Abstract
This paper describes a method for the accurate computation of the dynamic operating characteristics of an electromechanical system such as a relay or solenoid or other electromagnetic device. This method is based upon the principle of conservation of energy and is particularly useful in systems where energy is transformed from one form to one or more other forms. While an a-c-operated contactor or relay will be used to demonstrate the method in this paper, the method is not restricted to this type of device only, but can be applied to any type of dynamic system. This type of approach is one which is possible and practical because digital computers can be used to do the calculations in a reasonable length of time.
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