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Rotating electrical machine consists of a stator, rotor and the air gap between them. Stator and rotor has windings. The rotor is installed into the stem, and the stem connects to the motor and any other loads. The windings are there to carry the electrical current that generates magnetic fields for the electrical load.

The closed loops for voltages can be generated there. A distinction can be made by the types of windings. The current can operate in the rotating machine for magnetic field gener a tion — this current is called magnetising. This type of winding is called field winding.


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The current is low power DC, and the windings can also carry the load current, and will be called A rmature. In DC and AC machines, windings that carry magnetising current and load current are different.


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  • Rotating Electrical Machines?

However, in some machines the same windings can carry the load and magnetising currents — this happens in induction motors. This winding is called the primary winding. The output winding is the secondary winding. When t alking about energy conversion , electric machines can be classified in the following way:. In order for the rotating machine to turn and generate electrical currents, the permanent magnets are used, as is the AC and DC input currents.

The magnetic field creates the torque in the electric motor and the electromagnetic laws help the generator to create electric current in the magnetic field.

Special Issue "Advances in Rotating Electric Machines"

There are two fields that are generated — in the stator and rotor. R otating machines are energy conversion machines that are characterised with efficiency and energy losses. The g enerator and rotor may be characterised with different types of losses when the direct current passes through. The losses in rotating machines are:. The movable jig part 52 has a holding portion that supports upper and lower conductor portions 32 C of the intermediate coil 3 B. The movable jig part 52 can pivot with respect to the base jig part 51 by a pivot shaft portion and can slide with respect to the base jig part 51 by a linear guide.

The base jig part 51 has two guide rails guide grooves that form a path X in which the intermediate coil 3 B moves when being placed on the tooth 21 of the stator core 2. The movable jig part 52 has two rollers that are placed in the two guide rails In the first to fourth insertion steps of the manufacturing method, when being slid by the linear guide, the movable jig part 52 pivots about the pivot shaft portion and the two rollers move along the two guide rails , whereby the holding portion of the movable jig part 52 can be moved along the path X in which the intermediate coil 3 B moves.

The intermediate coil 3 B can be placed on the tooth 21 by the first to fourth insertion steps.

What is rotating electric machine

In a conventional assembly jig, after a concentrated winding coil is made to face a tooth in a tilted manner, the coil is placed on the tooth by positional control of a 2-axis moving portion. Accordingly, if the position to which a coil is attached by the assembly jig changes while repeatedly attaching a coil with the assembly jig, a program for the positional control of the 2-axis moving portion etc. On the other hand, in the assembly jig 5 of the present embodiment, the base jig part 51 having the guide rails can be adjusted in position with respect to an attachment part to which the base jig part 51 is attached.


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For example, in a structure in which a screw inserted through a through hole formed in the base jig part 51 is tightened into a threaded hole formed in the attachment part, a clearance provided between the through hole and the screw can be made larger than that provided between the guide rail 51 and the roller Accordingly, even if the attachment position to which the coil 3 is attached changes, the attachment position can be easily corrected by adjusting the position of the base jig part 51 with respect to the attachment part.

A method for placing the three-phase coils 3 on the teeth 21 of the stator core 2 and functions and effects of the present embodiment will be described below.

Learn more about Rotating Electrical Machine

In the present embodiment, the insulator 4 that is to hold the last coil 3 C to be placed on the tooth 21 of the stator core 2 is first attached to the tooth 21 see FIG. The three-phase coils 3 U, 3 V, 3 W held on the outer periphery of the insulators 4 are then sequentially placed on the teeth 21 of the stator core 2 one by one in the circumferential direction placement direction D see FIG.

The circumferential direction D in which the three-phase coils 3 U, 3 V, 3 W are sequentially placed one by one is the same as the other side C2 in the circumferential direction. The first coil 3 A can therefore be attached to the tooth 21 by causing the first coil 3 A to directly face the inner periphery of the tooth 21 of the stator core 2 and moving parallel to the radial direction the first coil 3 A toward the outer periphery. In the present embodiment, however, in order to simplify the assembly jig 5 to be used, the first coil 3 A is placed on the tooth 21 by the first to fourth insertion steps similarly to the intermediate coils 3 B described below.

In the present embodiment, the first and last coils 3 A, 3 C to be placed on the teeth 21 of the stator core 2 and the second intermediate coil 3 B as the second coil to be placed on the tooth 21 are the coils that form the neutral point Next, each of the second and the following intermediate coils 3 B to be placed on the teeth 21 of the stator core 2 is placed on the teeth 21 by causing the intermediate coil 3 B to face the tooth 21 in a tilted manner and gradually reducing the tilt angle to cause the intermediate coil 3 B to directly face the tooth 21 see FIG.

