Application of DC brake application, principle and setting

The DC motor operating conditions:

The altitude is not more than 1000m. Ambient temperature is not more than 40 DEG C; working environment not due to acidic, alkaline or other corrosive gases on the insulation; motor by static rectifying power supply, can also be used in DC power supply; standard excitation 180V voltage, allowing forced excitation, strong Mai voltage does not exceed 500V.

DC braking for three-phase asynchronous motor power is 50-100KW. Requires a smooth no impact, parking accurate, such as knitting, sewing, lifting, lifting machine, etc.; starting before the first brake motor, eliminating the external factors caused by irregular rotation, such as large fans, etc..

Setting the starting frequency and DC braking voltage of the DC brake should follow the following principles:

To ensure that the "creeping" phenomenon of the drive system is eliminated, the DC braking current should not exceed the rated current of the inverter, and the system has no strong vibration in the process of braking.

DC brake mainly set the following three elements:

Starting at the beginning of the DC braking frequency, the DC brake voltage applied to the stator winding is very small, so the DC brake voltage regulation range is usually the main circuit DC voltage of 0~10%; braking time can not be consistent with the actual braking time, to ensure the braking effect, usually set slightly larger.