JPS62207164A - Frequency-generator built-in dc motor - Google Patents

Abstract

PURPOSE:To obtain a large frequency signal by forming conductive patterns for forming a frequency generator displaced at a predetermined electrical angle onto both surfaces of a printed substrate and synthesizing outputs from these patterns. CONSTITUTION:A conductive pattern 18 for shaping a comb-teeth-shaped frequency generator is formed onto the upper surface of a printed substrate 6. A conductive pattern 18' for shaping a frequency generator, which is the same as the conductive pattern 18 and has a generating wire element 18'b, an electrical angle thereof is displaced at 90 deg. from a generating wire element 18b for the conductive pattern 18, is formed to the lower surface of the printed substrate 6. One ends 18d, 18'd of these conductive patterns 18, 18' are connected, the other ends 18a, 18'a are connected to terminal sections 19, 21, and frequency signals acquired by both conductive patterns 18, 18' are synthesized and lead out.

Description

[Detailed Description of the Invention] (Industrial Application Field of the Invention) The present invention provides frequency generation 1! Regarding a DC motor with a built-in rock.

(Prior art and its problems) As a DC motor with a built-in frequency generator, for example, flJ
There is a disc-type brushless motor 1 shown in FIG. This motor 1 has three groups of six air-core armature coils arranged on a stator yoke 2 as shown in FIG.
It constitutes fIL machine 4.

On the upper surface of the stator armature 4, a printed circuit board 6 on which a conductive pattern 5 for forming a comb-like frequency generator is formed is disposed as shown in FIG. A position sensing element 7t is provided. The pitch of the 119 effective generator elements 5a contributing 6 to the power generation in the radial direction of the conductive pattern 5 is formed to be equal to the pitch per pole of the multi-pole magnet section 8 for forming the frequency generator 'Wt+a, which will be described later. 5b is a terminal of the conductive pattern 5. A bearing 9 is provided on the stator yoke 2, and the shaft 101k1g16 is freely supported by the core bearing 9. A rotor yoke 11t is fixed to the shaft 10, and a magnet rotor 12 as shown in FIG.
is fixed and made to face the stator's isogo 4 and the horizontal magnetic pattern 5. The magnet rotor 12 is N,
The magnetic poles of S are alternately magnetized into 8 poles at equal intervals to form the driving magnetic pole part (
A field magnet) 16 is formed, and multipolar magnetization is performed on the outer periphery of the driving magnetic pole part 16 and on the surface facing the conductive pattern 5 to form a multipolar magnet part 8 for forming a 5-frequency power generation basin. ing. In the multi-pole magnet section 8, N1ksN'-pole multi-pole magnetized sections 8 are alternately formed on the N-pole drive magnetic pole section 16, and S-pole i9/poles are formed on the drive magnetic pole section 16 of item 8. The multi-pole magnetized portions 8 are alternately formed. The N/, rear pole is more weakly magnetized than the N pole, and the S' pole is also weaker than the S pole.

Therefore, the N' pole is functionally equivalent to the S pole, and the S' pole is the functional equivalent of the N pole. For this reason, the multi-pole magnet section 8 is magnetized with N poles and si' alternately at a fine pitch.

FIG. 5 shows the magnetic flux density forming 14 of the magnet Rome 8. This waveform 14 is such that the magnetic flux density waveform 16 of fine irregularities caused by the multipolar magnet part 8 is not superimposed on the magnetic flux density waveform 15 obtained by the driving magnetic pole parts 13 of N and S poles.

Therefore, if the armature coil 6# is passed through by the signal from the position detection cord 7, the motor 1 will rotate in a predetermined direction according to Fleming's left hand rule. Also, since the multipolar magnet section 8 rotates relative to the power generating line element 5a of the conductive pattern 5, a frequency signal 17 as shown in FIG. 6 is obtained from the terminal 5b of the conductive pattern 5. Therefore,
This frequency 6 (No. 17) is converted into t!i pressure for speed control using an F-V conversion circuit, and based on this voltage, the motor 1 can be controlled at a constant speed by the energization control circuit. .

The larger the output signal waveform of the frequency signal of the frequency signal built in the frequency power generator for constant speed control, the more useful it is for controlling the motor 1t at a constant speed. For those who want to do this, the magnetic flux density of the multi-magnet section 8 can be increased, but
There are limits to how this can be done.

(Problem of the present invention) The present invention aims to obtain a dog-shaped frequency signal by improving the conductive pattern for forming a tooth-shaped frequency power generation shield without increasing the magnetic flux of the multi-pole magnet portion 8. Take it as a challenge.

(Means for achieving the object of the present invention) The object of the present invention is to connect a conductive pattern for forming a frequency power generation depression formed on one surface of a printed circuit board to one terminal of the conductive pattern and to be offset from the conductive pattern by 90 degrees in electrical angle. Seven conductive members for forming a frequency generator are formed on the other surface of the printed circuit board.

This can be achieved by obtaining a frequency signal that is a composite of the A-phase and B-phase frequency signals obtained by the two conductive patterns from the other terminal of the two conductive patterns.

