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Internal compensation method of A.C motor and its winding connection method

A technology of AC motor and compensation method, which is applied to the shape/style/structure of winding conductors, reactive power compensation, reactive power adjustment/elimination/compensation, etc., which can solve the problem that the effect of capacitance compensation does not extend to the inside of the motor and the starting current is large , low reliability and other issues

Inactive Publication Date: 2004-02-25
刘建平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the in-situ compensation method has the problem that its capacitance compensation effect does not extend to the inside of the motor, and the double-winding internal compensation method has the problem that the capacitor is not allowed to be disconnected during operation, which has low reliability, large starting current, and hierarchical control of compensation capacitors. The problem of imperfect

Method used

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  • Internal compensation method of A.C motor and its winding connection method
  • Internal compensation method of A.C motor and its winding connection method
  • Internal compensation method of A.C motor and its winding connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The stator core, squirrel-cage rotor, shell, accessory parts, AC contactor, single-phase 250V power capacitor and 400V power capacitor bank of an ordinary three-phase asynchronous motor are used together. The stator core is 72 slots, the number of poles is 6 poles, three power terminals and three compensation terminals are set in the junction box, and the conventional double-stacked winding process is used. A slot number corresponds to a coil, and the phase table of the slot number on the upper side of the coil is used to indicate the arrangement and wiring of the stator coil. The connection direction from which the first end enters the coil and exits from the end is called positive connection, and vice versa, it is reverse connection. Accordingly, a negative sign is added before the slot number representing the reverse connection of the coil. The arrow marked next to each winding segment in the wiring diagram is not only the positive direction of its voltage, but also the ...

Embodiment 2

[0020] The number of stator slots is 72 slots, the number of poles is 4 poles, each winding adopts the same number of turns, and the winding pitch y=1-17. The slot number phase table method described in Example 1 is still used to show that the coil arrangement of a total of twelve winding segments with each phase stator winding divided into four winding segments is shown in Table 2:

[0021] Phase A

[0022] in figure 2 U 1 , V 1 , W 1 Use an AC contactor at the three ends to connect to the positive phase sequence of three-phase AC power supply in turn. 2 With V 1 , V 2 With W 1 , W 2 With U 1 Connect both ends to C 01 , C 02 , C 03 Three single-phase capacitors, and the U 2 , V 2 , W 2 Three-terminal connection C 04 , C 05 , C 06 Three-phase capacitor bank. When the method in this example is used for a load with a small moment of inertia, all of its capacitors can be fixedly connected to the compensation terminal and the power terminal through the current detection dev...

Embodiment 3

[0024] In this example, the number of slots in the stator is 60, the number of poles is 4, the windings use equal turns and the pitch Y=1-14. The connection method of each phase winding is divided into two winding segments, see image 3 , The coil arrangement of each winding segment is shown in Table 3:

[0025] Phase A

Phase B

Phase C

WA 1

1 2 3 4 5

31 32 33 34 35

WB 1

11 12 13 14 15

41 42 43 44 45

WC 1

21 22 23 24 25

51 52 53 54 55

WA 2

-16 -17 -18 -19 -20

-46 -47 -48 -49 -50

WB 2

-26 -27 -28 -29 -30

-56 -57 -58 -59 -60

WC 2

-36 -37 -38 -39 -40

-6 -7 -8 -9 -10

[0026] When the three zigzag series winding sections of this example are connected to form a three-phase zigzag star connection, the U 2 , V 2 , W 2 The three compensation terminals are connected to C 01 , C 02 , C 03 Three single-phase capacitors and connection C 04 , C 05 , C 06 Th...

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Abstract

The present invention provides an internal compensation method of AC motor and its winding coupling method. The capacitor internal compensation uses the capacitor to make the interconnected star stator winding respectively produce its current superposition and phase-shifting action to make the resultant currents of two-to-four winding parts divided from every phase approach to that all the phasesare identical and numerical values are uniform so as to raise the induced potential of stator winding and reduce the loss of reactive current. The interconnected star winding has three compensation ends with two or three winding parts led from three-phase stator winding, and can be coupled into several forms of hexagonal-three-star form, hexagonal-six-star form, interconnected star and variable-electrode 3-V type.

Description

1. Technical Field [0001] The invention belongs to the field of motor disciplines, and in particular relates to an internal compensation method of an AC motor and a method for connecting windings thereof. 2. Background technology [0002] The compensation methods used by the current technology for the inductive reactive current of three-phase AC motors mainly include the so-called in-situ compensation and dual-winding internal compensation. Reactive on-site compensation is to directly connect a three-phase capacitor bank next to the motor, and use the compensation effect that the capacitive current is ahead of the voltage phase to reduce the reactive power loss of its distribution lines. The dual-winding internal compensation is the inventor of the present invention and applied for a utility model patent in 2001. Its name is "Dual-winding Capacitor Internal Compensation Motor" and the patent number is ZL01228605.2. This type of dual-winding internal compensation is to connect the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02K3/28
CPCY02E40/30
Inventor 刘建平刘涛
Owner 刘建平
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