JPS6345825Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to rotating electric machines, and more specifically,
The present invention relates to improvements in slip ring-related devices in a wound induction motor having a slip ring.

(Prior Art) As shown in FIGS. 1 to 4, in a conventional rotating electric machine, particularly a wound induction motor, a rotor shaft, that is, an output shaft 2 is connected from one side of a wound induction motor main body 1.
was extended, and a stator coil terminal box 3 was attached to the side wall of the main body 1.

Furthermore, a series of devices including a rotor terminal box 4, a slip ring cover 5, an adapter 10, a gear box 7, and a handle 6 are attached to the other side of the main body 1, that is, on the opposite output side of the rotor shaft 2 of the rotating electric machine. There is. This rotor terminal box 4 is equipped with a lead wire for taking out current from the rotor winding through a slip ring 12 and a brush 15 incorporated inside a slip ring cover 5. Further, the adapter 10 serves to assemble the rotor terminal box 4, slip ring cover 5, and gear box 7 together and to attach them to the main body 1.

The movement of the shorting ring, which has an annular shorting contact or contact 18 disposed corresponding to the shorting contact 17 of the slip ring 12 for shorting and opening the secondary circuit, is carried out by a handle device mounted on the machine frame of the rotating electric machine. It is carried out by. This handle device includes a crankshaft 16 consisting of a vertical support shaft and a horizontal arm connected to its lower end. The gearbox 7 extends through the gearbox 7, and there are disposed therein a gear attached to the crankshaft 16, a small electric motor for operation, a gear train for transmitting the rotation of the electric motor to the gear, a limit switch, and the like. However, in FIG. 3, the gearbox 7 is omitted and the handle portion 6 is manually rotated.

The interior of the slip ring cover 5 incorporating means for shorting and opening the secondary circuit will be described in more detail with reference to FIGS. 3 and 4.

An output shaft 2 of the rotating electric machine extends inside the slip ring cover 5, and a slip ring 12 is attached to the terminal end of the output shaft. Each shorting contact 17 of this slip ring 12 is arranged and fixed coaxially with respect to the output shaft 2, and its contactor protrudes in the axial direction. Further, an annular shorting contact 18 disposed corresponding to the contact 17 to be coupled to the contact of the shorting contact 17 is attached to a side surface of a shorting ring 20 that is loosely fitted to the output shaft 2 and is slidable on the shaft. It is set in. A groove 21 is formed in the circumferential surface of the shorting ring 20.

A lever device that applies a direct force to the shorting ring 20 in order to slide it on the output shaft 2 is an inverted U-shaped lever 22 disposed straddling the shorting ring 20.
The lower end of each leg 23a, 23b is connected to a suitable support 2 fixed to the slip ring cover 5.
4 by a rod 25. Furthermore, in each of these leg portions 23a and 23b,
Rollers 26a and 26b are rotatably mounted opposite to each other at positions located on the axis in the horizontal direction of the output shaft 2, and these two rollers are connected to the above-mentioned short circuit ring 20.
It is engaged with the circumferential groove 21 at. Also, the upper part of the lever 22, that is, the two leg parts 23a, 23
A groove 28 is formed on the upper surface of the portion 27 connecting the portions b.

As mentioned above, in FIG. 3 in which the gearbox 7 is omitted, the slip ring cover 5 is
A crankshaft 16 is disposed in an opening 29 formed in a part of the housing of the adapter 10 that closes the open side of the housing, and an L-shaped support shaft is provided at the upper end of the support shaft of the shaft 16 that protrudes outward from the housing. The handle part 6 is fixed, and a protrusion 30 is provided on the lower surface of the tip of the other arm, and this protrusion 30 is attached to the upper part 27 of the lever 22.
It engages within the groove 28 at. These handle portion 6, crankshaft 16, and protrusion 30 collectively constitute a handle device that operates the lever device.

In a conventional rotating electrical machine that employs such a configuration, sliding of the shorting ring 20 on the shaft for performing the secondary current shorting operation is performed by rotating the handle portion 6, which is provided at the lower end of the crankshaft 16. The protrusion 30 slides laterally within the groove 28 of the lever 22 to pivot the lever 22. As a result, the rollers 26 provided on each leg of the lever 22
The shorting ring 20 having the outer circumferential groove 21 that engages with the rollers 26a and 26b is given a sliding force by the axial movement of the rollers 26a and 26b, and moves by a distance L on the output shaft 2, and the contact 18 of the shorting ring 20 and the shorting contact 17 of the slip ring 12 are connected.

At this time, the protrusion 30 rotated by the handle part 6 is moved by the lever 22
It makes a simple harmonic circular motion while engaging with the groove 28 of FIG.
During this time, the protrusion 30 starts to come into contact with the shorting contacts 17 and 18 near the position indicated by the reference numeral 30''.
Therefore, it receives a reaction force due to contact friction and pushing force. Therefore, the lever 22 requires a large axial force.

(Problems to be Solved by the Invention) However, in the conventional handle device, as shown in FIG. The protrusion 30 does not push the lever 22 between the centers of its legs, that is, on the vertical line that intersects between the lines connecting the rollers 26a and 26b, and the lever 22
This means that the point of force of action of the protrusion 30 on the roller 26a is shifted from the perpendicular line by a radius R toward the roller 26a. Therefore, the distances from the protrusion 30 on each of the rollers 26a and 26b of the lever 22, which are the points of application to the short circuit ring 20, are respectively 31a and 31.
As a result, the rotational force of the handle ends up being strongly applied to the roller 26a and weakly applied to the roller 26b, which acts extremely unevenly. Therefore, the force pushing the short-circuit ring 20 twists the short-circuit ring 20 with respect to the axial center line. This has been a major cause of the unsmooth sliding of the short-circuit ring.

