JP3015727U - Self-excited alternator stator core - Google Patents

Abstract

(57) [Abstract] [Purpose] By increasing the magnetic path width of the exciter winding slot back of the stator core in a self-excited AC generator, the electrical output of the generator is increased with the same outer diameter and same product thickness. Provide a stator core of a self-excited generator that can be reduced in size and weight when the electric output is the same. [Structure] An outer peripheral shape obtained by shaping two pairs of diagonals in a substantially square quadrangle into an arc shape, and a plurality of first primary windings formed around a circular opening edge for rotor insertion in a central portion. Stator group (1) of a self-excited alternator having a slot group (2) and a plurality of second slot groups (3) formed to wind an exciter winding, and formed by punching an electromagnetic steel plate. In the second slot group (3), the distance (Le) from the slot opening to the bottom of the second slot group is set shorter than the distance (Lm) from the slot opening to the bottom of the first slot group. ) Is provided at a position corresponding to the straight line portion (1a) on the outer circumference.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stator core of a self-excited alternator having a main generator winding and an exciter winding.

[0002]

[Prior art]

 In the conventional stator core of a self-excited AC generator, the slot into which the main power generation winding is inserted and the slot into which the exciter winding that generates the field in the rotor are inserted have the same shape. (Japanese Utility Model Publication No. 5-11773)

[0003]

[Problems to be solved by the device]

 In a self-excited AC generator, when trying to increase the magnetomotive force of the rotor in order to increase the output of the generator, the slot back (slot) of the exciter winding slot when the rotor comes to the position where it interlinks with the exciter winding It is necessary for a large amount of magnetic flux to pass through between the bottom part and the outer peripheral edge part of the stator core). In a stator core with the same slot shape, the magnetic resistance is higher in the minimum width of the slot back of the exciter winding than in the other parts, and even if the output of the generator is intended to be increased, When the magnetic field reaches the magnetic saturation state in the minimum width of the slot-back magnetic path of the winding, and when trying to obtain a higher output, it is necessary to increase the laminated thickness of the stator core or increase the outer diameter, and increase the size of the generator. It was a factor that increased the weight. The present invention has been made in view of such circumstances, and by increasing the magnetic path width of the exciter winding slot back of the stator core of the self-excited AC generator, the generator of the same outer diameter and the same product thickness can be used. It is an object of the present invention to provide a stator core of a self-excited generator that can increase the electric output and can be reduced in size and weight when the electric output is the same.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a main power generation winding in an outer periphery of a shape in which two pairs of diagonals in a substantially square quadrangle are shaped into an arc, and a circular opening edge for rotor insertion in a central portion. A self-excited AC generator having a plurality of first slot groups formed to wind a coil and a plurality of second slot groups formed to wind an exciter winding, and formed by punching an iron plate. In this stator core, the distance from the slot opening to the bottom of the second slot group is made shorter than that of the first slot group, and the second slot group is provided at a position corresponding to the substantially linear portion of the outer circumference. It is characterized by becoming.

[0005]

[Action]

 In the present invention, since the width of the slot back sandwiched between the slot bottom of the plurality of slot groups formed to wind the exciter winding and the outer peripheral edge of the core is increased, the position where the rotor is linked to the exciter winding is increased. The magnetic resistance of the slot back of the exciter winding at the time of arrival becomes small and a large amount of magnetic flux can pass, and the magnetomotive force of the rotor becomes large.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a stator core 1 of a self-excited AC generator is formed by punching a hoop material of an electromagnetic steel plate (iron plate) with a press machine, and its outer shape is to reduce the amount of waste material after pressing. As it has a straight line shape on the top, bottom, left and right sides of the circle, it has an outer peripheral shape obtained by shaping two pairs of diagonals in a substantially square shape into an arc shape. The inner peripheral surface of the central circular opening of the stator core 1 is divided into 30 equal angles, slots are arranged at the edges of the openings to accommodate the windings, and the main generator winding for supplying load current to the outside is accommodated. The main power generation winding slot group 2 is provided in # 1 to # 10 and # 16 to # 25. Exciter winding slot groups 3 for accommodating the exciter windings provided to generate a field in the rotor are provided at # 11 to # 15 and # 26 to # 30. Slots # 11 to # 15 and # 26 to # 30 of the exciter winding slot group 3 are arranged at positions where the outer shape of the stator core 1 corresponds to the straight line portion 1a. The slot shape is a semi-closed slot, and the distance Le from the slot opening to the bottom of the exciter winding slot group 3 is shorter than the distance Lm from the slot opening to the bottom of the main power generation winding slot group 2. ing.

A plurality of the stator cores 1 are stacked in the axial direction and mechanically coupled to form a stator core ASSY. As this joining method, a method such as caulking or welding the outer periphery is used. After inserting a sheet for electrical insulation into each slot of the stator core ASSY, each winding is wound. One slot of the main generator winding is wound so that 34 insulated wires with a wire diameter of 0.9 mm are inserted, and one slot of the exciter winding has an insulated wire with a wire diameter of 0.65 mm. It is wound so that 44 pieces can be inserted. Since the total cross-sectional area of one slot of the main power generation winding is 21.63 mm 2, and the total cross-sectional area of one slot of the exciter winding is 14.6 mm 2, the required cross-sectional area of the exciter winding is This is equivalent to 67.5% of the main power generation winding, and even if the distance from the slot opening to the bottom is shorter than the main power generation winding slot, all insulated wires can be inserted.

