JPS596140Y2 - synchronous motor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a synchronous motor, and an object thereof is to provide a synchronous motor in which it is possible to visually determine whether or not the rotor is rotating at a synchronous speed.

Generally, with conventional motors, a mark is placed on a part of the rotor with paint etc. to check whether it is rotating at a synchronous speed or not, or the synchronous motor itself is not checked and is assembled as an element in a timer etc. After the engine was loaded, a malfunction of the synchronous motor was detected based on the operating status of the timer.

However, there is a problem in that it is very time-consuming to mark the mark with paint, etc., and is not suitable for mass production.Also, it is difficult to detect a malfunction of a synchronous motor from the operating state of a product that is incorporated as an element. There was a problem that required disassembling the motor and replacing it.

The present invention was developed in view of the problem of description, and is intended to improve the shortcomings.

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a stator which accommodates a coil in the inner cavity of a U-shaped yoke made of iron and has a shaft hole 1a in the center.

Reference numeral 2 denotes a thin disk-shaped magnet plate, and 3 a shaft integrally molded with a guide-shaped portion 4 at the center of the magnet plate and protruding therefrom, and these constitute a rotor 5.

Reference numeral 6 designates a plurality of groove-shaped mark portions formed radially on the oval portion 4.

Reference numeral 7 denotes a rotor cover made of transparent resin and shaped like a thin plate, and a lens portion 7a is formed in the center of the bottom surface of the rotor cover.

Next, the assembly of the synchronous motor of the present invention will be described.

The shaft 3 of the rotor 5 is inserted into the central shaft hole 1a of the stator 1 and is rotatably mounted.

The rotor 5 is housed within the rotor cover 7 and coupled to the stator 1.

Generally, synchronous motors are driven by commercial power.

Now, when the number of poles is P and the power supply frequency is f, the rotation speed N of the rotor 5 is always constant as follows.

Taking advantage of this characteristic of always rotating at a constant rotational speed, it is used in time-limiting devices such as timers.

Therefore, the most important characteristic of a synchronous motor is whether it rotates at a constant rotational speed, that is, whether it rotates in synchronization with the power supply frequency.

Now, when we rotate the synchronous motor and look at the mark grooves 6 from the outside, we see that when the rotor 1 rotates at a speed synchronized with the power supply frequency, the same number of grooves as the number of poles come to rest, as shown in Figure 3. It looks like that.

This is because the rotation of the periodic motor is synchronized with the flashing cycle of the fluorescent lamp, which is lit using a power source of the same frequency.

That is, the fluorescent lamp lights up most brightly when the mark groove 6a always corresponds to the same position due to rotation of the rotor.

It should be noted that the marking portion of the rotor of the synchronous motor of the present invention is not limited to a groove shaped portion of the guide-shaped portion.

As shown in FIG. 4, a protruding rib 6b may be formed in a radial shape from the outer peripheral edge of the guide mold part 4.

In either case, the shape is achieved all at once in a molding process in which the shaft is integrally molded onto a magnetic plate without special markings with paint or the like.

As described above, the synchronous motor of the present invention has a radial mark part for checking the synchronous speed on the shaft coupling part in the center of the magnet plate, and the mark part is visible from the outside of the transparent rotor cover. Since the synchronous speed of the synchronous motor can be checked, it is possible to save the trouble of marking each rotor surface with paint or the like. This can be confirmed simply by irradiating the cover with fluorescent light, which has the effect of making assembly and inspection extremely easy.

[Brief explanation of drawings]

Figure 1 is a sectional view of one embodiment of the synchronous motor of the present invention, Figure 2
The figure is a perspective view of the same embodiment, FIG. 3 is a plan view showing a state in which the rotor is rotating at a synchronous speed, and FIG. 4 is a perspective view of another embodiment of the rotor. 1...Stator, 1a...Shaft hole, 2...
... Magnet plate, 3 ... Shaft, 4 ... Die part, 5 ... Rotor, 6 ... Marker part,
6a... mark groove, 6b... rib, 7.
...Rotor cover, 7a...Lens section.

Claims (1)

[Scope of utility model registration request] A mark part for confirming the synchronous speed is formed on a certain shaped part for shaft coupling on the surface of the rotor, and the mark part is confirmed from the outside of the transparent rotor cover. synchronous motor.