On November 22, 2023, according to the announcement of the State Intellectual Property Office, Shenzhen Huichuan Technology Co., Ltd. obtained a patent entitled “Inverter control method, frequency conversion system, carrier device and storage medium”, authorized announcement number CN114337464B, the application date is December 2021.

The patent abstract shows that the invention discloses a control method of a frequency converter, a frequency conversion system, a carrying device and a storage medium, which comprises: obtaining the load torque of a carrying device when carrying a target object; Obtain the motor torque during the operation of the motor; Obtain the preset drive power limit value and regenerative power limit value of the

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inverter unit; According to load torque, motor torque, drive power limit value and regenerative power limit value, the output frequency limit value of inverter unit is determined. The inverter unit is controlled according to the output frequency limit value. The method of the invention is based on multiple rectifier units configured on the carrier device. When some of the rectifier units fail, the output frequency limit value of the inverter unit is determined according to the load torque, motor torque, drive power limit value and regenerative power limit value of the carrier device, and the inverter unit is controlled according to the output frequency limit value. The output frequency of the inverter unit is less than or equal to the output frequency limit value to achieve reduced frequency operation.