JPS6311047A - Small induction motor - Google Patents

Abstract

PURPOSE:To facilitate winding work, to change the pole number easily and to reduce manufacturing cost, by a method wherein an iron plate punched in U-like form is laminated, and winding is applied to center portion thereof thereby a field stator is constituted. CONSTITUTION:Iron plates such as mild steel plate or silicon steel plate, punched in U-like form, are laminated, and a winding 2 is applied to center portion thereof so as to constitute one field stator 1. While an induction rotor 3 is inserted in an aperture of the field stator 1, the field stator 1 is arranged into a number of elements 1-1, 1-2,... 1-12 on the circumference. Each winding 2 is connected in three-phase connection and the rotating magnetic field is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a field stator for a motor, and is used in a small induction motor.

(Prior Art) The field stator of the conventional induction motor according to the present invention has a core made of a punched silicon steel plate, the cores are stacked to form the field stator, and three-phase winding is formed in the slot portion of the field stator. A device with a coil inserted is used.

(Problems to be Solved by the Invention) However, as the induction motor with a cylindrical outer circumferential field shape in which a coil is inserted into the throttle part of the field stator made of the laminated plate is miniaturized, It is structurally difficult to cool the heat generated by iron loss, copper loss, etc., and therefore self-heating reduces input/output efficiency and makes it impossible to obtain high output.

Furthermore, there is a problem in that the workability of inserting the winding wires is greatly reduced as the size of the device becomes smaller.

A technical object of the present invention is to provide a small, low-cost induction motor that has improved heat dissipation properties and has good winding workability.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
In a small induction motor consisting of a field stator and an induction rotor, iron plates made of mild steel plates or silicon steel plates punched into a U-shape are laminated, and a winding is applied to the center of the laminated iron plates to form one field. This small induction motor has a magnetic stator with induction rotors sandwiched between its openings, arranged in large numbers on the circumference, and each of the windings connected in three phases to generate a rotating magnetic field. .

(effect) The technical means works as follows.

Since the magnetic field stator made of laminated plates is arranged around the outer periphery of the induction rotor and is an open type, heat dissipation is extremely good. Furthermore, it is extremely easy to wind the coil around the U-shaped core, making it ideal for mass production.

(Example) Examples will be described below.

In Figures 1 to 3, 1 is a field stator type, and is arranged at 30° intervals on the outer circumference as shown in 1-1.1-2...1-12. (1 depending on the number of coils)
5° to 60° arrangement is also possible). Further, 2 is an excitation coil which is wound 36 times around the outer central part of the stator and connected to form a rotating magnetic field of two poles of each excitation coil.

Reference numeral 4 denotes a housing that fixes the shaft and bearing 6 that hold the field stator 1 and the induction rotor 3, and also positions them.

The field stator 1 and the excitation coil 2 are made by laminating 16 silicon steel plates (t=0.5 m) punched in a U-shape to reduce iron loss. The excitation coil 2 is wound in a predetermined direction by several tens of turns (36 turns in this embodiment) after forming an insulating coating on the field stator winding portion. The winding method is three-phase winding so as to form a rotating magnetic field, and FIG. 4 shows a two-pole winding method, and FIG. 5 shows a four-pole winding method (the 0 part shows the same direction winding). Since the magnetic flux generated in the excitation stator 1 flows as shown by the arrow P in Fig. 2, the effect of reducing iron loss by the laminated plate is large, and the windings are arranged on the outer periphery with the induction rotor 3 sandwiched between them. Because of this, it has great heat dissipation properties, and air is blown outside as a means of cooling.

It is easy to apply water cooling, etc. In addition, the solenoid-like winding method has less invalid mu when connecting, and reduces fl loss.

Figure 3 shows the structure of the induction rotor. 3 is the induction rotor main body, which is made of soft magnetic material such as soft silicon steel in this embodiment.
73i sintered soft magnetic material is used.

5 is a copper bar 5a as an induced current path and a copper ring 5b, which are short-circuited on both sides of the rotor, copper bar 5a (16 pieces on one side), copper rings 5b and 5c (2 pieces on one side).
It consists of The direction of the magnetic flux of the induction rotor 3 alternates in the thrust direction with respect to the shaft, and the induced current is in the same direction on both sides, so that torque in the same direction is generated. Also a copper bar.

In addition to inserting a copper ring, the same current path can also be formed by casting.

After the rotating shaft 7 is press-fitted into the induction rotor, the induction rotor is fixed by being inserted into the induction rotor opening via the bearing 6.

To describe the operation of the above configuration, when the coil 2 is energized and a rotating magnetic field is generated in the stator 1, a magnetic force is generated in the field stator 1 and the induction rotor 3 rotates. In this case, even if copper loss and iron loss occur, since the stator and coils are arranged on the outer periphery, heat dissipation is good and, therefore, highly efficient operation is possible.

〔Effect of the invention〕

The present invention has the following effects.

In other words, an iron plate (mild steel plate) punched in a U-shape.

The field stator has a structure of laminated silicon steel plates and winding in the center, so winding can be done easily and the number of poles can be changed very easily. Effective in reducing manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 (a) is a plan view of this embodiment, and Fig. 1 (b) is a plan view of the first embodiment.
A-A sectional view of figure (a), figure 2 (a) is a plan view of the stator, figure 2 (b) is a front view of the stator, figure 3 (a) is a plan view of the rotor, Figure 3 (B) is a sectional view taken along line B-B in Figure 3 (A), Figure 4 is a block diagram of a two-pole winding, and Figure 5 is a block diagram of a four-pole winding. - Field stator, 2... Excitation coil.

Claims (1)

[Claims] In a small induction motor consisting of a field stator and an induction rotor, steel plates punched in a U-shape are laminated and a winding is applied to the center to form one field stator. A small induction motor in which a large number of induction rotors are arranged around the circumference with the induction rotors sandwiched between the openings, and each of the windings is connected in three phases.