JPS6026546Y2 - Flat motor with speed detector - Google Patents

Description

[Detailed description of the invention] This invention consists of an armature made by resin-molding a plurality of flattened coils, a speed detector rotor fixed to the armature, and a sensor fixed to a bracket. This invention relates to a flat motor with a speed detector configured by the following.

Conventionally, this type of motor has a speed detector B provided outside the motor body A, as shown in FIG. It is composed of a rotating disk 1' made of a magnet, and a sensor 2' made of a Hall element 2.

However, in this configuration, the speed detector is exposed outside the motor body, and is greatly affected by external noise. Also, since a space is required for the speed detector, the motor size becomes large.

This invention fundamentally solves the above-mentioned conventional problems.
A thin design that does not increase the size of the motor or require space in the longitudinal direction for the speed detector, ensuring a dedicated space for the speed detector, and by providing the speed detector inside the motor, it is not affected by external noise. The present invention aims to provide a flat motor with a speed detector.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the figure, reference numerals 1, 2, and 3 denote a bracket A, a bracket B, and a housing cover, each of which is made of a magnetic material, and a bracket A1 is provided with a donut-shaped motor field magnet 4 that is multipole magnetized in the thrust direction. and bracket B
An armature 5 is provided in the gap between the two.

The armature 5 has a plurality of armature coils connected to a commutator 6, is covered with resin, is press-fitted onto the motor shaft 7, and is held on the bracket A1 and housing cover 3 by bearings 8.9. has been done.

10 is a rotor for a speed detector, which is radially multipole magnetized;
It is attached to the outer periphery of a boss portion integrally formed with the armature located in the connection space between the armature 5 and the commutator 6.

A brush holder 11 is equipped with a carphone brush, a brush spring, etc., and is fixed to the bracket B2 via a brush holder plate 12 with the carbon brush in contact with the commutator 6.

A sensor 13 is composed of a Hall element, and is fixed to the bracket B2 at a position where it does not overlap with the brush holder 11 in the thrust direction, with an arbitrary gap between the sensor and the speed detector rotor.

The present invention is constructed as described above, and includes an armature 5 in which a motor field magnet 4 and a speed detector rotor 10 radially magnetized with multiple poles with an arbitrary gap are attached to a bracket A1.
, and then attach bracket B2. A sensor 13 is fixed to the brush holder 11 and detects changes in the magnetic flux of the speed detector rotor 10 while rotating the armature 5 by applying current from the carphone brush of the brush holder 11 to the output of the sensor 13. You can fix it in the best position while checking the signal.

As described above, assembly can be performed while checking the output signal of the sensor, and there are no obstacles around the sensor, making assembly easy.

Furthermore, in contrast to the conventional method of attaching the rotation speed detector section to the outside of the motor, the present invention attaches the detector section on the rotor side between the connections to the armature, and attaches a brush retainer to the fixed sensor. Since it is fixed in the remaining blank space, the dimensions in the thrust direction are small, and the housing cover is made of magnetic material, so it is not affected by external noise.
A flat motor that is thin and has a highly accurate rotation detector with low external noise distortion may be provided.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional flat motor with a speed detector.
FIG. 2 is a longitudinal cross-sectional view of a flat motor with a speed detector according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line II in FIG. 2. 1... Bracket A, 2... Bracket B, 4... Field magnet, 5... Armature, 6... Rectifier child, 10... rotor for speed detector, 11... brush holder, 13...
·····sensor

Claims (1)

[Scope of utility model registration request] In flat motors, where the electric machine is made up of multiple coils molded into a flat shape, it is located in the connection space between the armature coil and commutator and is integrated into the armature coaxial with the motor shaft. A speed detector rotor is provided on the outer periphery of the formed boss portion, the armature coil is provided between the bracket A having the field magnet and the opposing bracket B, and the armature coil is provided on the commutator side of the bracket B. A housing cover equipped with a sensor for detecting a change in the output of the speed detector rotor and a brush that makes sliding contact with the commutator so as not to overlap in the thrust direction, and a bearing that supports the motor shaft is attached to the bracket B. A flat motor with a speed detector fixed to the