(1) The heating form is divided into:

①Indirectly heated rice cooker, whose structure is divided into three layers: the inner pot, the outer pot and the pot body. The inner pot is used for food, the outer pot is used to install electric heating elements, thermostat and timer. These electrical components are fixedly mounted on the outer pot as a single unit and sealed. The outermost layer is the body of the cooker, which plays the dual role of safety protection and decoration. The advantages of this rice cooker: food heating is uniform, the rice made on the top and bottom of the soft and hard consistency, the inner pot can be removed, easy to clean; disadvantages: more complex structure, time-consuming, power consumption;

② directly heated rice cooker: this rice cooker is characterized by: use of the electric heating element directly on the food put in the inner pot of heating. Unlike indirect heating type rice cooker, the electric heating element to the outer pot of water heated into steam, steam and then the inner pot of food heating. Therefore, its high efficiency, save time and electricity, the disadvantage is to make the rice is easy to make the top and bottom of the soft and hard inconsistent.

(2) from the structure of the form of points are:

① Combination of rice cooker, pot and electric seat is not fastened between the connection, the pot is placed on the electric seat, can be easily removed, not only to facilitate the cleaning, but also can be put on other heaters or dining table;

② whole rice cooker, electric heating element directly fixed in the pot at the bottom of the pot, the whole pot to form a whole. Integral rice cooker due to the different structure of the pot, can be divided into a single layer of rice cooker, double rice cooker and three layers of rice cooker three.

(3) according to the control mode:

① heat preservation, press the power switch when cooking, rice cooked power supply is automatically disconnected, when the temperature falls below 65 ℃, heat preservation switch is connected to the circuit, the temperature rises to 65 ℃, the power supply is automatically disconnected, so that alternately through to achieve the purpose of heat preservation.

②Timing start insulation type, the pot will be rice, water, put a good, open the timer switch, can be selected within 12h to start cooking time. After the rice is cooked, it can keep warm automatically to save energy.

③Computer control type, the use of computers for program control, so that the rice cooker work automation program higher.

The material of the pot body of electric rice cooker includes ceramic, enamel, aluminum alloy and stainless steel. The inner wall of the inner pot is usually sprayed with a PTFE anti-scorching coating, which makes it difficult to paste when cooking rice and easy to clean.

The heating element of electric rice cooker, there are electric heating tube heating plate and P.T.C. element heating plate. Electric heating tube heating plate has good insulation, corrosion resistance, thermal conductivity and mechanical strength, long life, high efficiency; P.T.C. element heating plate has a positive temperature coefficient of resistance and automatic control of the temperature characteristics, high efficiency, no open flame, high security, the temperature rises quickly by the power supply fluctuations in the small impact.

The temperature control element of the rice cooker has a bimetal temperature control system and magnetic material temperature control system, the former is not as safe and reliable as the latter.