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High-power brushless double-fed motor variable frequency speed control system and starting method thereof

A technology of variable frequency speed regulation and motor, which is applied in the direction of motor generator/starter, single motor speed/torque control, AC motor control, etc., and can solve problems such as easy sparks, high cost of frequency converter, and reduced motor reliability , to achieve cost saving, stable start-up process, safe and reliable operation

Inactive Publication Date: 2010-01-06
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cage-type rotor induction motor frequency conversion speed regulation system Since the power of the frequency converter is slightly greater than the power of the motor, in applications that require high-power motors, the power of the frequency converter is also large, and the cost of the frequency converter is high
Wound rotor induction motors use brushes and slip rings to realize the connection between the rotor winding and the inverter circuit. Due to the sliding contact and wear of the brushes, not only the reliability of the motor operation is reduced, but also the brushes need regular maintenance and replacement, which increases the Operating costs and unreliability
In addition, sliding contacts are prone to sparks, which reduces the application of wound rotor induction motors in environments containing flammable and explosive gases

Method used

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  • High-power brushless double-fed motor variable frequency speed control system and starting method thereof
  • High-power brushless double-fed motor variable frequency speed control system and starting method thereof
  • High-power brushless double-fed motor variable frequency speed control system and starting method thereof

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing.

[0013] Such as figure 1 and 2 The shown high-power brushless doubly-fed motor frequency conversion speed regulation system of the present invention includes a brushless doubly-fed motor 1 and a frequency conversion controller 2, the stator power winding 4 of the brushless doubly-fed motor 1 is directly connected with the power frequency grid 3; the stator The control winding 5 is connected with the frequency conversion controller 2; the frequency conversion controller 2 is directly connected with the power frequency grid 3; the stator power winding 4 and the stator control winding 5 are star-connected; the rotor of the brushless doubly-fed motor 1 is a reluctance rotor 6; The number of poles of the stator power winding 4 is 2p, the number of poles of the stator control winding 5 is 2q, and the number of poles of the reluctance rotor 6 is p r =p+q, the brushless double-fed...

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Abstract

The invention relates to a variable frequency speed control system, in particular to a high-power brushless double-fed motor variable frequency speed control system and a starting method thereof. The variable frequency speed control system comprises a brushless double-fed motor and a variable frequency controller, wherein a stator power winding of the brushless double-fed motor is directly connected with a power frequency electric network; a stator control winding is connected with the variable frequency controller; the variable frequency controller is directly connected with the power frequency electric network; the stator power winding and the stator control winding are in star shape connection, and the pole numbers of the stator power winding is different from that of the stator control winding; and a rotor of the brushless double-fed motor is a magnetic resistance rotor. The variable frequency speed control system has the following advantages: the cost of the speed control system is greatly reduced, the power factors of the power winding can be adjusted at will, the starting process is smoother, and the variable frequency speed control system is more suitable for the requirements on load use of fans and water pumps.

Description

technical field [0001] The invention relates to a frequency conversion speed regulation system, in particular to a frequency conversion speed regulation system and a starting method of a high-power brushless double-fed motor. Background technique [0002] At present, in the frequency conversion speed regulation system applied in the field of fans and water pumps, the motors used mainly include cage rotor induction motors and wound rotor induction motors. The frequency conversion speed regulation systems composed of these two motors have their own advantages, but they also have their own advantages. Each has its own disadvantages. The frequency conversion speed regulation system of the cage rotor induction motor is because the power of the frequency converter is slightly larger than the power of the motor. In the application where a high-power motor is required, the power of the frequency converter is also large, and the cost of the frequency converter is high. Wound rotor i...

Claims

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Application Information

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IPC IPC(8): H02P27/04H02P1/50H02P6/08H02P6/20
Inventor 王正张凤阁王凤翔
Owner SHENYANG POLYTECHNIC UNIV
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