Since the use of the 64-bit based operating system has been expanded recently, more memories have been produced. In this circumstance, memory test among memory production processes has been of importance. For memory test, it is required to insert a memory in a socket. At this time, the memory appearance is damaged often. Most memory test handlers control a memory position. For this reason, if memory position data is entered incorrectly, such a handler can impose too much force on the memory appearance and thereby can raise the risk of appearance damage. Therefore, this study proposes the method of imposing a proper degree of force with the use of torque limit function when a servo motor makes position control, rather than torque control.In case of servo motor drive, it is possible to use the torque limit function for position control. Usually, in the program for servo driver, it is required to enter a torque limit value. In this study, with the use of RS485 communication, it is possible to send a command to a particular address of servo drive and control a torque limit value in real time. Memory test is important in memory production processes. A memory test handler plays an essential role in the test. A memory needs to be move to a position by a servo motor in a test. Sensors are already used to check if the equipment moves accurately and if a product is in a right position. If it is possible to impose a proper degree of force on a servo motor, the damage rates of memory products and sockets can be reduced. Therefore, production life can be lengthened and workers’ safety can be increased. The program controlling a torque limit value on the basis of the model proposed in this study was applied. As a result, a servo driver changed a torque limit value normally. When the limit value was very low at the time of inserting a memory in a socket, the memory was not inserted in the socket and thereby the memory testfailed. When a normal torque value was entered, the memory was inserted in the socket well and thereby the memory test was conducted normally. In the future, it will be necessary to make a change while test equipment is in operation, and to lower a torque limit value to prevent collision with a worker when the door of test equipment is opened.
Volume 11 | 07-Special Issue
Pages: 1767-1772