Each intermediate coil 3 B has been wound around the insulator 4 when being placed on the tooth The following first to fourth insertion steps are then performed to place the last coil 3 C on the tooth 21 of the stator core 2. In FIGS.

Rotating Electrical Machinery - Standards Australia

At this time, each of an inner peripheral end of the one-side conductor portion 32 A and the outer peripheral end of the other-side conductor portion 32 B has an obtuse-angled corner. The last coil 3 C is deformed by such an amount that the one-side conductor portion 32 A can be inserted into the one-side slot 22 A. The outer peripheral end of the one-side conductor portion 32 A is inserted into the opening of the one-side slot 22 A located on the one side C1 in the circumferential direction of the tooth Next, as shown in FIG.

At this time, the outer peripheral end of the other-side conductor portion 32 B is also inserted into the opening of the other-side slot 22 B located on the other side C2 in the circumferential direction of the tooth In the second insertion step, the last coil 3 C in the deformed state is placed on the tooth The one-side conductor portion 32 A of the last coil 3 C can thus be made not to interfere with the tooth 21 or the immediately preceding coil 3 B placed on the tooth At this time, the outer peripheral end of the other-side conductor portion 32 B is inserted to the boundary position between the intermediate tilted side surface and the base-end parallel side surface in the other-side slot 22 B.

Lec 35 Operation Principle of DC Machine

In the third insertion step, the last coil 3 C is placed on the tooth 21 while returning the last coil 3 C from the deformed shape into its original shape. The other-side conductor portion 32 B of the last coil 3 C can thus be made not to interfere with the first coil placed on the tooth All of the three-phase coils 3 A, 3 B, 3 C are placed on the teeth 21 of the stator core 2 in this manner.

As described above, even if each tooth 21 has the base-end parallel side surfaces in its base end portion having a larger width in the circumferential direction, performing the first to fourth insertion steps allows the last coil 3 C to be easily placed on the tooth 21 so as to avoid interference. Since the teeth 21 have the tip-end parallel side surfaces , magnetic flux passing through the teeth 21 when a current is applied to the coils is less likely to be saturated at the tip ends of the teeth Moreover, forming the base-end parallel side surfaces in each tooth 21 increases the width in the circumferential direction of the base end portion of each tooth 21 , allowing a large amount of magnetic flux to pass therethrough.

The use of the stator core 2 having the shape of the teeth 21 can improve performance of rotating electrical machines. In the method for manufacturing the stator 1 for a rotating electrical machine according to the present embodiment, the last coil 3 C can be smoothly placed on the tooth 21 even if the tooth 21 has a larger width in the circumferential direction of its base end portion. A method for manufacturing a stator for a rotating electrical machine by placing coils in a stator core, wherein each of a plurality of teeth formed in a radial pattern in an inner periphery of an annular yoke portion in the stator core has tip-end parallel side surfaces formed in its tip end portion having a constant width in a circumferential direction, has intermediate tilted side surfaces continuous with the tip-end parallel side surfaces and formed in its portion whose width in the circumferential direction increases closer to an outer periphery, and has base-end parallel side surfaces continuous with the intermediate tilted side surfaces and formed in its base end portion having a constant width in the circumferential direction, and.

The method for manufacturing a stator for a rotating electrical machine according to claim 1 , wherein the last coil is formed by winding a rectangular wire in a plurality of layers arranged in the circumferential direction so that the coil conforms to a shape of the tooth which is formed by the tip-end parallel side surfaces, the intermediate tilted side surfaces, and the base-end parallel side surfaces. The method for manufacturing a stator for a rotating electrical machine according to claim 1 , wherein the last coil is placed on an insulator that is made of an insulating resin and that has been initially attached to the tooth of the stator core.

The method for manufacturing a stator for a rotating electrical machine according to claim 1 , wherein the method uses an assembly jig having a movable jig part that holds the last coil and that is placed so as to face an inner periphery of the tooth, and a base jig part where the movable jig part is movably placed, and. The method for manufacturing a stator for a rotating electrical machine according to claim 2 , wherein the last coil is placed on an insulator that is made of an insulating resin and that has been initially attached to the tooth of the stator core.

The method for manufacturing a stator for a rotating electrical machine according to claim 2 , wherein the method uses an assembly jig having a movable jig part that holds the last coil and that is placed so as to face an inner periphery of the tooth, and a base jig part where the movable jig part is movably placed, and. The method for manufacturing a stator for a rotating electrical machine according to claim 3 , wherein the method uses an assembly jig having a movable jig part that holds the last coil and that is placed so as to face an inner periphery of the tooth, and a base jig part where the movable jig part is movably placed, and.

References 2. Similar Papers. Volume Content.