FOC has the characteristics of smooth operation and fast transient response of the motor in the entire AC motor control technology.
Assuming that the motor we have on hand is a two-phase or three-phase DC motor, then we only need to control the three-phase sinusoidal current (phase difference 1209) leading to the stator winding in real time, and a rotating magnetic field will be generated inside the stator, as shown in the animation on the left.
From the animation in the middle, we can see that if we place the rotor embedded with permanent magnets inside the stator at this time, then due to the mutual attraction between the generated rotating magnetic field and the magnetic field of the permanent magnets inside the rotor, the rotor will start to rotate under the driving of the rotating magnetic field.
As shown in the animation below, the black rotation vector is the direction of the resultant stator flux linkage.

Small size, high power;

The product can meet the long-term power, and because of the use of metal resistance core, can withstand the peak pulse and periodic pulse conditions, while achieving small size and lightweight;

High pressure resistance, can be customized on demand;

The resistance value of the resistor can be adjusted in a wide range: 0~100 Ω;

Low change rate of resistance in hot state: the resistance sheet is made of alloy foil with low temperature coefficient, and the change rate of resistance in hot state may not be higher than 10%;

Good heat dissipation: the use of high heat dissipation medium heat conduction, can also be matched with water cooling plate or air cooling environment can be restored to normal temperature in a very short time;

Strong corrosion resistance: the resistance sheet is made of alloy foil material, and the shell can be formed by 96% alumina isostatic pressing, which has strong corrosion resistance;

Module connections: The power and short-time withstand energy requirements can be adjusted by adding or reducing resistor modules.

The resistance module can be expanded to form a resistance box through series and parallel connection. The representative descriptions of 3 models are as follows:

The resistance box is used for the braking resistance of military ships. The cooling adopts water cooling to dissipate heat of the resistance module, and the cooling medium is purified seawater;

The resistance box is made of 6 series aluminum, 316 stainless steel, titanium alloy and other materials to effectively prevent corrosion in the harsh salt spray environment at sea;

The unique system design has the characteristics of high energy density, high heat dissipation efficiency, and low operating temperature rise;

The resistance box meets the requirements of military standards such as GJB 150A-2009 "Environmental Experimental Methods for Military Equipment Laboratory", GJB 202A-1998 "General Specification for Power Distribution Devices and Control Devices for Ships", and GJB4000-2000 "General Specification for Ships.

Based on the above, our company is in the leading position in the industry in the field of high-power resistor design, in the application of various heat dissipation conditions and more new materials, and can customize various adaptive products for customers.