JP2881695B2 - Rotor of 2 stator induction motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable-speed induction motor with improved torque characteristics and efficiency and easy speed control, or a rotor for an induction motor with improved starting characteristics.

[Conventional technology and its problems]

Methods for controlling the speed of the induction motor include changing the power supply frequency, changing the number of poles of the motor, changing the power supply voltage, and changing the secondary resistance of the spiral motor. However, in order to realize the above method, an expensive conversion device is required, another device is required for the conversion device, and even if the above method can be realized, a speed change is not smooth, Even if the shift is smooth, the efficiency is low and the torque is small in the low speed range. There was a problem.

To deal with the above problems, for example, Japanese Patent Application Laid-Open
-29005 discloses the technique, which comprises two sets of coaxially mounted rotor cores, two sets of stators, and a short circuit between a cage conductor and a cage conductor. This is a twin-iron cage type electric motor which is provided with a high-resistance element and shifts the phase between the stator windings by 180 ° at the time of starting and feeds power in phase during operation after starting. Further, another one proposed in JP-A-49-86807 is an asynchronous electric motor having a stator having a multilayer winding and a cage rotor.

However, in Japanese Patent Application Laid-Open No. 54-29005, although the startability is improved, it cannot be used as a power source for a load that requires stepless shifting.
Japanese Patent Application Laid-Open No. 49-86807 discloses a phase difference device in which the torque is small except when the phase angles of the two stators are in phase, and the operation is immediately stopped when a load is applied. Was not offered.

In order to solve the above many problems, the applicant of the present invention has proposed a method of diversifying torque by providing a phase shift of a rotating magnetic field between two stators according to Japanese Patent Application Laid-Open No. 62-26059. A variable speed induction motor with improved variable speed or startability can obtain high torque in a wide range of variable and wide speeds.

However, the variable speed induction motor of the applicant of the present invention has a structure in which two rotor cores are formed as an integral rotor and the two rotor cores do not face the two stators. From a configuration in which a plurality of rotor conductors provided in a communication manner are short-circuited and connected by a resistance material, two rotor cores are simultaneously rotated by mounting a plurality of rotor conductors on two rotor cores. A plurality of rotor conductors must be mounted on two rotor cores at the same time while being mounted on a shaft, and the manufacture of the rotor requires an increase in man-hours, making it difficult to commercialize this type of motor.

[Object of the invention]

In order to obtain a unique torque characteristic that cannot be achieved by the sum of the above-mentioned JP-A-54-29005 and JP-A-49-86807, the speed control range is wide and the speed control is continuously variable. And a variable speed induction motor having excellent torque characteristics and efficiency over the entire speed range from the starting point to the maximum rotation speed. 2605
No. 9 is proposed.

The present invention is to further improve the technology of the above proposed, in the manufacture of the rotor of the variable speed induction motor,
It is an object of the present invention to commercialize a variable speed induction motor that is more excellent in cost and performance in terms of cost and performance by reducing the number of manufacturing steps in consideration of the installation of the rotor conductor.

[Means for solving the problem]

In order to achieve the above technical object, the present invention relates to a rotor of an induction motor having a two-stator configuration, in which a plurality of conductors are provided on each of two rotor cores which are axially mounted at arbitrary intervals on a rotating shaft. A plurality of communicating conductors, which communicate the plurality of conductors between the rotor cores, are provided by symmetrically arranging two curved conductors different from the plurality of conductors and fixing one end thereof. And forming both ends of the plurality of communicating conductors in communication with the plurality of conductors of the rotor core in a communicating manner, and integrally connecting the fixed portions of the communicating conductors to each other with a resistance material by short-circuiting each other. Means to solve the problem.

[Action]

According to the present invention, the two rotor cores can be provided with a plurality of rotor conductors to separately form the rotor core portions, and can be integrally formed with the two rotor cores. The target rotor can be easily formed by connecting a plurality of communicating conductors in a communicating manner between the rotor cores with respect to the rotor conductors mounted on the respective separate rotor core portions.