(Embodiment of the present invention) The parts common to the above-mentioned FIGS. 1 to 6 form the terminal portion 6da, which has been explained in detail. On the upper surface of this printed circuit board 6, a comb-shaped conductive pattern for forming a frequency generator similar to the conductive pattern 5 in FIG. 't- is formed into a comb-tooth shape over approximately one circumference, and then folded back to form a canceling coil 18ct on the outer periphery of the power generation line element 18b, and formed near the other end 18a, and then into the friend through hole 20. One end thereof is connected to 18dt. On the lower surface of the printed circuit board 6, one end ia'a6 is connected to the through hole 20, and a wire element 1 which is similar to the conductive pattern 18 and from which the conductive pattern 18 is connected is connected to the through hole 20.
Power generating line element 18'bt which is shifted by 90 electrical degrees from 8b
The other terminal 18'a of the nuclear conductor pattern 18/ is formed in the glass part 6a and connected to the solid conductive terminal part 21. A through hole (not shown) is formed in the terminal portion 21, and the other end 18 &
and the terminal portion 21t- are electrically connected. Above through hole 2L
One end 18d of conductive patterns 18 and 18' is connected through l'it.
8 and 18/d can be easily connected by the method shown in FIG. 9. Referring to FIG. 8, by using a through-hole board as the printed circuit board 6 and forming a copper foil 22 directly in the through-hole 20 of this board, one end 18d
and 18'd are electrically connected.

Referring to FIG. 9, a through hole 20 is formed in the printed circuit board 6, a conductive pin 26 for connection is inserted into the through hole 20, and solder 24 is soldered to both sides of the pin 24, one end 18d, and a conductive pin 2.
6. +: +118' d is electrically connected. Therefore, the multipolar magnetized magnet part 8 and the conductive pattern 18.18'
When the two rotate relative to each other, a large composite frequency signal 25 as shown in FIG. It should be noted that the conductive pattern 18 is shown in FIG.
) is obtained, and the phase is shifted by 90 degrees in electrical angle due to the conductive pattern 18'. Instead, the frequency signals 25a and 25b are combined to form a composite frequency signal 25 with a large value that is easy to control as shown in FIG. It will be done. This composite frequency signal 2
5 is converted into a speed control voltage by the F-V conversion circuit, and by feeding back this voltage to the energization control circuit, the brushless motor can be controlled at a constant speed.

In the above embodiment, the present invention is applied to a disk-type brushless motor, and a cup-containing brushless motor may also be used. It goes without saying that a commutator DC motor or a cored DC motor in which the armature rotates may also be used.

(Effects of the Invention) According to the present invention, in order to obtain many frequencies, the frequency oscillation m
Even if a multi-pole magnetized magnet for machine forming is magnetized to a large number of poles, or even if the multi-pole magnet cannot be strongly magnetized, the frequency generation Pi! By simply devising the conductive pattern for forming Lta, it is possible to obtain a large frequency signal that is easy to handle, and a DC motor that generates a frequency with high precision.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a disc-type brushless motor as an example, Figure 2 is a plan view of the '11tts child coil group that constitutes the stator armature of the brushless motor, and the third factor is the frequency power generation of the brushless motor. Figure 4 is a bottom view of the magnetic rotor of the brushless motor, Figure 5 is the magnetic flux density waveform of the magnetic rotor, and Figure 6 is the frequency obtained by the conductive pattern for frequency generator formation. Signal waveform, Fig. 7 is an explanatory diagram of the conductive pattern for frequency power generation of the present invention, Fig. 8 is an explanatory diagram of the method of connecting the conductive pattern on the upper surface and the conductive pattern on the lower surface, and Fig. 9 is the connection included in the package. Illustration of the method, Part 1 (1(a)
-(e) are explanatory diagrams of frequency signals obtained by a frequency generator. DESCRIPTION OF SYMBOLS 1... DC motor with built-in frequency generator, 2... Stator yoke, 6... Armature coil, 4... Stator armature, 5... Conductive pattern for forming frequency generator, 5a...・Effective power generator, 5b...terminal,
6... Printed circuit board, 7... Position sensing confectionery, 8
...Multi-pole magnet part for forming frequency generator, 9...
・Bearing, 10...Shaft% 11...Rotor yoke. 12... Magnet rotor, 16... Drive magnetic pole part (field magnet), 14,15.16...
Magnetic flux density waveform-17...frequency signal, 18...
Conductive pattern for forming frequency power generation α, 19... Conductive terminal portion, 20... Through hole, 21... Conductive terminal portion,
22...Copper foil. 26... Conductive bottle for connection, 24... Solder,
25...Synthetic frequency signal. ``Patent use'' human land edict vJz diagram Figure 4 Figure 7 Figure 8

Claims (1)

[Claims] In a DC motor with a built-in frequency generator in which either a field magnet or an armature is a rotor and the other is a stator, a multi-pole magnetized magnet for forming a frequency generator provided on the rotor, and the multi-pole A printed circuit board disposed on a surface facing the magnetized magnet, a comb-shaped conductive pattern for forming a frequency generator formed on one surface of the printed circuit board, and a conductive pattern connected to one terminal of the conductive pattern and connected to one terminal of the conductive pattern. A DC motor with a built-in frequency generator, comprising a conductive pattern for forming a frequency generator formed on the other surface of a printed circuit board at an electrical angle of 90 degrees from the conductive pattern.