JPS61121753A - Flat motor - Google Patents

Abstract

PURPOSE:To reduce the size and to increase the power of a flat motor by disposing a rotary pulse generating printed board to oppose to a rotor pole, and deciding the number of poles of a zigzag pattern formed on the board and the number of poles of a rotor magnet in the prescribed relationship. CONSTITUTION:A multipolar stator coil 7 is disposed oppositely to a flat rotor magnet 13 of opposed flat surface multipolarized at the same angle in the circumferential direction. A rotary pulse generating printed board 11 is disposed to oppose to the magnet 13. The board 11 has a radial zigzag pattern 12, and the number (m) of poles of the pattern 12 is set to m=(2n+1). P/2 when P is the number of poles of the magnet 13, and n=1, 2, 3, ....

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat type electric motor having a rotor magnet and a stator coil that are opposed to each other in a plane, and having a built-in rotary pulse generator.

Structure of a conventional example and its problems An example of the structure of a conventional sieve type electric motor is shown in FIG. In the figure, 1 is a shaft, 2 is a flat rotor magnet, 3 is a rotor yoke, 4 is a rotor boss for fixing the rotor yoke 3 to the shaft, and 6 is a bearing. Further, 6 is a stator yoke, 7 is a multipolar flat iron coreless stator coil arranged and fixed on the stator yoke, and 8 is a stator coil.
is a rotational pulse generating printed circuit board fixed on the stator coil γ. Here, the printed circuit board 8 also forms a pattern for terminal processing of the stator coil 7.

FIG. 3 shows the magnetized state of the rotor magnet 2. As shown in FIG.

The inner diameter side magnetized part 2-1 in the figure is the main magnetic flux magnetized part, 8
The case of polar magnetization is shown. Further, the outer diameter side magnetized portion 2-2 is a magnetized portion for generating rotational pulses, and a case of 66 and s4 pole magnetization is shown, and each is magnetized at equal intervals.

FIG. 4 shows a pattern for generating rotational pulses on the printed circuit board 8 for generating rotational pulses. The number of poles in the pattern of FIG. 4 matches the number of poles of the rotational pulse generation magnetized part 2-2 of the rotor magnet 2 shown in FIG. 3, and the number of poles in the pattern shown in FIG. - Interlinkage magnetic flux φ and induced voltage e
is as shown in Fig. 5, and a rotation pulse can be obtained every 2/number of pole rotations.

However, in the above conventional example, the magnetized part 2-2 for generating rotational pulses is not required on the rotor magnet 2. In other words, the area of the magnetized part 2-1 for main magnetic flux is reduced accordingly, and therefore the motor It had the disadvantage of reduced output.

Purpose of the Invention The present invention was developed in view of the drawbacks of the conventional example described above, and it is possible to obtain a rotation pulse signal similar to that of the conventional example while eliminating the need for a magnetized part for rotation pulses on the rotor magnet. The aim is to make a flat motor possible and to supply a small, high-output motor.

Structure of the Invention The present invention provides a planar flat rotor magnet magnetized with multiple poles at the same angle in the circumferential direction, a multipolar stator coil arranged to face the rotor magnet, and a multipolar stator coil facing the rotor magnet. It is composed of a rotating pulse generating flint substrate which is arranged so as to have a radial zigzag pattern.

DESCRIPTION OF EMBODIMENTS The overall configuration of the flat electric motor according to the present invention is the same as the conventional example shown in FIG. 2, so the explanation will be omitted. explain.

FIG. 1a shows the rotational pulse generation pattern 12 of the rotational pulse generation printed circuit board 11 according to the present invention fixed to the stator side, and unlike the conventional example shown in FIG. Pattern 1 for generating rotational pulses on the entire surface
2 is depicted.

FIG. 1 shows the magnetized state of the rotor magnet 13 according to the present invention, and unlike FIG. 3 of the conventional example, the rotor magnet 13
The entire surface is magnetized for main magnetic flux, and there is no magnetized part for generating rotational pulses. In addition, in FIG. 1, the rotor magnet 1
The number of poles in 3 is explained as 8 poles.

