Roots blower fan host ◆ host shell casing, base, wall panels, fuel tank, rotor, gray cast iron HT250 manufactured by using resin sand casting, coal washing blower, aging treatment. Surface design of the rib-like projections, not only played at a high temperature is not easy deformation, surface and increases the cooling surface area of ??the fan, the blower case design temperature of 160 ℃. Interface machined to smooth, Xi'an Roots blower assembly to ensure tightness. Roots blower inverter motor control principle is generally blower inverter motor control strategy is: the base speed with constant torque control, constant power above the base speed control, ultra-fast weak magnetic scale manipulation. Base rate: because the motor counter electromotive force when the work will occur, gas, biogas feed pressure blower, and the size is generally proportional to the speed of the back EMF. Thus when the motor work to a certain speed, because the back-emf size and size as the applied voltage, boiler air blower, now called the base rate of speed. Constant Torque Control: motor at the base speed, constant-torque control. At the moment the motor speed is proportional to the counter electromotive force E and the motor. And motor output power and the motor torque and speed proportional to the product, which at the moment is proportional to the motor power and speed. Constant Power Control: When the motor beyond the base speed, after conditioning motor excitation current to control the motor back-EMF simply adhere to stabilize, as progressive motor speed. At the moment, the motor output power simply insist on stable, but the motor torque and speed inversely proportional to the decrease. Weakening control: When the motor speed must exceed the value, the field current is now reasonably small, simply can not recuperate, now entering the field weakening control period. Conveying powder Roots blower, Roots blower Xi'an, Zhucheng East Machinery Co., Ltd. by John Han Machinery Co., Ltd. Zhucheng East. Zhucheng East Han Machinery Co., Ltd. (www.dhlcfj.com) (www.dhlcfj.com) strong, credible, Shandong Weifang fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Zhucheng East Han Machinery Co., Ltd. into the brilliant and you work for a better future!