数控技术双语6.ppt

数控技术 Chapter 4 CNC Unit Chapter 6 THE SERVO SYSTEM OF NUMERICAL CONTROL MACHINE TOOLS Clearly, we can make the rotor advance CCW in 30°steps by closing and opening the Switches in the sequence A，B，C，A，B，C,… Furthermore，we can reverse the rotation by closing and opening the switches in the sequence A，C，B，A，C，B，…In order to fix the final position of the rotor, the last switch that was closed in a switching sequence must remain closed．This holds the rotor in its last position and prevents it from moving under the influence of external torque．In this stationary state the motor will remain locked and provide the external torque that does not exceeded the holding torque of the motor． 6.2.1、 Principle of Stepper Motor 数控技术 Chapter 4 CNC Unit Chapter 6 THE SERVO SYSTEM OF NUMERICAL CONTROL MACHINE TOOLS Clearly, we can make the rotor advance CCW in 30°steps by closing and opening the Switches in the sequence A，B，C，A，B，C,… Furthermore，we can reverse the rotation by closing and opening the switches in the sequence A，C，B，A，C，B，…In order to fix the final position of the rotor, the last switch that was closed in a switching sequence must remain closed．This holds the rotor in its last position and prevents it from moving under the influence of external torque．In this stationary state the motor will remain locked and provide the external torque that does not exceeded the holding torque of the motor． 6.2.1、 Principle of Stepper Motor 数控技术 Chapter 4 CNC Unit Chapter 6 THE SERVO SYSTEM OF NUMERICAL CONTROL MACHINE TOOLS C A B B C A 3 4 1 2 C A B B C A 3 4 1 2 1 C 3 4 2 C A B B A 三相单三拍 A 相 ? B 相 ? C 相 数控技术 Chapter 4 CNC Unit Chapter 6 THE SERVO SYSTEM OF NUMERICAL CONTROL MACHINE TOOLS AB通电 C A B B C A 3 4 1 2 C A B B C A 3 4 1 2 BC通电 CA通电 C A B B C A 3 4 1 2 三相双三拍 AB ? BC ? CA ? AB 数控技术 Chapter 4 CNC Unit Chapter 6 THE SERVO SYSTEM OF NUMERICAL CONTROL MACHINE TOOLS 三相单双六拍 A?AB?B?BC?C?CA?A C A B B C A 3 4 1 2 C A B B C