JPS6026552Y2 - Non-contact motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contactless motor having a magnetic structure in which the direction of the magnetic flux of the rotor is mostly parallel to the axis of rotation.

An object of the present invention is to provide a highly reliable non-contact motor that is smaller in size, lower in price, and easier to manufacture.

Conventional non-contact motors have a magnetic structure in which the direction of the rotor's magnetic flux is parallel to the rotational axis of the rotor, and use a Hall effect element as a means for detecting the rotor's magnetic field. There were various drive systems including two-phase drive, four-phase drive with two Hall effect elements and four drive coils, and three-phase drive with three Hall effect elements and three drive coils.

In the case of two-phase drive, the unevenness of the drive torque and the dead center are reduced.
With phase drive, there are difficulties in overlapping the arrangement of the drive coil and the Hall effect element, and in properly positioning the drive coil and the Hall effect element at a predetermined installation location.

The present invention eliminates the drawbacks of the prior art.

FIG. 1 shows an embodiment of a non-contact motor according to the present invention.

In FIG. 1, X-X', Y-Y', and Z-z' are coordinate axes that are spatially orthogonal to each other at the origin 0.

The z-z' axis is the rotor rotation axis, and 1 and 2 are rotor magnets.
The rotors 1 and 2 are made up of permanent magnets with different magnetization directions for every r/3 and are attached so that different poles face each other, and the rotors 1 and 2 are combined to form a rotor.

3.4 is a yoke that serves both to protect the rotor magnet and to fix it by caulking.

A substrate 5 is inserted into the magnetic field of the rotor magnets 1 and 2. On the substrate 5, Hall effect elements 6 and 7 and drive coils 8 and 9 are arranged.

The Hall effect element 6 is installed on the X-X' axis, and y-y'
The driving coil 8, which is wound in layers and centered on the moving axis, is driven.

The Hall effect element 7 is installed at a position offset by α0 from the Hall effect element 6 installed on the The wound drive coil 9 is driven.

α0 has an angle of rotor magnet W/3 x 1/2=π/6.

FIG. 2 shows a circuit diagram of a non-contact motor driven in four phases by two drive coils according to the present invention.

11 has coils 11-a and 11-b wound together to form one driving coil, and 12 has coils 12-a and 12-b wound together to form one driving coil.
One drive coil is formed by overlapping the coils b.

Hall effect element 13.14 which is rotor magnetic field detection means
The semiconductor switching elements 15, 16, 17, and 18 that amplify and switch the Hall output voltage are turned on or off, thereby driving the lap-wound drive coil 11.12.

19 is a control circuit that stabilizes the rotational speed of the rotor.

FIG. 3 shows the phase state of each drive coil of the non-contact motor according to the present invention. Drive coils 11-a and 11- in FIG.
b has a phase difference of 180 electrical degrees, and similarly, drive coils 12-a and 12-b have a phase difference of 1800 electrical degrees.

The drive coils 11-a and 12-a have a phase difference of 90 degrees in electrical angle, so the contactless motor of the present invention is driven in four phases by the two drive coils 11 and 12.

By performing four-phase drive using two overlappingly wound drive coils as described above, it is possible to provide a non-contact motor with no torque unevenness or dead center.

Further, the Hall effect element, which is the drive coil/rotor magnetic field detection means, can be placed at an appropriate position on the same substrate.

Therefore, it is possible to provide a highly reliable non-contact motor that is less affected by the heat and magnetic field of the drive coil, is smaller in size, lower in price, and easier to manufacture.

Although the non-contact motor according to the present invention uses a Hall effect element as a rotor magnetic field detection means, other magnetic field conversion elements and
The present invention is also applicable to rotor position detection means such as transmission and reception of electric power, reception of light emission, etc.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the non-contact motor according to the present invention.
2 is a rotor magnet, 6 and 7 are Hall effect elements, and 8 and 9 are overlappingly wound drive coils, and the Hall effect elements 6 and 7 and drive coils 8 and 9 are arranged on the same substrate 5. Figure 2 shows the circuit edge of the non-contact motor according to the present invention.13.
Reference numeral 14 indicates a Hall effect element, reference numerals 15, 16, 17, and 18 indicate semiconductor switching elements of the amplifier circuit, and reference numerals 11 and 12 indicate overlappingly wound drive coils. Figure 3 shows the phase states of the drive coils of the non-contact motor of the present invention. 11 and 12 are coils 11-a and 11-b.
, 12-a, 12-s phase states are shown.

Claims (1)

[Scope of utility model registration request] A rotor in which rotor magnets 1 and 2, which are permanent magnets whose magnetization directions differ every π/3, are arranged with a gap between them so that different poles face each other, and a substrate 5 is arranged in a gap of 1°2 between the magnets of the rotor. , a first coil 11 embedded in the substrate 5 and disposed within the magnetic field of the rotor and having a phase difference of 180 degrees in electrical angle.
A first drive coil body 8 or 11.-a and a second coil 11-b wound together in an overlapping manner. A third coil 12-a and a fourth coil are embedded in the substrate 5 and are arranged with a phase difference of 90 degrees in electrical angle from the first drive coil body 8 or 11, and have a phase difference of 180 degrees in electrical angle. A second drive coil body 9 or 12, which is formed by overlapping windings of 12-b, is arranged at an angle of 900 with respect to the first drive coil body 8 or 11, and detects the state of the magnetic field of the rotor. 8 or 1
1, the first magnetic field detecting means 6 or 13 that drives the first magnetic field detecting means 6 or 13, and the arrangement angle with respect to the first magnetic field detecting means 6 or 13? r/6 and has an arrangement angle 9 with the second drive coil body 9 or 12.
00 and a second magnetic field detection means 7 or 14 for driving the second drive coil body 9 or 12, and the two drive coil bodies 8 and 9. Or a non-contact motor characterized by being driven in four phases by 11 and 12.