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PQS系列屏在起重机起开机构上应用已达十年之久。单电机原理图见图1。在实际使用中,用户反映的问题很多,其中最严重的问题是换向时的相间短路。由此而引起的后果为:
PQS series screen crane crane in the organization has been applied for 10 years. Single motor schematic diagram shown in Figure 1. In actual use, the user reflects many problems, one of the most serious problem is the commutation phase short circuit. The resulting consequences are: