分类： 信息化
2013-09-26 17:25:45
of start and brake state according to the equivalent heat should be converted into equivalent per hour all start times, and to determine the start times the equivalent full quota of the motor. Conversion of method is:
(1) move (final speed not more than 25% of the rated speed) is equivalent to 0.25 times the whole start;
(2) gantry electric braking to halt is equivalent to 0.8 times the start;
(3) electric braking to reverse at full speed is equivalent to 1.8 times the start.
Gantry crane motor in each cycle heat only consider the work (power) and stop (power) time, without considering the motor in the process of start increasing heat and heat capacity factors, such as the start times for each hour less than 6 times of the motor, not a real impact; But when the number gradually increased to a certain program, you must enough consideration to these factors.
In the process of start motor in the process of gradually accelerated, its
average speed lower than rated speed, so the cooling effect also is rated speed
is low. For gantry crane motor fever does not exceed the permissible temperature
rise, it is necessary to reduce motor rated runtime power output, the larger the
number of start, the required power output drop more.
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