JPH02214450A - Stator lead fixing structure for plural-stator induction motor - Google Patents

Abstract

PURPOSE:To reduce the deflecting amounts of conductors and to eliminate friction of leads with the end of a stator by securing the leads of a rotary stator to the bearing part of a support smaller than the inner diameter of the stator. CONSTITUTION:The leads 73 of a rotary stator 31 are secured to the outer surface of a bearing part 74 of a support 26 smaller than the inner diameter of the stator 31 through the vent hole 78 of the support 26, and further connected to the terminal box 75 of a frame 14. Thus, the movement of the leads 73 at the part 74 is shorter than that of a winding 22 on the stator. Accordingly, in terms of a distance from the center of the box 75 to the winding 22 and a distance to the part 74, the distance to the part 74 is shorter in variation before and after rotation, the deflecting amount is small, and the support 26 can be rotated. Thus, since the friction of the leads with the end of the stator is eliminated, the conductors are not damaged, and stable rotation of the rotary stator and stable variation in the speed can be performed for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a variable speed induction motor, and more particularly, to a variable speed induction motor. A voltage phase shift that causes a phase difference between a voltage induced in a rotor conductor portion facing one of the stators and a voltage induced in a corresponding rotor conductor portion facing the other stator. The present invention relates to a stator lead wire fixing structure for a so-called multi-stator induction motor, which has a device and can change the rotation speed and generated torque of a rotor by adjusting a voltage phase shift device.

[Conventional technology]

Methods for controlling the speed of an induction motor include changing the power supply frequency, changing the number of poles of the windings on the stator, and controlling the -order voltage. In addition, special public service
As described in Publication No. 57, the stator is divided into two sets, a fixed stator and a movable stator, each with the same winding and connected to the same power supply, and the rotor is also divided into two sets, and the rotor is divided into two sets, a fixed stator and a movable stator. The conductors are connected at the center by a separate conductor with a wide width, and at both ends by a short-circuit ring. A different-phase current is generated in the same conductor, so that the current of the sum of the two vectors passes through the rotor conductor as a secondary current,
A variable speed induction motor is one in which the speed of the motor can be arbitrarily varied, and the stator is a movable stator and a fixed stator, or two stators are used as disclosed in Japanese Utility Model Application No. 60-7668. In a structure in which the speed of the motor is varied by rotating movable stators in opposite directions, the lead wire has a flexible portion that allows rotation of the stator to rotate the stator. It was necessary to provide many.

[Problem to be solved by the invention]

There are many known examples of ways to help the rotation of the stator by adding deflection to the lead wires of the stator, but in practice, conductors that are not fixed in any way are deflected and attached to a rotating body, especially within the same frame as the rotor. It is very dangerous to exist, and furthermore, the contact area between the stator core end face and the stator lead wire will rub against each other every time the stator rotates, so it is necessary to take measures to prevent wear, including heat resistance. I needed it. Furthermore, due to the rotation, fatigue is inevitably accumulated in the lead wire repeatedly, and its lifespan is short.

[Means to solve the problem]

A plurality of rotor conductors are mounted in a continuous manner on a plurality of rotor cores that are fixed at regular intervals to a rotating shaft that is supported by a bearing that is fitted in a bearing plate that is fixed to the machine frame of an electrical machine. an integral rotor in which the rotor conductor is short-circuited between the plurality of rotor cores by a resistive material; and a plurality of stators arranged in parallel on the inner periphery of the machine frame, and at least one stator among the plurality of stators is formed into a rotating stator that rotates concentrically with the rotation axis. In a multi-stator induction motor, the lead wire of the rotary stator is fixed at a position smaller than the inner diameter of the stator so as to rotate concentrically with the rotary stator. It was used as a means.

The variable speed induction motor of the present invention can be formed into either a single-phase or three-phase type, and the rotor can have a rotor type such as a normal squirrel cage type, a double squirrel cage type, a deep groove cage type, a special squirrel cage type two-wound type, etc. It can be applied to any type of conductor, and the conductor used in the explanation of the present invention refers to a conductor installed in a squirrel cage rotor core,
and the windings wound around the wire-wound rotor core.

