JPS6015427Y2 - Servo motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a servo motor that detects the rotational speed of a rotor by rooting and feeds the detected output to a speed control circuit for constant speed control.

In this type of conventional device, the rotor magnet for the generator and the stator for the generator are installed inside the motor case, and since the rotational output of the motor is changed in speed by a power transmission means, it is outside the motor case. A power transmission means is attached to the rotor shaft that protrudes from the rotor shaft.

In this way, in the conventional device, the rotor magnet for the generator and the power transmission means must be separately attached to the rotor shaft, which makes the installation work cumbersome and increases the overall axial length. It is necessary to magnetically shield the rotor magnet and the generator stator using a specially shaped shield body, which has the disadvantage of complicating the structure.

``The present invention has been devised in view of these points, and one embodiment of the present invention will be explained based on the drawings.

FIG. 1 shows a sectional view of the servo motor.

In this drawing, reference numeral 1 indicates a cylindrical body 2 which also serves as a motor case and a yoke, a bracket 3, and a flange 5 of a supporting unit 4.
Consisting of

The support body 4 has a sleeve 6, on the outer circumferential surface of which a circular permanent magnet 7 is attached, and in the central hole 8 of the sleeve 6 an integral bearing 9.9 is attached.

The support body 4 is inserted from the left side of the cylinder body 2 in the figure so that the sleeve 6 is placed inside the cylinder body 2, and is attached so that the flange 5 is positioned inward from the left end of the cylinder body 2-. The left end portion of the body 2 is an extension portion 11 that surrounds an axial end portion 10 of the motor case 1 on the outer surface side of the flange 5 .

The bracket 3 has a mount 13 for a brush 12, 12 on its inner surface and is attached to the right open end of the cylinder 2.

The rotor 14 is housed inside the motor case 1 formed in this way.

The rotor includes a cylindrical winding body 15, an end plate 16 attached to cover one end of the winding body, a rotor shaft 17 pivotally attached to the end plate, and a commutator 18 attached to the end plate 16. Consists of.

Before attaching the bracket 3 to the cylinder body 2, the rotor 14 is inserted into the motor case 1 so that the rotor shaft 17 is supported by the bearings 9, 9, and the bracket 3 is inserted so that the brushes 12, 12 are in sliding contact with the commutator 18. It is attached to the cylindrical body 2.

Next, reference numeral 1-9 denotes a pulley as a power transmission means, which is attached to the rotor shaft 17 protruding outward from the motor case 1. Drive with variable speed.

As shown in FIG. 2, the pulley 19 is provided with a generator rotor magnet portion 23 on an outer circumferential surface 21 located at the axial end portion 10 of the motor case 1 or on a surface 22 facing the seven flange 5.

The magnet portion is attached to the outer peripheral surface 21 or opposing surface 22 of the pulley 19.
Alternatively, the pulley 1 may be formed by molding a resin material containing magnetic powder, and the outer peripheral surface 21 or the opposing surface 22 may be magnetized.

Reference numeral 24 denotes a stator part for a generator, and the fixed part shown in the embodiment has a U-shaped cross section with a concave structure formed on the outer peripheral surface, as is clear from the partially cutaway perspective view shown in FIG. A generator coil 26 is wound around a resin bobbin 25, and upper and lower yoke plates 29 and 30 are provided with bent teeth 27 and 28 alternately arranged on the inner peripheral surface of the bobbin. Periphery 31
．． 32 is attached so as to come into contact with the inner circumferential surface of the extending portion 11 of the motor case 1 .

Next, FIG. 4 is a partial side view showing an embodiment of the present invention, with main parts cut away.

In this figure, a generator rotor magnet part 23 is provided on the opposing surface 22 of the pulley 19, and a retaining plate 33 attached to the extension part 11 of the motor case 1 is provided with a rotation speed of the rotor magnet part 23. A detection element 34 for detecting is attached, and the detection element constitutes the generator stator section 24.

As the detection element 34, a detection coil, a saturable magnetic core coil, a Hall element, a magnetic bottom resistance element, etc. can be used, and the detection element 34 may be directly attached to the flange 5 without providing the retaining plate 33.

FIG. 5 is a partial sectional view of the saturable magnetic core coil 35 attached to the flange 5, and shows the saturable magnetic core 37 around which the coil 36 is wound.
is fixed to the hole 38 of the flange 5.

Further, the detection element 34 may be a substrate 39 with printed wiring 40 as shown in FIG. 6, and the substrate 39 may be provided at the axial end portion 10 instead of the holding plate 33.

As described above, according to the present invention, the generator rotor magnet portion is attached to the surface of the power transmission means attached to the rotor shaft protruding outward from the motor case, which faces the end portion in the magnetic direction of the motor case. In addition, since the generator stator section is provided at the axial end portion of the motor case, the power transmission means and the generator rotor magnet section are integrated, and the installation work is simpler than that of conventional devices. The overall axial length can be reduced.

Further, since the motor case has an extending portion that surrounds the rotor magnet portion and the fixed portion, the generator can be magnetically shielded with a simple structure.

[Brief explanation of the drawing]

The drawings show a servo motor according to the present invention, FIG. 1 is a sectional view of the servo motor showing one embodiment, FIG. 2 is a perspective view of a pulley, and FIG. 3 is a partially cutaway view of a generator stator. A perspective view, FIG. 4 is a side view of the main parts of a servo motor showing another embodiment, FIG. 5 is a partial sectional view of a saturable magnetic core coil attached to a flange of a support, and FIG. 6 is a diagram showing printed wiring. FIG. DESCRIPTION OF SYMBOLS 1...Motor case, 17...Mountain-evening axis, 19...Power transmission means, 10...Axis direction end portion, 23...・Rotor magnet part for generator,
24... Stator section for generator, 11...
Extension.

Claims (1)

[Claims for Utility Model Registration] Attached to an axial end portion of a cylindrical motor case is a space surrounded by an extension of the motor case, and a rotor shaft that protrudes outward from the motor case through this space. A servo motor comprising: a power transmission means; a generator rotor magnet section provided on a surface of the transmission means located in the space; and a generator stator section provided in the space.