〔Example〕

An embodiment will be described with reference to FIG. 1 and FIG. Reference numeral 1 in FIG. 1 denotes a two-stator induction motor according to the present invention, which has the following configuration.

Rotor portions 2 and 3 made of an iron core are mounted on a rotor shaft 4 at arbitrary intervals, and the rotor portion is formed by casting aluminum into a rotor core and forming a plurality of conductors 5 and one end thereof. The end portions 51 were formed by combining the short-circuit rings 6 and 7 and the plurality of conductors on the other side. Further, the rotor 8 is integrally connected between the rotor portions 2 and 3 by connecting a communication conductor 55 to the pair of conductors, that is, to the end portion 51 of the rotor portions 2 and 3 in a communicating manner. Formed. The communicating conductor 55 connected in a communicating manner between the rotor parts 2 and 3 is connected to a resistance material r.
Short-circuited via copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy and stainless steel.

The rotor portions 2 and 3 are provided with a plurality of ventilation drums 12 communicating with both side portions 10 and 11 of the rotor 8. Further, the stators 25, 31 are provided with a plurality of ventilation ducts 60 communicating with both sides of the stator.

Further, a plurality of resistance members r can be formed in the cooling body 13 as, for example, a zigzag shape or any other cooling stirrer.

Bearing plates 15 and 16 provided on both sides of a cylindrical machine frame 14 are integrally assembled on both sides by bolts 17, and cooling impellers 19 and 20 are mounted on both sides of the rotor 8. Both ends of the shaft 4 are supported by bearings 21, 21 fitted to bearing plates 15, 16, and the rotor 4 is rotatable.

As shown in FIGS. 1 and 2, a rotating stator 31 having windings 22 and 23 applied concentrically to rotor cores 2 and 3 and a second stator 25 face each other. Set up. A sliding bearing 26 is provided between the machine frame 14 and the rotating stator 31 so that the sliding bearing 26
Are fixed to the machine frame 14 by stop rings 28. The second stator 25 is a fixed stator fixed to the inner wall surface of the machine casing 14. A gear 33 is fitted on one outer peripheral surface of the rotation stator 31, and a driving gear 36 is mounted on a small forward / reverse rotation small motor 35 formed by a driving device 29 fixedly provided on the outer peripheral portion of the machine frame 14. Axle. A driving motor 36, a part of which is inserted into the machine frame 14 from the opening 37, and a gear 33 fitted to the rotating stator 31 are engaged with each other, and a small motor 35 having a switch formed as a driving device 29 is provided. , The rotation stator 30 is connected to a rotation stator 31 via a rotation mechanism 30 including a gear 33 and a driving gear 36.
A rotary stator 31 which is rotatable and is rotatable in relation to a second stator 25 fixed to the machine frame 14 is formed in a voltage phase shifter. Reference numeral 38 denotes a solenoid for controlling the movement of the projecting piece in and out, and the solenoid 38 is mounted on the machine frame 14 and the projecting piece is engaged with a gear 33 fitted on the rotating stator 31 so as to be freely mounted, thereby generating torque. This is a stopper for preventing the stator from rotating easily unless necessary, such as a reaction to the stator at the time.

A plurality of openings are opened, and the plurality of openings are formed in an arbitrary number of the blowing ports 65 and the discharging ports 66, and the discharging ports 66 are the suction ports.
Communicate with 74A.

The bearing plates 15 and 16 are provided with a plurality of ventilation holes 40.

The cooling device 73 is fixed to the machine frame 14, and the suction unit 74A of the cooling device 73 is connected to the inside of the machine frame 14. The second embodiment according to the present invention
The configuration of the stator induction motor has been described.

Next, an embodiment according to the present invention is shown in FIG. FIG. 3 is a side sectional view of a rotor portion including a resistance material r and a communication conductor 55. A communication conductor 55 having a curved portion is fixed to the end 51 of the rotor portions 2 and 3 so as to surround the support 75. Each communicating conductor
The rotor parts 2 and 3 to which 55 is fixed are mounted on the rotating shaft 4. Here, the fixation includes the brazing.