[For production]

The effects of the present invention are as follows. By fixing the lead wire of the rotating stator on a circumference that is smaller than the inner diameter of the stator and concentric with the rotating shaft, the lead wire of the rotating stator has minimal deflection, and since the lead wire is fixed, it is fixed. The sliding contact between the lead wire and the end of the stator due to the rotation of the child is eliminated, and the friction of the stator conductor is eliminated. In other words, the formula for determining the length of the circumference is Circumference = 2πr, and the smaller the r = radius, the shorter the circumference. Therefore, in rotation at any angle, the smaller the r - radius, the shorter the radius. The distance between movements of arbitrary points on the circumference becomes smaller, and the deflection of the lead line due to rotation becomes smaller.

〔Example〕

An embodiment will be described with reference to FIGS. 1 to 4.

Reference numeral 1 in FIG. 1 is a variable speed induction motor according to the present invention, and the induction motor has the following configuration.

A rotor portion 2.3 consisting of an iron core is mounted on a rotor shaft 4 at an arbitrary interval, and the rotor portion is formed by casting aluminum into the rotor core and having a plurality of conductors 5 and one end thereof. An end portion 51 was formed by combining the short circuit rings 6 and 7 and the plurality of conductors on the other side. Furthermore, the rotor 8 connects in communication between the rotor parts 2.3 a separate conductor 55 with a bend to the set of conductors, ie to the ends 51 of the rotor parts 2, 3. By doing so, it is formed integrally. The conductor 55 connected in communication between the rotor parts 2 and 3
A resistive material r...for example, copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy, and stainless steel is used to connect and weld adjacent separate conductors at the curved portion.

At this time, the resistive material r surrounds the separate conductor 55 (by welding an integrally formed piece, or by welding a plurality of resistive pieces between separate conductors).

Further, the resistance material r extending over the curved portion is provided with a notch that starts from the center of the rotating shaft 4 and extends outward from the rotor. Further, the plurality of resistive materials r can be formed in the cooling effecting body 13, for example, in a zigzag shape or as a cooling agitator in any shape thereof.

Furthermore, a plurality of ventilation passages 60 are provided on the outer periphery of the stator 25, 31, which communicate with both sides of the stator, and a ventilation passage 61 is provided between the outer periphery of the stator and the inner periphery of the machine frame.

Bearing discs 15 and 16 provided on both sides of the cylindrical machine frame 14 are integrally assembled to both sides with bolts 17, cooling impellers 19 and 20 are attached to both sides of the rotor 8, and the rotor Both ends of the shaft 4 are supported by bearings 21.21 fitted in bearing discs 15.16, and the rotor 4 is rotatable.

As shown in FIGS. 1 and 2, a rotary stator 31 having a winding 22.23 on its outer side concentrically with respect to the rotor core 2.3 and a second stator 25 are arranged facing each other. Set up The second stator 25 is a fixed stator fixed to the inner wall surface of the machine frame 14. A drive gear 36 is pivotally attached to a small motor 35 for forward and reverse rotation, which is formed by a drive device 29 fixed to the outer periphery of the machine frame 14. A drive gear 36 partially inserted into the machine frame 14 through an opening 37 is engaged with a gear 33 threaded on the support of the rotary stator 31, and a switch is provided to form a drive H position 29. A small motor 35 is connected to a rotary stator 31 via a rotary mechanism 30 consisting of a gear 33 and a worm gear 36, and the rotary stator 31 is rotatable.
A rotary stator 31, which is rotatable in relation to a second stator 25 fixed to the voltage phase shifter 4, is installed in the voltage phase shift device. A plurality of ventilation holes 40... are bored in the bearing discs 15, 16.

A cooling device 83 is connected to the exhaust port 66 opened in the machine frame, and the cooling device 83 is connected to the suction port 84A by rotation of a centrifugal fan 81 fixed to the rotating shaft of a motor 82 fixed to the fan case 83. The air is sucked in and exhausted from the exhaust port 84B.

