SP-70B series introduction and application

Main applications and characteristics:
SP-70B series are suitable for many applications, for example, (1）Heat treatment of gear and shaft（2）Heating of stainless steel parts in kitchen wares factories for shaping.   （3）Heating of rods for shaping  （4）Heating of rotors or stators for fitting.
Due to the adopting of our third generation inverting control technology, SP-70B series machines are characterized with high reliability, the oscillating cap is connected to the primary coil of the transformer, so SP-70B is also characterized with low price.

Advantages and applications of models with Timer function:
1. Heating power, retaining power, heating time, retaining time can be preset and adjusted, this makes it possible to control the heating curve and heating time.
2. It is suitable to use in the repeated heating or high speed heating of small parts;
3. When using in brazing, with proper timing parameters, rapid heating and retaining can be achieved to keep the temperature while the brazing material is melted and then to let the brazing material spread smoothly to form good joint.
 

Advantages and applications of separated transformer:
1. In this series machine, the high frequency transformer is separated from the generator, with 2 meters connecting cable at least.
2. It is suitable to use in the dirty or corrosive surroundings, the generator can be put in a clean space to increase the reliability.

Working theory and structure
In SP-70B series machines, series oscillating circuit is applied, through high frequency transformer, low voltage and high current power is output to go through the induction coil. 
Inside these series machines, IGBT module and our third generation inverting control technology has been used, that is the soft and dual control and inverting technology. In this technology, output power and frequency can be controlled and adjusted separately, IGBT module and soft switching control technology are used in the high frequency switching circuit to control the output power.  In the inverting circuit, the IGBT and frequency tracing circuit is applied to achieve high speed and accurate soft switching control. The adoption of new technologies not only improves the quality and reliability of the machine，but also solve the technology problem on large power induction heating machine and makes it possible to work 100% duty cycle.
In old type SP-70B series machines, oscillating cap is connected to the primary coil of the high frequency transformer, due to the low cost of this structure, SP-70B is characterized with low price, but there is high voltage and high consumption on HF transformer.  Since year 2013, SP-70B adopt totally SPG technology and structure, by using large power oscillating cap, HF transformer problem has been solved and at the same time , price of it is kept the original level, so it is one of the most welcomed machines with wonderful character and low price.