Calculation of static thrust on a linear DC actuator

In recent years, researcher has developed many actuators with different configurations depending on application required. Linear actuator has become one of the most popular actuator used in industry especially in office automation and factory automation. Linear motor, which have a compact and simple structure are easy to control compare to rotational motor [Technical committee of IEEJ on small precision motor, 1991]. The advantages of linear actuator are small size, low power and high thrust. The thrust of linear motor can be applied on to the load without any mechanical loss as rotation motor. This paper presents on the basic principle of a linear DC actuator (LDA), the structure and the thrust generation. The derivation of thrust expression and calculation of thrust are discussed in detail. The reluctance of linkage flux is considered to achieve a good accuracy of calculation. The calculation result and the measurement are compared. As a result the calculation and measurement are in the good accuracy of calculation result.