Basic info
Oracle combine different technologies: microwaves for a fast heat transfer, convection through resistors for evenness and impingement
Customer can choose between two different operation mode
Combi Wave: as a traditional convection oven 30 – 300°C, as a microwave oven with 2000Kw power or with a combination of those operation mode to allow traditional cooking
High Speed Oven: which combine convection, impingement and microwaves with a cooking temperature range 100 – 300°C
Impingement System
The impingement system let direct a strong hot air flow from the top side just on the surface of the food draying the surface.
This air flow is more efficient than the convection effect for the surface of the food and let achieve relevant cooking results.
The air flow of impingement goes through the catalyzer to remove from the air flow the smoke
Convection System
The convection system is one of the most efficient way to achieve evenness; it works distributing the heat from the heat source, in this case a resistor, trough air recirculation on the cooking chamber.
On Oracle the convection effect is managed by the heating elements, the chamber’s fan and the cooking plate that let the air be blown under the plate and sucked through the chamber to the fan.
In addition the hot air, heating the cooking plate, allow to cook by direct contact
Microwaves System
Microwaves generated on the magnetron are conducted to the cooking chamber by wave guides which are positioned with different angles in order to achieve the best power distribution and at the same time avoiding interaction between the two magnetron.
The food will absorb the energy of the microwaves; it’s important that any food is present inside the chamber when activating microwaves.
In case there is no product capable of absorbing microwave energy, those microwaves will be reflected causing plasma sparks on the side of the chamber but also on the antenna of the magnetron which can be seriously damaged.
Microwaves
Microwaves are electromagnetic waves and have wavelength between 1mm and 1m (300GHz – 300MHz) with a wide applications range
Microwaves applied to the cooking operate at 2,45GHz through dielectric heating primarily by absorption of the energy in water.
It’s mandatory to verify in advance if materials introduced into the appliance are suitable to microwave emission to avoid serious damages to the appliance and his components
The magnetron is a high-power vacuum tube which generates microwaves by the interaction of a stream of electrons with a magnetic field. The magnetron is composed by an electrode which when heated up emits electrons through 2 permanent magnets and a resonance cavity will generate a microwaves beam.
The magnetron works with high voltage power. The HV Transformer converts the line phase to a 2500Vac while the capacitor is part of a LC circuit with the discharge of the Diode.
Power management
The power management is managed in different way depending on the model in any case the cooking time is managed considering the smallest cooking time of 10 seconds
On standard model the two magnetrons are activated alternatively for max 30 sec.
Considering that minimum activation time for magnetron is 10 sec. the microwaves mode power is managed adjusting the activation time of the magnetron between 10 and 30 sec. and repeating this cycle on the base of 60 sec.
The magnetron can be activated for 30 sec. at a power of 100%. It is possible to reduce the activation time up to 10 sec. to achieve the power of about 30%.
In the meanwhile the heating elements are activated, depending on the mode (High Speed Oven / Combi oven) to reach the settled temperature. The system calculates and uses residual power while activating the magnetrons.
On boosted models the behavior is similar with the difference that both magnetrons are activated at the same time providing double the microwave radiation.
Heating elements are activated, depending on the mode (High Speed Oven / Combi oven) to reach the settled temperature. The system calculates and use residual power while activating magnetrons.