Beijing Sanken SPF converter sales maintenance Sanken inverter prices Inverter model

Beijing Sanken SPF converter sales maintenance | three are willing to drive prices | inverter model inverter current flows in the power factor correction capacitors, due to the charging current causes the inverter overcurrent (OCT), so we can not start, as a countermeasure, Please capacitor after the removal operation, as to improve the power factor at the input side of the inverter access AC reactor is effective. For small capacity but also whether the cooling fan of the aircraft. A fan of the aircraft, the wind direction is from the bottom up, so the installation of the drive where the upper and lower do not put impede suction and discharge of machinery and equipment. Also, do not place the top of the drive span of parts. When a fan fails, the fan stop detection or overheat detection to protect the cooling fan on the filter capacitor used as a capacitor, its capacitance over time and slowly decrease, periodically measuring electrostatic capacity to meet product rated capacity as a benchmark to determine the life of 85%. ?? Converter is usually divided into four parts: the rectifier unit, high-capacity capacitors, inverters and controllers. Rectifier unit: The fixed frequency alternating current is converted to direct current. High capacitance: a converted power storage. Inverter: the high-power switching transistor array composed of electronic switches, the direct current is converted to a different frequency, the width, the amplitude of the square wave. Controller: work according to set procedures, controlling the amplitude and pulse width square wave output, making an approximate sine wave superimposed AC, AC motor drive. Vector Control approach is three-phase asynchronous motor in the coordinate system of the stator current Ia, Ib, Ic, by a three-phase - two-phase conversion, equivalent to a two-phase alternating current Ia1Ib1 stationary coordinate system, and through rotating rotor flux oriented transformation into a direct current Im1 equivalent synchronous rotating coordinate system, It1 (Im1 equivalent DC motor excitation current; It1 equivalent proportional to the torque armature current), then imitate the DC motor control method, seek to control the amount of DC motor via the corresponding coordinate inverse transform, to achieve the asynchronous motor control. Its essence is the equivalent AC motor DC motor speed respectively, independent control of the two components of the magnetic field. By controlling the rotor flux and the stator current decomposed to obtain torque and magnetic fields of the two components, the coordinate transformation, achieve orthogonal or decoupling control. Proposed vector control method of epoch-making significance. However, in practice, since the rotor flux it is difficult to accurately observing system greatly influenced by the characteristics of the motor parameters and the equivalent DC motor control used in the process is more complex vector rotation transformation, so that the actual effect is difficult to achieve the desired control analysis Results. The fourth-generation direct torque control (DTC) mode: In 1985, Germany's Ruhr University professor DePenbrock first proposed direct torque control inverter technology. This technology largely solves the problem of the above-mentioned vector control, and control to new ideas, concise system architecture, excellent static and dynamic performance has been developing rapidly. The technology has been successfully applied on electric locomotive traction power AC drive. Direct Torque Control of mathematical model of AC motors directly in the stator coordinate system, control motor flux and torque. It does not require the equivalent AC motor DC motor, thus eliminating many complex calculations vector rotation transformation; it does not need to imitate the DC motor control, no need for the decoupling and simplified mathematical model of AC motor. Beijing Sanken SPF converter sales maintenance | three are willing to drive prices | inverter model?