Variable frequency speed-adjusting system for motor
A technology of variable frequency speed regulation and three-phase current, which is applied in the control system, single motor speed/torque control, vector control system, etc. It can solve the problems of large volume, high cost of high-voltage frequency converter, difficult operation and maintenance, etc. High efficiency and energy saving effect
Active Publication Date: 2011-11-16
DAYU ELECTRIC
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Problems solved by technology
This leads to high cost, large volume, complex control system, and difficult operation and maintenance of high-voltage inverters, which seriously hinders its popularization and application.
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[0023] In the following, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0024] figure 1 A motor frequency conversion speed regulation system according to an embodiment of the present invention is shown. Such as figure 1 As shown, the motor frequency conversion speed regulation system of this embodiment includes: a motor and a frequency conversion speed regulation device. Wherein, in the speed regulating system of this embodiment, the motor includes a first stator winding and a second stator winding, wherein the first stator winding (that is, a power winding or a high-voltage winding) has a first number of pole pairs G of the winding, which is used to connect A high-voltage AC power supply such as a high-voltage power grid, in which the second stator winding (that is, the control winding or the low-voltage winding) has the number of pole pairs D of the second winding, and is used to connect to a low-volt...
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The invention relates to a variable frequency speed-adjusting system for a motor, which comprises a motor. The motor comprises a first stator winding, a second stator winding, a rotor winding, a variable frequency speed-adjusting device, an inverting unit, a first current detecting unit and a controller, wherein the first stator winding comprises first winding pole pairs G and is used for being connected with a high-voltage AC power supply; the second stator winding comprises second winding pole pairs D; the variable frequency speed-adjusting device comprises a rectifying unit and the output end of the rectifying unit is connected with the low-voltage AC power supply; the input end of the inverting unit is connected with the output end of the rectifying unit while the output end of the inverting unit is connected with the second stator winding; the first current detecting unit is used for detecting the three-phase current of the first stator winding; the second current detecting unit is used for detecting the three-phase current of the second stator winding; and the input end of the controller is connected with the first and the second current detecting units while the output end of the controller is connected with the input end of the inverting unit. According to the technical scheme disclosed by the invention, a high-voltage high-power motor can be controlled by a low-voltage low-power variable frequency speed-adjusting device.
Description
technical field [0001] The invention relates to motor technology, in particular to a motor frequency conversion speed regulation system. Background technique [0002] At present, the frequency conversion speed regulation of the high-voltage motor usually uses a high-voltage frequency converter to control the high-voltage motor. For the safety and reliability of the entire speed control system, the capacity of the high-voltage frequency converter usually used is greater than the rated capacity of the high-voltage motor. This leads to high cost, large size, complex control system and difficult operation and maintenance of high-voltage frequency converter, which seriously hinders its popularization and application. Contents of the invention [0003] Considering the above problems, an object of the present invention is to provide a motor frequency conversion speed regulation system, which can use a low-voltage low-power frequency conversion speed regulation device to control ...
Claims
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IPC IPC(8): H02P27/06H02P6/08
CPCH02P21/00H02P27/06H02P6/08
Inventor 王怡华程世国宁国云曾贤杰
Owner DAYU ELECTRIC