Shenhua Shendong Coal Group Co. , Ltd.

针对带式输送机在运行过程中电动机功率不平衡的问题,提出按转矩进行负荷分配,在基于功率跟踪控制策略的基础上,确定主电动机采用速度闭环的变频调速方式,从电动机为由主电动机提供转矩给定的控制方式;主、从电动机在转矩分配给定的基础上采用无速度传感器的直接转矩控制与空间电压矢量调制相结合的控制方式,可以对转矩进行直接控制而保证功率平衡,同时通过磁通优化改善电动机运行性能。通过MATLAB仿真和实际现场应用参数验证了此方法可以有效地进行输出转矩分配,并实现功率平衡控制。

According to motor power imbalance issue during the operating process of belt conveyors, a novel control mode was proposed, the master machine ado pted close-loop frequency control, and the torque reference of the slave was provided by the master based on power tracking strategy. Both of master and slave adopte d the control mode combining direct torque control without speed sensor and space vector modulation control based on the torque distribution given, which could direct y control the torque and ensure power balance, while improving motor performance by optimizing magnetic flux. It was verified through MATLAB simulation and field tes ts that the proposed method could effectively allocate the output torque and realize power balance.