Anti-rotation measure of air cooling island permanent magnet synchronous motor in strong wind environment

Abstract

The invention discloses an anti-rotation measure for an air cooling island permanent magnet synchronous motor in a strong wind environment, and the method comprises the following steps: 1, enabling a three-phase input cable of the permanent magnet motor to be automatically short-circuited under the action of a contactor when a frequency converter does not supply power; 2, after the frequency converter supplies power, an auxiliary voltage output terminal of the frequency converter outputs 24V direct current, and a contactor in the circuit executes an opening action; 3, when the contactor breaks down, the frequency converter loses a feedback signal of the contactor, power is automatically cut off, the control circuit is used for the permanent magnet motor, the problem that the motor rotates under the action of external force, which cannot be solved by a traditional driving mode, is thoroughly solved, and the control circuit is suitable for all permanent magnet motors which can rotate under the action of external force; the frequency converter is effectively protected from being damaged when the permanent magnet motor feeds back electric energy in a power generation state; braking is realized under the condition of not adding any braking device; reconstruction cost can be reduced, and system safety and reliability are improved.

Description

technical field [0001] The invention relates to preventing the rotation of the motor driven by wind blades driven by strong wind under the motor stop state, and increasing the safety and reliability of the bridge frame of the air-cooled island, in particular to anti-rotation measures for the permanent magnet synchronous motor of the air-cooled island under the strong wind environment. Background technique [0002] The special frequency conversion permanent magnet direct drive motor for air-cooled island is a special drive equipment for air-cooled island. This equipment has technical advantages such as high efficiency and energy saving, simple transmission, and maintenance-free. There is always an unsolvable problem in the application. When the temperature is low, the cooling fan of the air-cooled island works intermittently (or does not need to work). At this time, because the fan is in a strong wind environment, the strong wind can blow the blades and drive the unpowered sta...

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Problems solved by technology

[0002] The special frequency conversion permanent magnet direct drive motor for air-cooled island is a special drive equipment for air-cooled island. This equipment has technical advantages such as high efficiency and energy saving, simple transmission, and maintenance-free. There is always an unsolvable problem in the application. When the temperature is low, the cooling fan of the air-cooled island works intermittently (or does not need to work). At this time, because the fan is in a strong wind environment, the strong wind can blow the blades and drive the unpowered state. The high-speed rotation of the motor seriously affects the safety of the unit, and causes difficulty in starting the motor when the air-cooled island is put into operation, which affects the safety of the generator set. At the same time, the rotation of the permanent magnet motor will generate electric energy, which is transmitted to the line and the inverter. Affect the safety of staff during equipment maintenance; therefore, it is necessary to prevent the permanent magnet motor from rotating under strong wind conditions

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