In addition, the stator winding 23 wound around each stator 25.31
．． 22 may be connected to the power source either in series or in parallel. In addition, although a voltage phase shifting device using a rotating mechanism is shown, a combination of purely electrical means such as a phase shifter that switches the connection of the stator winding and a rotating mechanism may also be used. . The bearing 27 is a generally used ball bearing or 0-roller bearing, and no special bearing is required. In addition, although this embodiment uses a cantilever support method using bearings, the rotating stator is A bearing (not shown) for supporting the support body may be additionally provided on the outer circumferential surface of the machine frame or on the inner surface of the machine frame facing thereto.

Furthermore, this bearing is also based on a general bearing and its method of use in the same manner as described above.

Further, in detail with reference to FIG. 3, the machine frame 14 and the bearing plate 15
As a result, a sliding groove 70 is formed concentrically with the rotating shaft 4 on the inner periphery of the machine frame. This sliding groove 70 is fixed with bolts 17 in a gap between the flange portion of the bearing plate 15 and the end face of the machine frame 14, where it can slide against the sliding plate 28.

On the other hand, on both sides of the sliding part 28, one side is connected to the sliding groove of the machine frame 14.
The other end is slid into the sliding groove of the bearing board 15. At this time, it is preferable to treat the sliding grooves 70 and the sliding surfaces of the Ma portion 28 with Teflon or the like.

By the way, in this embodiment, a plurality of sliding members 71 are interposed on any circumference of the sliding portion 28 concentric with the rotating shaft 4, that is, at any position on the sliding surface, to enable smoother rotation. method is taken.

For example, a plate-shaped sliding material (tetrafluoride resin material) may be fixed to the sliding movement, but here a method is shown in which the sliding material 71 is fixed to an arbitrary position in the sliding movement and is fixed to the sliding movement. Here, FIG. 4 shows only the support seen from the left direction in FIG. 1, and shows the details of the sliding material 71 being penetrated on an arbitrary circumference of the sliding movement 28.

The above does not require the trouble of coating the entire sliding surface or fixing the sliding material to the entire sliding surface, and the sliding material 71 that has penetrated can be used at the same time when the machine frame 14 and the bearing plate 15 are fixed with the bolts 17. It will be caught in the sliding groove.

Further, the gear 33 described above is threaded on the circumferential surface of the sliding portion 28, and the engagement between the gear 33, whose thrust direction is fixed to the sliding portion, and the gear 36 can realize stable driving. It is something.

Further, a ventilation lower 8 is opened in the support body 26.

In the above configuration, the rotary stator 31 supported by the rotatable support 26 which is formed concentrically with the rotor shaft 4 by the bearing 27 is adjusted and set by the small motor 35 of the drive device 29. .

The rotation of the rotary stator 31 causes a phase shift in the rotating magnetic field generated between the rotor and stator, and the voltage induced in the rotor conductor is controlled to increase or decrease, thereby increasing the rotation speed of the rotor. Can be changed arbitrarily. When the rotary stator 31 is further rotated, the conductor 55 installed in communication between the rotors 2 and 3
Since J3 and J5 have a structure in which they are short-circuited and connected by the resistive material r, a current flows through the resistive material r due to the phase difference, and the resistance of the rotor conductor 5 increases, generating a large torque. Can be done.

Next, one embodiment of the present invention is shown in FIG.

The lead line 73 of the rotating stator 31 passes through the ventilation lower 8 which is opened in the support body 26, and is fixed to the outer periphery of the bearing portion 74 of the support body 26, which is smaller than the inner radius of the stator 31, by a fixing means 77, and further It is connected to the terminal box 75 on the outer periphery of the machine frame through a lower wiring installed in the machine frame. At this time, the bearing portion 74
The lead wire 73 between the lower wiring and the lower wiring is provided with a slight flexure to allow rotation of the bearing portion 74 of the support body 26.

