Frequency converting control system

A frequency conversion control and winding control technology, which is applied in control systems, AC motor control, electromechanical devices, etc., to achieve the effects of reducing costs, increasing winding coefficients, and reducing harmonics

Inactive Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

The high-voltage and large-capacity brushless doubly-fed motor and its suitable driver have not been reported yet

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029]The invention can be applied to speed regulating systems of high-pressure and large-capacity fan pumps, and can also be applied to wind power or hydroelectric power generation systems. This solution reduces the number of power electronic devices in the traditional high-voltage large-capacity inverter solution, reduces the cost of the power converter, reduces the harmonic content in the system, and improves the efficiency of the system, while maintaining the conventional brushless double-fed Advantages of brushless in motor drive solutions.

[0030] figure 1 It shows the modular structure pr...

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Abstract

The invention discloses a multi-phase brushless double-fed motor and a frequency converting control system. The frequency converting control system comprises the multiphase brushless double-fed motor and a multi-phase driving circuit, wherein a set of power winding and N sets of control windings are arranged in a stator of a multi-phase brushless double-fed motor, and every set of control winding in the N sets of control windings controls the windings to be distributed with a phase of 60 / N electricity degree. The multi-phase driving circuit comprises N power converters respectively connected with the N sets of control windings, N filters respectively connected with N power converters and a phase-shifting transformer. The phase-shifting transformer comprises N auxiliary square windings and N original square windings, wherein the N auxiliary winding square windings are respectively connected with the N filters, and the original square windings are connected with a three-phase power grid. The control windings of the multi-phase brushless double-fed motor is demounted into a plurality of sets from one set, the phase belt width is changed into 30 degrees or less from the conventional 60 degrees, therefore, winding coefficients of fundamental waves of the control windings are improved, harmonic wave magnetic potential is reduced, and efficiency of a motor is improved.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and more specifically relates to a frequency conversion control system. Background technique [0002] Brushless doubly-fed motors originated at the end of the 19th century and were developed from series pole induction motors. The series pole induction motor is to mechanically connect the shafts of two independent winding rotor asynchronous motors in series, and the two rotor windings are connected in anti-phase sequence. The stator winding of one motor is connected to the three-phase grid, and the stator winding of the other motor The stator is connected with a three-phase adjustable resistor. By adjusting the size of the external resistance to change the slip power of the motor, so that the speed of the motor can be adjusted. The advantage of this series pole induction motor is that slip rings and brushes are eliminated, thereby improving the reliability of the motor and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/00H02K3/12H02P27/04
Inventor 万山明吴芳
Owner HUAZHONG UNIV OF SCI & TECH
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