abb主从控制（ABB master slave control）.docVIP

abb主从控制（ABB master slave control） 2.3 master slave control 2.3.1 master-slave connection The master-slave control is designed for multi motor drive system, each motor are respectively controlled by a separate inverter so the master-slave control can be used to control the method of vector control and direct torque control with torque capacity. Using the high performance control algorithm, can establish a reasonable relationship between the load distribution in the synchronous operation mechanism, give full play to the motor output torque. There are two kinds of connection mode of master-slave control: (1) from the host machine and the motor shaft through a gear and a chain of rigid connection, such as shown in Figure 1 (a). The torque control mode from the machine, so that the transmission unit between the average distribution of load torque, this is by mechanical structure to guarantee the speed synchronization, because each motor are respectively controlled by separate inverter, ensuring each motor bear the load distribution is reasonable, to prevent the emergence of torque distribution imbalance, even to each other the two phenomena. (2) when the host and from the motor shaft machine with flexible connection, such as shown in Figure 1 (B). The machine should be adopted in the speed control mode, in this case, the mechanical structure can not guarantee synchronous operation, the transmission system is composed of AC converter. In addition to the speed control mode of speed to solve the synchronization problem, but also by the torque load droop characteristic average distribution of torque on the motor at all. Figure 2 shows the torque droop function principle: the use of parameters specified rated load torque under the speed difference, while the system according to the actual speed torque and rotor speed determine the actual value, as shown in (1). In this way, the system can automatically adjust the speed according to the given torque and speed have the ability