JPH0617345U - Alternator stator without frame - Google Patents

Abstract

(57) [Abstract] [Purpose] In a stator of an AC machine without a frame, by improving the cooling effect by punching a specific number of air holes provided on the outer peripheral portion of the stator core, the AC machine can be made compact and lightweight. , It is intended to increase the output. [Structure] (a) The ratio of the number of air holes in the outer peripheral portion of a die-cut stator / rotor iron core silicon steel plate to the number of stator coil slots provided on the inner diameter side of the steel plate is [1 / N] (where n is an integer that is 12 ≧ n ≧ 2 and is divided by 2 or 3). (B) The steel plates are stacked in a predetermined length to form a stator core. (C) The stator iron core retainer is provided with air holes symmetrical to the iron core air holes, and the hole in the inner diameter part is formed slightly larger than the outer diameter of the stator core slot depth. (D) Two stator core retainers are used to fix the stator core to form a stator.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stator of an AC machine without a frame, in which a specific ventilation hole is provided near the outer circumference of a stator core.

[0002]

[Prior art]

 FIG. 6 shows a conventional stator core of an AC machine without a frame. In FIG. 6, reference numeral 1 denotes a thin silicon steel plate, and the thin silicon steel plate 1 has a wind hole 1a for cooling the stator by ventilation and a slot 1b for inserting the stator coil near the outer circumference (1d) of the steel plate. Is also provided, and a hole 1c for passing a stat bolt or the like may be provided if necessary. As described above, the thin silicon steel plate 1 forming the conventional stator core 2 has the number of holes 1a for cooling the stator by ventilation and the number of slots 1b for inserting the stator coil. The same number is provided at positions equidistant from the steel plate center O and at an angle β.

[0003]

[Problems to be solved by the device]

 However, as the number of air holes 1a through which the cooling air passes and the number of holes (1b) in the stator coil insertion slots are the same, as shown in Fig. 6, the number of air holes is very large and the size of the holes is large. There was a limit to the size, and only a small hole could be provided. Therefore, the amount of ventilation area (number of holes x hole size) for cooling the stator is limited, and a frameless commutator with a large output and a high temperature rise due to loss is miniaturized. When trying to increase the output by increasing the temperature, the stator's temperature rises too high due to the lack of the ventilation area of the holes, which made it impossible to reduce the size and weight appropriately.

The present invention has been devised in view of the above points, and an object of the present invention is to provide a frameless AC machine having a large output and a high temperature rise due to a loss, which is sufficient for a frameless AC machine. The purpose of this is to provide an inexpensive product per output as well as to reduce the amount of die-cutting cost as well as to reduce the size and weight by the ventilation cooling effect.

[0005]

[Means for Solving the Problems]

 In a frameless AC machine whose main elements are the stator, rotor, bracket and blower, (a) The stator core has the following structure. A specific number of air holes of the same shape and of a predetermined size are provided near the outer periphery of a die-cutting thin silicon steel plate in which the four corners of a square are cut, at an equal distance from the center of the steel plate. That is, the ratio of the number of holes to the number of slots for inserting stator coils on the inner diameter side of the steel plate is [1 / n] (where n is an integer divided by 2 or 3 when 12 ≧ n ≧ 2). Are provided, and thus less than the number of slots. Instead, make the hole as large as possible so that the size of the hole does not affect the magnetic circuit. For example, when a stator slot and a wind hole are processed at the same time by a notching machine, one slot for two slots or one slot for three stator slots is processed. The value of n is appropriately determined according to the type of AC machine. In addition, a punched silicon steel plate may be provided with a hole for attaching a stator core retainer if necessary. Next, the steel plates are stacked in a predetermined length to form a stator core.

(B) The stator core retainer has the following structure. The outer shape is almost the same as the outer shape of the stator core, and is slightly larger. The inner diameter hole is formed slightly larger than the diameter of the depth of the slot of the fixed iron core. The air holes are formed symmetrically with the air holes of the iron core. (C) Fix the stator core with two stator core retainers from both sides to form the stator. Also, in the case of an open-type AC machine without a frame, the cooling air passing through the bracket may pass through the air holes of the stator core, the air holes of the rotor, and the air gap between the stator and the rotor. However, it may be necessary to optimize the cooling distribution between the stator side and the rotor side. In general, the amount of distribution on the stator side will be small, so an appropriate amount of small size and light weight will be achieved by using a stator core retainer that adjusts the air holes provided in the stator core retainer.

[0007]

[Action]

 In an open-type AC machine without a frame, the cooling air from the blower is distributed through the bracket through the air holes in the stator core, the air holes in the rotor, and the air gap between the stator and rotor. It That is, the cooling air passing through the air holes of the stator core discharges the resistance heat generated from the fixed coil and the iron loss heat of the stator core to the atmosphere, and the cooling air passing through the rotor side is the resistance heat of the rotor and the rotor heat. Dissipate iron loss heat and partial heat loss of the stator into the atmosphere. In addition, by using a stator core retainer with an appropriately adjusted area of the air holes in the stator core retainer, the cooling distribution on the stator side and rotor side is optimized to improve cooling efficiency and reduce size and weight. To be

[0008]

【Example】

 Fig. 1 shows that four corners of a square are punched into a cut shape, and a thin silicon steel plate for a stator / rotor iron core and a silicon steel plate for a stator iron core are punched at the same time with air holes and slots on the inner diameter side. It is a front view showing a method. In thin silicon steel plates for stator cores in AC machines without various frames, the ratio of the number of specific air holes 1a to the number of slots (1b) is [1 / n] (where n is 12 ≧ n ≧ 12). 2 or is rectified by dividing by 3). In this embodiment, as shown in FIG. 1, a method of punching at a ratio of one air hole (n = 2) to two slots is shown. That is, a die with one air hole for two slots is used to punch air holes of the same shape and size at the same position (angle α) from the center O of the steel plate at the same time as the slot with a notching machine.

