Nanyang explosion-proof motor | High voltage motor claim method

2023-11-22 08:42:08

The manufacturer of explosion-proof motors in Nanyang stated that high-voltage motors generally have a high power output, which poses a severe impact on the power grid. So there will be specific claims and methods to reduce the current. This time, let's talk about the proposal for high-voltage motors.

If the motor capacity is less than the power supply capacity and below 1000KW, it can be directly claimed. At this time, the impulse current is 3-6 times the rated value (of course, the direct claim for synchronous motors refers to the same low voltage, first different then equal method. In order to avoid excessive impulse current, it is necessary to consider reducing the claim current for large motors: there are multiple methods such as series reactance claim, frequency conversion claim, hydraulic coupling claim, etc. If there is any confusion, it can be simplified.

To complete the speed regulation of high-voltage motors, the first three methods to choose are:

(1) Hydraulic coupling method

Namely, a hydraulic coupling device is connected in series between the motor and the load, and the speed regulation of the load is completed by adjusting the coupling force between the motor and the load through the concavity and convexity of the liquid surface;

(2) Cascade speed regulation

The manufacturer of Nanyang explosion-proof motor stated that it is necessary to use a wound asynchronous motor for cascade speed regulation, which rectifies and inverts a portion of the energy of the rotor winding before sending it back to the power grid. This is equivalent to regulating the internal resistance of the rotor and then changing the slip of the motor; Due to the general inequality between the voltage of the rotor and the voltage of the power grid, a transformer is required for grid inversion. In order to save this transformer, the method of internal feed motor is commonly used in the domestic market, which is to create a three-phase auxiliary winding on the stator to specifically receive the rotor's response energy. The auxiliary winding also participates in work, so that the energy absorbed by the main winding from the power grid will be reduced, achieving the goal of speed regulation and energy conservation.

(3) Concave convex method

Due to the unresolved issue of high-voltage frequency conversion technology at that time, a transformer was selected to reduce the grid voltage first, and then a low-voltage frequency converter was selected to complete the frequency conversion; There are two methods for motors, one is to choose a low-voltage motor; Another approach is to continue using the original high-voltage motor and add a step-up transformer between the frequency converter and the motor.

The above information was compiled and released by the Nanyang explosion-proof motor manufacturer. Thank you for watching.