JPS6020765A - commutatorless motor - Google Patents

Abstract

PURPOSE:To enhance the accuracy of the relative position between an armature winding and a detector of an encoder by mounting directly the detector by utilizing a supporting member secured to a stator core. CONSTITUTION:Iron plates are laminated as a stator core 16, a winding 10 is mounted to form an armature 11. A supporting member 6 is engaged at one end with a connector in the state that the core 16, a housing 9, an end bracket 4 and a rotor 13 are associated, and passed at the other end into an escape hole 5 formed at an end bracket 4, and projected to the outside of the bracket 4. The detector 7a of the encoder is secured by utilizing the supporting member 6, and the rotary member 7b is secured to the rotational shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a commutatorless motor, and more particularly to a mounting structure for a detection section of a rotor position detector.

[Background of the invention]

FIG. 1 shows a diagram of the principle of a commutatorless motor. Transistors T u, T v, Tw connected to a DC power source E.

Tu', Tv', and TV' are connected to a three-phase bridge, and the output end thereof is connected to the input end U, V, and WK of the synchronous motor. Rotor 13 of this synchronous motor &! A rotary member 71) fixed to a rotating shaft and having a symbol 71 is fixed to one end of the rotating shaft.

The output position signal of the detection unit 7a & 1 for detecting the sign of the rotating member is inputted to the gate control circuit C which is the conduction control means,
The output signal of this gate control circuit C is transmitted to the transistor T.
The voltage is applied to each gate of u-TW'. Then, the position of the rotor of the synchronous motor is detected by an encoder, and the output signal of this encoder sends a signal from the gate control circuit to the transistor Tu-TW', and turns on the transistor Tu-TV' one after another, thereby controlling the synchronous motor. It is what drives the.

To explain in more detail, the firing state of the transistor according to the position signal of the encoder is as shown in FIG. That is, when the horizontal axis represents time and the vertical axis represents the firing state of the transistor, the transformer Tv' transistor is Tu, Tw', Tv, Tu', Tw, 'J=j
The transistors in the upper arm and the transistors in the lower arm are fired simultaneously in this order.

Therefore, two of the three phases of the armature winding are energized, and this magnetic force and the magnetic force of the permanent magnets 14 of the rotor 13 are attracted to each other, causing the rotor to rotate.

Operation control of such a commutatorless motor cannot achieve highly accurate speed control unless the relative position between the winding arrangement of the armature and the rotor 13 is accurately detected by an encoder. As for the relative position of each component, since the rotor 13 and the rotary member 7b having the symbol are fixed to the same rotating shaft, the mutual positions in the rotational direction can be easily and highly accurately determined. However, there is a drawback that it is difficult to maintain a constant relative position between the winding position of the armature and the detecting section 7a of the encoder. In other words, positional deviation errors in the rotational directions between the armature and the housing, between the housing and the detection part mounting member, and between the detection part mounting member and the detection part are accumulated. At the final stage of assembling the encoder detection section into a commutatorless motor, the rotor is rotated by an external force, and the phase of the voltage induced in the armature winding and the phase of the position signal generated at the encoder detection section 7a are determined. The detection part 7a of the encoder was adjusted and fixed in the rotational direction so as to be appropriate.

In this way, conventionally, the detection unit 7a for the winding position of the armature is
This has the drawback that the adjustment work is extremely complicated and requires a large amount of adjustment man-hours.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure for mounting a detecting section of an encoder with a simple configuration and high positioning accuracy.

[Summary of the invention]

The present invention is characterized in that a non-commutated motor has an armature and a rotor, detects the relative position between the armature winding and the rotor using an encoder, and energizes the winding by a conduction control means. The detection portion of the encoder is positioned using a support member that is engaged with the armature.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 3 to 5. FIG. 3 is a cross-sectional view showing the main parts of a commutatorless motor according to an embodiment of the present invention, with the upper half cut away.

Figure 4 is a front view showing the iron plate in Figure 3, iron plate 1 is the winding 10
A plurality of grooves 2 and locking portions 3 are provided for insertion into the moat. The armature 11 includes windings 10 on a stator core 16 on which iron plates 1 are laminated.
It is configured by attaching. FIG. 5 is a front view of the end bracket 4 used in FIG. 3, in which an escape hole 5 for passing through the support member 6 is provided.