The resistance material r is connected and welded between adjacent communication conductors 55. At this time, the resistance material r is integrally formed so as to surround the communication conductor 55, and is welded (FIG. 4), or a plurality of resistance pieces are welded between the conductors. At this time, the resistance material r is a support.
It is formed concentrically with the rotating shaft 4 in contact with 75. Further, an insulating material is applied to a circumferential portion or the entire circumference of the support 75 facing the resistance material r.

The support 75 is mounted on a ring 76 fitted on the rotating shaft 4,
By caulking the side end of the ring 76 together with the stopper 77, the support 75 is formed integrally with the ring 76, and the ring 76 is
Fit between upper rotor parts. At this time, the ring 76 may be coated for insulation.

Incidentally, the communication conductor 55 is formed by the curved conductor 56 and the curved conductor 57. Curved conductor 56 with curved portion and curved conductor
57 is provided in a symmetrical shape and the joined portions are fixed by welding means such as spot welding. At this time, the curved conductors 56 and 57 are easy to process and weld if they are plate-shaped.

 The operation of the embodiment configured as described above is as follows.

The formation of an integral rotor by two rotor cores is facilitated by mounting the rotor portions 2 and 3 on the rotor shaft 4 and connecting the respective conductors, that is, the end portion 51, the curved conductor 56 and the curved conductor 57. Can be done. Further, the rotor portions 2 and 3 can be formed separately simultaneously with the rotor conductor.

〔The invention's effect〕

In the two-stator induction motor according to the present invention, a plurality of rotor conductors are integrally mounted on two rotor cores in order to obtain a high torque at the time of starting and from a low speed to a medium speed. However, according to the present invention, two rotor core portions including a rotor conductor are separately formed, and a conductor is connected between each of the two rotor cores. This facilitates the formation of the integral rotor.

From the above, the phase shift of the rotating magnetic field is provided between the two stators to diversify the torque, and to expand the applications of the induction motor of the type that improves the variable speed or the startability, thereby increasing the high torque. It can greatly contribute to any field that requires a variable speed motor.

[Brief description of the drawings]

1 is a two-stator induction motor according to the present invention, FIG. 2 is a front sectional view of FIG. 1, FIG. 3 is a detailed view of the first embodiment of the present invention, and FIG. FIG. 4 is a front sectional view of a resistance material portion. 1 ... 2 stator induction motor, 2, 3 ... rotor part, 4 ...
... rotor shaft, 5 ... rotor conductor, 6,7 ... short-circuit ring, 8 ...
... Rotator, 10,11 ... Both sides, 12 ... Cass body, 13 ... Cooling body, 14 ... Machine frame, 15,16 ... Bearing board, 17 ... Bolt, 19,20 ... Cooling Impeller, 21 ... bearing, 22, 23 ... winding, 25 ... second stator, 26 ... sliding bearing, 28 ... stop ring, 29 ... driving device, 30 ... rotating mechanism, 31 ……
Rotating stator, 33 ... Gear, 35 ... Small motor, 36 ...
Drive gear, 37 ... Opening, 38 ... Solenoid, 40 ...
Ventilation port, 51: End, 55: Communication conductor, 56: Curved conductor, 57: Curved conductor, 60: Ventilation cylinder, 65: Blow port, 66
…… Exhaust port, 70 …… Fan case, 71 …… Centrifugal fan,
72 …… Motor, 73 …… Cooling device, 74A …… Suction port, 74B
... exhaust port, 75 ... support, 76 ... ring, 77 ... stopper, r ... resistance material.

Claims (1)

(57) [Claims] 1. A rotor of an induction motor having a two-stator configuration, wherein a plurality of conductors are provided on each of two rotor cores which are axially mounted at an arbitrary interval on a rotating shaft, and A plurality of communicating conductors for communicating the plurality of conductors between the child cores are formed by symmetrically arranging two curved conductors different from the plurality of conductors and fixing one end thereof. The two ends of the conductor are fixedly connected to the plurality of conductors of the rotor core in a communicating manner, and the fixed portions of the communicating conductors are short-circuited to each other by a resistance material to be integrally formed.
Rotor of stator induction motor.