JPS5836586B2 - Mussetten motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-contact motor using a magnetically sensitive element.

The present invention relates to a non-contact motor in which positioning for magnetic flux detection is made accurate and easy by inserting and fixing another board to which a magnetically sensitive element is added within the drive coil.

An object of the present invention is to be able to accurately and easily determine the magnetic flux detection position of a magnetically sensitive element.

Another object of the present invention is to have good workability and to be suitable for mass production.

In order to make the present invention easier to understand, the principle of operation of a non-contact motor will first be explained with reference to FIGS. 1 to 5.

An exploded view is shown in FIG. 1, and a cross-sectional view is shown in FIG.

Permanent magnets 1 and 2 are magnetized into six poles, and yokes 3 and 4 are attached to the permanent magnets 1 and 2, respectively, to form a rotor.

18, 19.20 is a drive coil with a central angle of 60°, 21,
Magnetic sensing elements 22 and 23 are both attached to the substrate 5 and form a stator.

The rotor is inserted into the rotating shaft 32 and fixed with an appropriate gap.

After the stator is inserted into the gap between the rotors, it is screwed to a mounting device (for example, a printer) 33 through the mounting holes 30.

Numeral 35 is a groove cut from one side of the substrate 5 toward the center of attachment of the drive coil, which makes it possible to easily attach and detach the stator.

Permanent magnets 1 and 2 are small magnets 6, 7, 8, 9, 10, 11,
12, 14, 15, 16, and 17, and are fixed so that different poles face each other to form a magnetic structure parallel to the rotation axis 32K.

The magnetic circuit of the magnetic sensing element 22 inserted into the air gap of the rotor is formed by rotor magnet → air gap → magnetic sensing element → air gap → rotor magnet → yoke → rotating shaft → yoke → rotor magnet, as shown by dotted line 34. Ru.

FIG. 4 shows the arrangement of the drive coil and magnetically sensitive element.

The drive coils 18, 18, 20 are arranged at 100° around 19.

The central angle with the drive coil 18 to which a drive current is applied by the magnetically sensitive element 21 is 900, and the central angle with the drive coil 20 to which a drive current is applied by the magnetically sensitive element 23 is 1.
It is placed at 50°.

The rotational operation of the motor will be explained with reference to FIG. 3, which shows an electric circuit diagram, and FIG. 5, which shows the output voltage waveform of a magnetically sensitive element (Hall effect element) with a motor period T.

When the relationship between the rotor and the stator is in the state shown in FIG. 4, the switch 45 is turned on and the power source 44 is connected, and the magnetic sensing element (Hall effect element) 21 that can discriminate polarity is supplied with the magnetic flux generated by the rotor 7 (13). is added, an output signal is generated, and a drive current is applied to the drive coil 18 which is amplified by the transistor 41.

The currents 24 and 25 of the drive coil 18 in the direction of the arrow interact with the rotors 11 (17) and 6 (12), respectively, and
The rotor starts rotating in one direction.

Magnetic sensing element (Hall effect element) 2 is activated by the rotation of the rotor.
3 generates an output signal due to the magnetic flux of the rotor 6 (12), is amplified by the transistor 43, and a drive current is applied to the drive coil 20.

Currents 28 and 29 in the direction of the arrow in the drive coil 20 interact with the rotors 9 (15) and 10 (16), respectively, to maintain rotation of the rotors.

The output signal of the magnetic sensing element 21 stops, and eventually the magnetic sensing element (Hall effect element) 22 generates an output signal due to the magnetic flux of the rotor 10 (16), which is amplified by the transistor 42, and a driving current is applied to the driving coil 19. Ru.

Currents 26 and 27 in the direction of the arrow in the drive coil 19 interact with the rotors 8 (14) and 9 (15), respectively, to maintain rotation of the rotors.

Therefore, the self-starting property of starting to rotate as soon as the power is turned on, and the directionality of maintaining rotation in a predetermined direction are obtained.

As can be seen from the above explanation, the relative position of the magnetically sensitive element is 1000, that is, 10 from the center of each drive coil.
°It is in an inclined position.

If the positioning of the magnetic sensing element deviates, uneven rotation, dead points, etc. will occur, which will cause the performance of the non-contact motor to deteriorate.

In order to eliminate the above-described performance degradation, it is necessary to accurately fix the magnetic sensing element at a position inclined by lO0 from the center of the drive coil.

The present invention solves these problems most easily.

FIG. 6 shows a magnetically sensitive element mounting board of the present invention.

1B, (19.20) is the drive coil, 21, (22.2
3) is a magnetically sensitive element (Hall effect element), and 100 is a magnetically sensitive element mounting board.

By using the magnetically sensitive element mounting board of the present invention, positioning of the element becomes accurate and easy, and a contactless motor with good workability and higher performance can be provided.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of an embodiment of a non-contact motor, 1 and 2 are rotor magnets, 5 is a substrate, 1B, 19.20 is a drive coil, 21, 22.23 is a magnetic sensing element, and Fig. 2 is an exploded view of an embodiment of a non-contact motor. In the cross-sectional view, 1 and 2 are rotor magnets, 5 is a substrate, 18 is a drive coil, 2
2 is a magnetic sensing element, and FIG. 3 is an example of an electric circuit 18
．． 19.20 is a drive coil, 21, 22.23 are magnetic sensing elements, 41, 42.43 are transistors, FIG. 4 is a diagram showing the arrangement of the stator and rotor, 18.19.20 is a drive coil, 21, 22 .23 is a magnetic sensing element, and Fig. 5 is a schematic diagram showing the waveform of the output signal of the magnetic sensing element at the motor cycle. FIG. 6 is a diagram of a magnetically sensitive element substrate according to the present invention. 100 is a magnetically sensitive element substrate, 21, 22, and 23 are magnetically sensitive elements, and 18, 19, and 20 are drive coils.

Claims (1)

[Claims] 1 A rotor magnetized with six poles in the direction of the rotation axis, a fan-shaped drive coil with a central angle of 60° placed within the magnetic flux formed by the rotor, a board to which the drive coil is attached, and the state of the magnetic flux detected. In the non-contact motor configured by a magnetically sensitive element that controls the drive coil, the three drive coils/I/(F) are arranged at an angle of 100° with one drive coil at the center, and each drive coil A non-contact motor characterized in that a separate board on which the magnetic sensing element is provided is inserted and fixed in a coil at a position inclined at 10 degrees from the center of the drive coil.