A support member 6, such as a pin, for positioning the detecting portion 7a of the encoder is locked to the locking portion 3. In Figure 3, 4
is an end bracket, 8 is a rotating shaft, 9 is a housing, 1
2 is a bearing, and 16 is a rotor, which has a permanent magnet 14 and constitutes a field 15.

7a is a detection section of an encoder, and 7b is a rotating member having a code. First, stator core 16.7z uzing 9. When the end bracket 4 and the rotor 16 are assembled, the support member 6 has one end passed through the locking part 3 and the other end passed through the escape hole 5 provided in the end bracket 4, and projects to the outside of the end bracket 4. . The detecting section 7a of the encoder is fixed using the support member 6, and the rotary member 7b having a symbol is fixed to the rotating shaft. Note that the rotating member 7
The symbol provided at °C is provided by an MR element, a photocell, or the like.

The detection unit 7a of the encoder detects the code of the rotating member 7b using a magnetic sensor, an optical sensor, or the like.

This detection signal allows the relative position of the winding 10 forming the armature 11 and the field 15 having the permanent magnet 14 to be detected.

The support member 6 for attaching the detection part 7a of the encoder is attached sufficiently outside to avoid the end of the winding 10, or
Alternatively, as shown in FIGS. 6 and 7, the support member 6 is bent so as to avoid the conductor ends. Further, the detecting section 7a of the encoder can be attached to the supporting member 6 using screws or the like as necessary.
It may be fixed to the end bracket 4 by using.

With this structure, the detecting section 7a of the encoder can be directly positioned in the rotational direction by the support member 6 locked to the stator core 16, so that the detection section 7a of the encoder can be directly positioned in the rotational direction. Housing 9 and end bracket 4. The accuracy of positioning the armature winding 1o and the detection part 7a is greatly improved compared to the conventional square structure in which positioning is performed through two members such as the end bracket 4 and the detection part 7a. That is, if the locking part 3 for attaching the support member 6 is provided in a specific positional relationship such that the phases of the induced voltages of one of the plurality of phase armature windings 1o and the detecting part 7a match, assembly is possible. Detector 7 at the final stage
This means that the number of man-hours required for adjusting the position of a can be significantly reduced.

Further, if the locking portion 3 provided in the stator core 16 is formed into a hole shape, it can be punched out simultaneously when punching out the groove 2 of the iron plate 1, so that the positional relationship between the armature winding 1o and the detection portion 7a becomes highly accurate. In addition, in the above embodiment, the encoder is attached to the end bracket 4.
Although the case where it is provided on the outside of the end bracket has been described, it can also be provided on the inside of the end bracket. Another embodiment of the present invention resides in that the material of the support member 6 is a material with low thermal conductivity, such as a solid wood plastic material.

In this way, heat transfer from the stator core 16 to the detecting section 7a is reduced, and the temperature rise of the detecting section 7a can be reduced, thereby preventing malfunctions and extending the life.

The shape of the rotating member 7b is not limited to the disk shape shown in FIG. 5, but may of course be cylindrical.

〔Effect of the invention〕

According to the present invention, since the detecting section of the encoder is directly attached to the stator core using a support member fixed to the stator core, the relative position accuracy between the armature winding and the detecting section is improved.

[Brief explanation of drawings]

FIG. 1 is a principle diagram explaining a commutatorless motor. FIG. 2 is an operation diagram showing the order of conduction by the conduction control means of FIG. 1; Third
The figure is a partial sectional view of a commutatorless motor showing an embodiment of the present invention. The fourth figure is a front view of the stator core in Figure 3. Figure 5 is the third
Front view of the end bracket shown in the figure. FIGS. 6 and 7 are side views showing other embodiments of support members. 4 is an end bracket, 6 is a support member, 7a is a detection part,
7b is a rotating member, 8 is a rotating shaft, 9 is a housing, 10 is a winding, 11 is an armature, 13 is a rotor, 14 is a permanent magnet. 6 Figure

Claims (1)

[Claims] 1. An encoder consisting of a rotating member having a sign and a stationary detection unit that detects the sign of the rotating member;
An armature that is located inside a housing and has a plurality of phase windings, and a rotor that is located inside this armature and has a permanent magnet that rotates together with the rotating member,
A commutatorless motor, wherein the detection section is attached to the armature by a support member that is engaged with the armature. 2. The commutatorless electric motor according to claim 1, wherein the support member is a thermally poor conductor such as stainless steel or plastic material. 3. The commutatorless motor according to claim 1, wherein the armature is provided with a groove into which the winding is inserted and a locking portion of the support member in a specific positional relationship.