The purpose of the present invention was to solve such conventional problems, and in order to short-circuit and open a secondary circuit, a sliding ring of a short-circuit ring having a short-circuit contact corresponding to a short-circuit contact of a slip ring is used. The object of the present invention is to provide a rotating electric machine that can smoothly perform the following operations.

(Means for Solving the Problems) In the rotating electric machine of the present invention, the protrusion provided on the crankshaft of the handle device engages with the lever device and presses the lever device to press the short circuit ring to the short circuit contact of the slip ring. When the connection is being made, the support shaft of the handle device is shifted from the axial position of the rotor shaft and attached to the machine frame of the rotating electric machine so that the protrusion engages the lever device near the axial position of the rotor shaft. I supported it.

(Function) According to the rotating electric machine of the present invention, since the crankshaft of the handle device is disposed offset from the vertical central axis of the output shaft, the protrusion of the handle device is located on the left and right sides at the position where the maximum pushing force is required against the short-circuit ring. The lever device is engaged with the lever device at an intermediate position between the engaging portions, that is, on the vertical central axis of the output shaft, and a moving force is applied to the lever device.

(Embodiments) Hereinafter, the rotating electrical machine of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings. In addition, throughout the drawings showing the embodiments of the present invention,
The same parts or corresponding parts as those of the conventional rotating electric machine shown in FIGS. 1 to 5 are given the same reference numerals, and the explanation thereof will be omitted.

A rotating electric machine according to an embodiment of the present invention is shown in FIGS. 6 and 7.

In order to eliminate the inconvenience of the short-circuit ring sliding smoothly on the shaft in the conventional rotating electric machine, the rotating electric machine of this embodiment has a vertical axis on the crankshaft 16 of the handle device, as shown in FIGS. 6 and 7. The support shaft is arranged to be shifted by a distance δ from the output shaft vertical center axis 32, so that both rollers 26a,
The space between 26b and 26b is almost equally divided internally (reference numeral 33 in Fig. 7).
a and 33b), and as a result, the pushing force of the short-circuit ring becomes almost equal on the left and right sides.
Therefore, the shorting ring can receive a large push-in force evenly from both sides of the shaft when opening and closing the shorting contact, and therefore can operate smoothly without twisting.

(Effect of the invention) As mentioned above, according to the rotating electric machine of the invention,
By arranging the center of the support shaft of the crankshaft of the handle device by a certain distance (approximately the length of the crankshaft arm) from the position on the output shaft center line, the short-circuit ring is pushed and the force acting on each roller of the lever is applied equally. As a result, the shorting ring is not twisted by unbalanced force on the left and right sides, and therefore the operation becomes smoother, the reliability of the shorting is improved, and the durability of the rollers is also improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional rotating electrical machine, Fig. 2 is a side view of the rotating electrical machine shown in Fig. 1, and Fig. 3 is a sectional view showing the inside of the slip ring cover in the conventional rotating electrical machine shown in Fig. 1. , FIG. 4 is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a diagram showing the relationship between the handle device and lever of the slip ring short-circuit part in the conventional rotating electric machine shown in FIGS. 3 and 4. 6 is a side view similar to FIG. 2 showing the rotating electrical machine according to the present invention, and FIG. 7 is a diagram showing the inside of the slip ring cover in the rotating electrical machine according to the present invention. A similar sectional view, FIG. 8, is a view similar to FIG. 5 showing the relative movement relationship between the handle device and the lever at the slip ring short-circuit portion of the rotating electric machine according to the present invention. DESCRIPTION OF SYMBOLS 1...Rotating electric machine main body, 2...Output shaft, ie, rotor shaft, 6...Handle, 12...Slip ring,
16...Crankshaft, 18...Short contact, 20
...Short ring, 22...Lever, 26a, 26b...
...Koro, 30...protrusion. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] a plurality of slip rings provided on the rotor shaft and connected to the rotor windings and provided with shorting contacts; and a plurality of slip rings provided on the rotor shaft so as to be slidable in the axial direction thereof; electrically connected to the shorting contact to short-circuit the plurality of slip rings when in a first position on the rotor shaft; a short-circuit ring that releases the short circuit when the short-circuit is in the position; and a short-circuit ring that spans the short-circuit ring at a distance from the outer periphery of the short-circuit ring, and has one end rotatably supported in the axial direction of the rotor shaft with this one end as a fulcrum. It is formed to be swingable, and
a lever device capable of engaging with the short circuit ring at two opposing locations sandwiching the rotating shaft; and a lever device that engages with a support shaft rotatably supported on a machine frame of a rotating electric machine and the other end of the lever device. a handle device having a crankshaft having a protrusion that makes a circular motion about the support shaft when the support shaft rotates, and by rotating the crankshaft of the handle device, the protrusion causes the short circuit. Rotation in which the ring is pressed and moved around the one end thereof, thereby moving the shorting ring to the first position or the second position to short-circuit or release the short-circuit of the slip ring. In the electric machine, when the protrusion presses the lever device to connect the shorting ring to at least the shorting contact of the slip ring, the protrusion presses the other end of the lever device in the vicinity of the axial position of the rotor shaft. A rotating electrical machine characterized in that the support shaft of the handle device is supported on a machine frame of the rotating electrical machine so as to be offset from the axial position of the rotor shaft so as to be engaged with each other.