output signals of terminals 9 @ and de b in FIG. 3, and the same purpose is achieved.

Figure 3 (In the case, coil 1s capacitor/3@
,/! rb and the transistor 16 constitute a Colpitts oscillation circuit, and when the coil l@ is separated from the conductor part [
)':! ,/megacycle oscillation is observed.

The structure is such that oscillation stops when the conductor comes close to the coil l@. The symbols /e @ and /lIh are the positive and negative terminals of the DC power supply.

The electrical signal rectified by diode /7 is
7'yt K□kaa. Even if there is no smoothing capacitor, the 6.4 trillion yen is smoothed because there is a time for the carriers in the transistor included in the operational amplifier 1K to disappear, and the output of the terminal /l Z is the position of the rectangular wave. It becomes a detection signal.

The position detection signal has an inverted 0 phase which is even larger than in the previous embodiment, but it can be used as a position detection signal.

Pu ¥2. The circuits M and N have the same configuration as the above-mentioned oscillation circuit including coils /b/e, respectively, and the terminals iz b
, *it a provides a position detection signal.

If only coils /nL and /b are used, as in the previous example,
A co-phase position detection signal that drives a λ-phase reluctance motor is obtained.

Also, if a coil //- is added and arranged so that the phase difference of filter t@tb/Q is 120 degrees, terminal 7g.
The phase difference between the output signal needles /l b and /l· is obtained, and a three-phase position detection signal that drives a three-phase reluctance motor can be obtained.

[Effects] Becomes a position detection element; Il/@, /b IC can be made into a chip, and it has the advantage of being small and easy to mount on a printed circuit board.

Since it is possible to obtain a position sensing element that is less expensive and more heat resistant than a Hall element, it is an effective technique when applied to reluctance type electric motors with large output.

By configuring the conductor rotor rollers as shown in FIGS. 6 and 7, the electric motor can be constructed flatly and the construction can be simplified.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a coil according to the present invention, Fig. 2 is a perspective view of a metal ring fitted around the outer circumference of the coil, Fig. 3 is an electric circuit diagram for obtaining a position detection signal, and Fig. , position detection signal, output torque graph, zth (54 is an explanatory diagram of the 1-position detection device, FIG. 6 is an explanatory diagram of the co-phase reluctance motor, and FIG. 7 is a perspective view of a part of the same. Shown. 7a 1h lI?...Coil, A B,...
, inner and outer peripheral surfaces of the coil l explosion, 2@cob +e+:
+ illumination terminal, 3@. 3b...Metal ring fitted on the inner and outer circumference of the coil, Ri...High frequency oscillator, gs
gb, l coα, 1g... operational amplifier, 1), M,
N...Block circuit that obtains position detection signals from coils 1b and 1e, n, YuA@, 24b. ...Bending portion, 26...Conductor rotor, 2/=
...position detection signal curve, evaluation, evaluation α...torque curve, 3...printed circuit board, λ9...IC30.
...Outside the main body H, xr, wΦ, r b, ... Rotor and salient poles, /l, /9, /96 ... Armature and its magnetic poles, : IJ conduction, 2! rb: Excitation coil.

Claims (2)

[Claims] (1) In a reluctance type electric motor, a conductor disk is provided such that the outer circumference of the protruding bent portion surface having the same pitch as the salient poles of the magnetic rotor is within the same circumferential surface, and the conductor disk means for attaching and fixing the armature to the side surface of the magnetic rotor so that it rotates coaxially and synchronously with the rotor; A plurality of flat coils are arranged at a set separation angle with the coil surfaces facing each other with a gap between them, and a high-frequency current is applied to each coil, so that the protruding bent surface is formed on the coil surface. 1. A position detection device using a coil as a position detection element, characterized by comprising an electric circuit that detects a change in impedance when facing each other and obtains a position detection signal. (2) In a reluctance type electric motor, a conductor rotor coaxially rotates synchronously with a magnetic rotor, protrusions arranged at equal pitches on the outer periphery of the rotor, and polished inner and outer surfaces. a ring-shaped coil with the conductor portion of the electric wire exposed; first and second metal rings press-fitted into the inner and outer surfaces of the coil; and a ring-shaped coil fixed to a part of the fixed armature. The first of the coils in the set position of the printed circuit board,
A second metal ring is soldered to perform the required wiring, and the coil surface is opposed to the above-described protrusion surface through a gap, and changes in the impedance of the coil are detected.
1. A position detection device using a coil as a position detection element, characterized in that it is constituted by an electric circuit for obtaining a position detection signal.