In this example, the rotary stator was configured to rotate concentrically with the rotor using a support provided on the side of the stator, but there is a sliding bearing between the outer periphery of the stator and the inner periphery of the machine frame. In this case, a support body is provided from the rotation stator as close as possible to the rotation axis, and the lead wire is fixed to this support body near the rotation axis, which is smaller than the inner radius of the stator. By doing so, the same effects as in the above embodiment can be obtained.

Next, the operation of this embodiment will be explained. According to this embodiment, since the lead wire 73 is fixed to the bearing portion 74 of the support body 26 whose inner radius is smaller than the inner radius of the rotating stator 31, for example, when the lead wire 73 is rotated by 45 degrees in mechanical angle, it is fixed to the bearing portion 74. The amount of movement of the lead wire on the circumference of the bearing portion around the rotating shaft 4 of the rotating stator is the amount of movement of the winding portion (22) on the rotating stator around the rotating shaft 4 of the rotating stator. Therefore, the terminal box 75 is the center. Regarding the distance to the winding part code 22 and the distance to the bearing part 74, the amount of change in the distance before and after rotation is that the amount of change in the distance to the bearing part 74 is small, and the amount of deflection is minute. The support can be rotated.

〔effect〕

According to the present invention, within the same machine frame including the rotating part,
The deflection of the conductor is minimal, and there is no sliding contact between the stator end and the lead wire, so there is no damage to the conductor, and stable rotation of the rotating stator and stable speed variation are possible. This is possible over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a variable speed induction motor according to the present invention, FIG. 2 is a front sectional view taken along line A-A of the variable speed induction motor of FIG. 1, and FIG. 3 is a detailed view of a fixing part of a lead wire. FIG. 4 is a detailed view of only the support body seen from the left side of FIG. 1. 1... variable speed induction motor, 2.3... rotor part,
4... Rotor shaft, 5... Rotor conductor, 6, 7...
Short circuit ring, 8... Rotor, 12... Passage body, 13...
- Cooling body, 14... Machine frame, 15.16... Bearing plate, 17... Bolt, 19.20... Cooling impeller,
21...Bearing, 22.23...Winding, 25...2nd @J constant, 26...Support, 28...Sliding part, 2
9... Drive device, 30... Rotating mechanism, 31... Rotating stator, 33... Gear, 35... Small motor,
36... Worm gear, 37... Opening, 38...
・Solenoid, 40... Ventilation port, 51... End, 5
5... Separate conductor with curved portion, 60.61...
Ventilation duct, 63. 64... Opening, 65... Ventilation duct,
66...Exhaust port, 70...Sliding groove, 71...Sliding material, 73...Leading line, 74...Bearing part, 75
...Terminal box, 76... Wiring port, 77... Fixing means, 78... Ventilation port, 80... Fan case, 81...
...Centrifugal fan, 82...Motor, 83...Cooling device, 84A...Suction port, 84B...Exhaust port, r...
・Resistance material. Diagram

Claims (2)

[Claims] (1) A plurality of rotor conductors are mounted on a plurality of rotor cores that are fixed at regular intervals to a rotating shaft that is supported by a bearing that is fitted into a bearing plate that is fixed to the machine frame of an electrical machine. An integrated rotor is installed in communication and the rotor conductor is short-circuited between the plurality of rotor cores by a resistive material, and the rotor cores of the rotor are opposed to each other, A rotary fixing device, comprising: a plurality of stators arranged in parallel on the inner periphery of the machine frame concentrically with the child; and at least one stator among the plurality of stators is rotated concentrically with a rotating shaft. In the multi-stator induction motor formed in the rotary stator, the lead wire of the rotary stator is fixed at a position smaller than the inner diameter of the stator so as to rotate concentrically with the rotary stator. Stator lead wire fixing structure for multiple stator induction motors. (2) The rotary stator has a support attached to a side different from that between the rotor cores, and the support is attached to the rotation shaft via a bearing and is formed concentrically with the rotation shaft. The stator lead wire fixing structure for a multi-stator induction motor according to claim 1, wherein the lead wire of the rotating stator is fixed to a position of the support body that is smaller than the inner diameter of the stator.