Development of high speed solenoid valve-investigation of the energizing circuits

The authors discuss electrical circuits they have developed for the purpose of energizing the solenoid valve. These circuits are named the dummy coil method, where energy stored in a dummy coil in the form of a magnetic field is transferred to the energizing solenoid, and the pre-energize method, where the solenoid is electrically energized in advance by taking advantages of the solenoid´s attraction force characteristics. Experimental results have shown that the pre-energize method is highly effective in speeding up the operation of solenoid valves. These experimental results are discussed along with results of calculation that have been conducted using a mathematical model developed by the authors