JPS5851765A - Motor - Google Patents

Abstract

PURPOSE:To obtain an efficient position detection signal with a simple structure by providing a magnetic converter and an armature on a magnetic material substrate and using the substrate as a stator substrate. CONSTITUTION:A magnetic material substrate 9 forming a stator substrate is disposed oppositely to a driving and position detecting rotor magnet 2 which is magnetically polarized in both directions, and an armature 4 for generating rotary force to the magnet and a magnetic converter 3 for detecting the position and rotating direction of the magnet are mounted on the surface opposed to the magnet 2 of the substrate 9. In this manner, since the substrate is used also as the stator substrate, efficient position detection signal and torque can be obtained with a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic substrate with the function of a magnetic yoke by mounting an armature and a magnetic transducer on the magnetic substrate. This relates to an electric motor that has been designed so that it can be obtained.

Conventionally, electric motors have been widely used in which when the positions of the rotor magnet and the magnetic transducer are detected, a driving current is supplied from K to the armature to rotate the rotor.

FIG. 1 shows an example of such a conventional electric motor. In FIG. 1, reference numeral 1 denotes a shaft that is the rotating shaft of the electric motor, 2 a rotor magnet for position detection and driving, and 3 a magnetic conversion element for position detection.

4 is an armature for rotationally driving the rotor magnet 2; 6 is a printed circuit board mainly made of paper phenol to which the magnetic transducer element 3 and armature 4 are mounted; 6 is an armature for holding the shaft 1 of the motor. 7 is a stator board for attaching the bearing θ, and 8 is a fixing spacer for attaching the printed circuit board 6 to the stator board 7.

In the position detection type electric motor configured in this way,
Position detection is performed between the planar multi-pole magnetized rotor magnet 2 and a magnetic transducer 3 such as a Hall element, and a position is detected at the output of the magnetic transducer 3 such as a Hall element in accordance with the rotational position of the rotor magnet 20. The table where the signal is generated, this position signal output is amplified and then the switching circuit (not shown)
A signal is sent to the lower part of the printed circuit board 6 as a driving signal.
By supplying the magnet to the driven armature 4, the planar multi-pole magnetized rotor magnet 2 is rotated.

However, such conventional electric motors have a complicated configuration and the output signal of the magnetic transducer 3 such as a Hall element is low, so a high gain amplifier is required at the subsequent stage.
In addition, in the rotational drive of an electric motor, the rotor magnet 2
Since the space gap between the magnetic loops of the armature 4 and the stator board 7 made of a magnetic material board such as an iron plate is wide, there is a drawback that the efficiency of rotational torque is poor.

The present invention provides a position detection type electric motor that solves these conventional drawbacks.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

In FIG. 2, parts having substantially the same functions as those in FIG.

Reference numeral 9 denotes a stator board composed of a printed circuit board having an insulating layer applied to at least the upper surface of a magnetic material board such as an iron plate, and a copper foil sheet pasted thereon. In the conventional generator shown in FIG. 1, a magnetic transducer element 3 for position detection is provided on the upper part of a printed circuit board 5 mainly made of paper foam, and a driving armature 4 is provided on the lower part. Furthermore, a stator substrate 7, which is a magnetic material substrate, was provided at the bottom, but in the embodiment shown in FIG.
By using a single magnetic copper foil printed circuit board and mounting the magnetic transducer 3 and armature 4 on the top of the stator board 9, the number of boards itself can be reduced, and the fixing spacer 8 can also be omitted. There is.

With this configuration, the number of parts is reduced, the assembly configuration becomes easy, and a thin electric motor is realized. 9 is arranged, this stator board 9 plays the role of a magnetic yoke, and a high output position detection signal is obtained from the magnetic transducer element 3, and the armature 4 is multi-pole magnetized for driving. The spatial gap between the magnetic loop between the rotor magnet 2 and the stator board 9 is 6...
−・ Since the torque is reduced, extremely efficient torque can be obtained.

Incidentally, in the above embodiment, 9 is constituted by one magnetic material copper foil printed circuit board, but it may be constituted by stacking a magnetic material substrate on the lower part of a paper phenol copper foil printed circuit board.

As described above, the present invention provides a magnetic transducer element and an armature on a magnetic material substrate, and this magnetic material substrate also serves as a stator substrate. Therefore, the present invention has a simple configuration and highly efficient position detection. The excellent effect of being able to obtain signals and at the same time obtaining high torque with high efficiency is obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional position detection type electric motor, and FIG. 2 is a sectional view of an electric motor according to an embodiment of the present invention. 1...Shaft, 2...Rotor magnet. 3... Magnetic conversion element, 4... Armature,
5... Printed circuit board, 6... Bearing,
7...Stator board, 8...Fixing spacer, also...6/-1- Stator board.

Claims (1)

[Claims] A magnetic material substrate constituting a stator substrate is disposed opposite to the rotor magnet for driving and position detection, which is magnetized with multiple poles in the plane direction, and the surface of the magnetic material substrate facing the rotor magnet is An electric motor characterized in that it is equipped with an armature that generates rotational force with respect to a rotor magnet, and a magnetic transducer element that detects the position and rotational direction of the rotor magnet.