FIG. 2 is a perspective view of a stator core 2 in which the stator core steel plates punched as described above are stacked in a predetermined length, and FIG. 3 is a front view of the stator in this case. Yes, FIG. 4 is a perspective view of the stator in this case. The stamped steel plate is provided with a hole 1c. The hole 1c is a hole for mounting the stator core retainer 3. The stator core retainer 3 is substantially the same in outer shape as the stator core 2 and is formed slightly larger, and the hole at the center is formed slightly larger than the outer diameter of the slot of the stator core. Further, on its outer circumference, air holes 3a are symmetrically provided so as not to block the air holes 1a of the stator core. Next, the stator core retainer 3 fixes the stator core 2 from both sides to form a stator.

[0010] In an open-type AC machine without a frame, the cooling air passing through the inside of the bracket consists of the cooling air A passing through the air holes of the stator, the air holes 1f of the rotor, and the stator and the rotor. It is distributed to those that pass through the air gap, that is, it may be necessary to optimize the cooling distribution between the stator side and the rotor side. In general, since the distribution amount on the rotor side is small, a stator core retainer in which the air holes 3a provided in the stator core retainer are adjusted is used. In this embodiment, the stator core and the stator core retainer are fixedly fastened by the stat bolt 4 and the nut 5 through the hole 1c and the stator core retainer hole 3c.

FIG. 5 is a perspective view of a stator showing another embodiment in which the fixed iron core retainer 3 and the stator iron core 2 are fixed to each other. That is, the stator core 2 is provided with several concave grooves, the corresponding portions of the stator core retainer 3 are provided with grooves or holes, and the ribs 7 and 6 are inserted and welded to be integrated. .

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. The number of air holes in the stator is reduced to 1 / n of the number of slots (where n is an integer divided by 2 or 3 when 12 ≧ n ≧ 12), and instead the size of the air holes affects the magnetic circuit. By making a large hole in the non-exposed range, the amount of ventilation area (number of holes x hole size) for cooling the stator is increased compared to the conventional model, and there is no frame in the range where the output is large and the temperature rise due to loss is high. The stator of the AC machine can be cooled sufficiently. By adjusting the air holes in the stator core retainer, the cooling distribution on the stator side and rotor side can be optimized.

Since the notch punching die is used so that the air holes and the slots of the stator can be punched at the above ratio, the die cost can be reduced as compared with the blanking die. The heat generated by the stator and rotor can be discharged to the atmosphere by the cooling air from the blower that passes through the bracket, resulting in a reduction in size and weight and an increase in output, reducing the cost per output, and It is possible to provide products with a low unit price per output.

[Brief description of drawings]

[0014]

FIG. 1 is a front view showing a stamped thin silicon steel plate for a stator / rotor core and a method of simultaneously punching air holes and slots according to an embodiment of the present invention.

2 is a perspective view showing a laminated stator core of FIG. 1. FIG.

FIG. 3 is a front view of a stator according to an embodiment of the present invention.

FIG. 4 is a perspective view of a stator in which a stator core is attached with stat bolts and nuts by the stator core retainer having the air holes of the stator core retainer according to an embodiment of the present invention adjusted.

FIG. 5 is a perspective view of a stator of another embodiment in which a stator core retainer and a stator core are fixed by welding.

FIG. 6 is a perspective view showing a stator core of a conventional AC machine without a frame.

[0015]

[Explanation of symbols]

 1 Thin silicon steel plate 1a Air hole 1b Slot 1c Hole 1d Perimeter of thin silicon steel plate for stator core 1e Rotor shaft hole 1f Rotor air hole 2 Stator core 3 Stator core retainer 3a Air hole 3b Bracket mounting tap hole 3c Fixed iron core holding hole 4 Stat bolt 5 Nut 6 Rib 7 Rib O Center point A Cooling air

Claims (3)

[Scope of utility model registration request] 1. In a frameless AC machine having a stator, a rotor, a bracket and a blower as main elements, (a) the stator core (2) has the following structure. A specified number of air holes (1a) of the same shape and a predetermined size are provided equidistantly from the center (O) of the steel plate on the outer periphery (1d) side of the die-cutting thin silicon steel plate (1) in which the four corners of a square are cut. The steel plates are stacked in a predetermined length to form a stator core (2). (B) The stator core retainer (3) has the following structure. The outer shape is almost the same as the outer shape of the stator core (2) and formed slightly larger, and the inner diameter hole is formed slightly larger than the diameter of the depth (1b) of the stator core (2), and the air hole (3a) Is formed symmetrically with the air hole (1a) of the iron core. (C) Stator of the AC machine without a frame, which is fixed from both sides with the iron core retainer (3). 2. The specific number of air holes (1a) are slots (1a).
2. The fixing of an AC machine without a frame according to claim 1, wherein the number is set to [1 / n] of the number of b) (where n is an integer divided by 2 or 3 when 12 ≧ n ≧ 2). Child. 3. The stator core retainer (3) is provided with an air hole (3a).
The stator for an AC machine without a frame according to claim 1 or 2, wherein the ventilation area of the ventilation passage is less than the ventilation area of the air hole (1a) of the iron core.