This will be explained in more detail below in Figure 6. In FIG. 6, a state in which the rotor magnet 13 and the rotating pulse generating pattern 12 face each other is shown stretched out in a straight line.

Here, the angle θ0 of one pole of the zigzag pattern of the rotational pulse generation pattern 12 is determined to be an odd-numbered fraction of the angle 20 m of the two poles of the rotor magnet 13. In other words,
The number of poles m of the rotational pulse generation pattern is m=(2n+1
)・−・・・・・・・・・・(1) Formula, where P: Number of poles of rotor magnet 13, n=1.2°3・・・・・・・Determine so that it becomes.

FIG. 6B shows a case where n=2 and the distance between the N and S poles of the rotor magnet 13 corresponds to a zigzag pattern for generating rotational pulses. As is clear from the figure, there is a difference between the number of magnetic fluxes interlinking with the north pole and the number of magnetic fluxes interlinking with the south pole of the rotational pulse generation pattern 12, which is similar to the polarity of the rotational pulse generation pattern 12. The total magnetic flux at one pole of the rotor magnet is Φ
m, then the magnetic flux linkage 'ro of the rotational pulse generation pattern between one pole of the rotor magnet is To==Φ11r/(2n+1)...
=・-12) Expression % Formula % Similarly, the number of interlinkage magnetic flux To of the rotor magnet-pole pair of the rotating pulse generating butter 7 is TO=-Φm/ (
2n+1) ---(Formula 31%Formula %For the total magnetic flux linkage of the rotating pulse generation pattern 12 over the entire circumference of the rotor magnet, (21 and (1) have P/2
You can get it by multiplying each.

Figure 7 shows the total magnetic flux linkage T of the rotational pulse generation pattern.
2 shows how the rotor magnet 13 changes with respect to the rotation angle.

In FIG. 7, the rotation angle of the negative pole of the rotational pulse generation pattern 12, that is, 3eo/m=360°・min/(2n+1
) when the rotor magnet 13 rotates, the period of rotation pulse generation changes by one cycle.

Here, assuming that 0 mX2 is constant, it can be seen that the total number of interlinked magnetic fluxes of the rotational pulse generating pattern 12 decreases as n increases, but the number of pulses per -rotation increases.

Effects of the Invention As described above, according to the present invention, the rotor magnet does not require a magnetized part for generating rotational pulses, and the entire surface of the rotor magnet can be used for the main magnetic flux, resulting in downsizing and increasing the size of the motor. It can be outputted or measured.

Furthermore, since the rotational pulse generation pattern can have the same size in the radial direction as the main magnetic flux magnetization of the rotor magnet, the change in magnetic flux linkage is large, and therefore a large rotational pulse signal can be obtained. , and its practical value is enormous.

[Brief explanation of drawings]

The first diagram is a pattern diagram of a printed circuit board for generating rotational pulses according to the present invention, the first diagram is an explanatory diagram showing the magnetized state of the rotor magnet, and the second diagram is a cross-sectional diagram of a conventional flat motor. , Figure 3 is an explanatory diagram showing the magnetized state of the rotor magnet in the conventional example, Figure 4 is a pattern diagram of the printed circuit board for generating rotational pulses in the conventional example, and Figure 5 is a waveform diagram of the rotational pulse signal in the conventional example. , FIGS. 6a and 6b are explanatory diagrams of a rotational pulse generation pattern according to the present invention, and FIG. 7 is an explanatory diagram of a rotational pulse signal according to the present invention. 13... Flat rotor magnet, 12... Pattern for generating rotational pulses, 7... Stator coil. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure (Mountain 2 Figure 2 Tomoe Figure 4 Figure 6 Figure 7

Claims (1)

[Scope of Claims] A planar facing flat rotor magnet magnetized with multiple poles at the same angle in the circumferential direction, a multipolar stator coil arranged to face the rotor magnet, and a multipolar stator coil facing the rotor magnet. a rotational pulse generating printed circuit board having a radial zigzag pattern arranged so as to A flat electric motor with the number n=1, 2, 3...