Since the distance Le from the slot opening to the bottom of the exciter winding slot group 3 is formed to be shorter than that of the main power generation winding slot group 2, the width of the slot back from the slot bottom to the outer edge becomes large. In particular, the slots # 13 and # 28 are the closest to the straight line portion 1a of the outer edge, so that the magnetic resistance of the magnetic path of that portion is the largest and it is a bottleneck for securing the magnetic path. The expansion of the width of the back increases the amount of magnetic flux until magnetic saturation.

In FIG. 2, a main power generation winding and an exciter winding are wound around a stator core ASSY 20 in which a plurality of stator cores 1 of this embodiment are stacked and coupled in the axial direction, and an engine driven brushless used in a small portable engine generator Figure 2 shows the circuit configuration of a self-excited AC generator of the type. In FIG. 2, the rotor 10, the field winding 11, the diode 12, the main power generation winding 21, and the exciter winding 22 are shown. The main power generation winding 21 and the exciter winding 22 have an electrical angle of 90 degrees. It is wound on the stator core ASSY 20 so as to have a phase difference of. A capacitor 23 is connected to the exciter winding 22, and an external load is connected to the main power generating winding 21. The rotor 10 is driven by being connected to a crankshaft of an engine, is rotatably held inside the stator with a small air gap, and is connected with a diode 12 to wind a field winding 11 forming a closed circuit. Has been done.

When the rotor 10 rotates together with the crankshaft, the phase-advancing current flows in the exciter winding 22 due to the residual magnetic flux of the rotor core, and the antiphase rotating magnetic field caused by the armature reaction induces in the field winding 11. The self-excited field is obtained by half-wave rectifying the AC voltage having a doubled frequency by the diode 12. Further, at the time of load, the single-phase armature reaction due to the combined armature current of the current of the capacitor 23 connected to the exciter winding 22 and the load current increases as the load current increases, and due to the positive phase advance current. Since both the magnetomotive force and the magnetomotive force of the field current due to the current of the opposite phase increase, the self-exciting effect of the field increases, and as a result, the generator causes the shunting effect of the current of the capacitor 23 to reduce the load current. The series winding effect is added, and a substantially constant voltage can be obtained regardless of the compound winding characteristic, that is, the size of the load.

Since the width of the slot back from the slot bottom portion to the outer edge of the exciter winding of the stator core 1 of the present embodiment is larger than that of the conventional stator core having the same slot shape, the rotor 10 has the exciter winding 22. Since the magnetic resistance of the slot back of the exciter winding slot when it comes to the position where it intersects with the rotor winding becomes small, a large amount of magnetic flux can be passed, and the magnetomotive force of the rotor 10 becomes large. The output of can be increased.

[0013]

[Effect of device]

 In the present invention, the main power generating winding is formed around the outer periphery of the two squares of a substantially square quadrangular shape that are shaped like arcs and the circular opening edge for inserting the rotor in the central portion. In the stator core of the self-excited AC generator, which has a plurality of first slot groups and a plurality of second slot groups formed to wind the exciter winding, and is formed by punching an iron plate, Since the distance from the slot opening to the bottom of the slot group is made shorter than that of the first slot group, and this slot group is provided at a position corresponding to the substantially straight line portion of the outer circumference, all slots having the same slot shape are formed. Compared to the data core, the output of the generator increases under the condition of the same outer diameter and the same product thickness, the temperature rise can be suppressed under the same output condition, and the product increases under the same output and the same temperature rise condition. Reduce thickness Was a small generator, it is possible to contribute to weight reduction.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a brushless type self-excited AC generator using an embodiment of the present invention.

[Explanation of symbols]

1 ... Stator core 1a ... Straight part 2 ... Main power generation winding slot group 3 ... Exciter winding slot group Le ... Exciter winding slot group 3 from slot opening to bottom Of the main power generation winding slot group 2 from the slot opening to the bottom portion 10 ... Rotor 11 ... Field winding 12 ... Diode 20 ... Stator core ASSY 21 ... Main power generation winding 22 ・ ・ ・ Exciter winding 23 ・ ・ ・ Capacitor

Claims (1)

[Scope of utility model registration request] 1. A substantially square-shaped quadrangle having two sets of diagonally shaped arcuate outer circumferences, which are formed to wind a main power generation winding around a circular opening edge for rotor insertion in a central portion. In a stator core of a self-excited AC generator, which has a plurality of first slot groups and a plurality of second slot groups formed to wind an exciter winding, and is formed by punching an iron plate, The distance from the slot opening to the bottom of the slot group is formed shorter than that of the first slot group, and the second slot group is provided at a position corresponding to a substantially straight line portion of the outer circumference. The stator core of a self-excited AC generator.