Abstract:
In order to, the research of a high frequency induction transformer to generate high intensity magnetic field still have got a disadvantage, in the term of high energy loss in primary coil and secondary coil of system. To solve the above problem, this thesis studies and develops the control system of heat induction for coating to consume energy less using the inductor load directly connect to a half bridge inverter circuit. This technique does not effected to the energy consume in transformer.
In the experiment, the system has been tested by tuning the frequency from micro controller. This turning is reached the best and suitable frequency for this system which is 47 kHz. This system is also controlled by on/off controller and PID controller. Both controller systems are compared. The control signal was directly convert from analog to digital signals and then pass it to a processor. The results will be used to find the best level of metal harden-coating in future experiments.
In the term of apply to material harden-coating research, this system is tested with the metal screw which is a 25 mm long, 6 mm diameter. The object was heated through current control at 3 A for 1 minute with the same resonance frequency. The object was then put in the constant 27 degree Celsius water for 15 seconds to reduce the temperature. Then the object was determined the hardness. It was found that the object hardness was increased from between 287.6288.9 MPa to 322.5330.8 MPa, and power consumption of the system was 100200 W. As a result, this system can be applied to a mini coating or further research.