How to choose a variable frequency drive?

The variable frequency drive generally chooses a 4-level motor, the base frequency operating point is designed at 50Hz, the frequency is 0-50Hz (speed 0-1480r/min) The motor runs at constant torque, and the frequency is 50-100Hz (speed 1480-2800r/min). The motor runs at constant power within the range of min), and the entire speed regulation range is (0-2800r/min), which basically meets the requirements of general drive equipment. Its working characteristics are the same as those of DC speed regulation motors, and the speed regulation is smooth and stable. If you want to increase the output torque within the constant torque speed regulation range, you can also choose a 6-level or 8-level motor, but the size of the motor is relatively larger.

Since the electromagnetic design of the variable speed drive uses flexible CAD design software, the fundamental frequency design point of the motor can be adjusted at any time, and we can accurately simulate the working characteristics of the motor at each fundamental frequency point on the computer. The constant torque speed regulation range of the motor has been expanded. According to the actual working conditions of the motor, we can make the power of the motor larger in the same frame size, or we can use the same inverter on the basis of the motor. The output torque of the motor is improved to meet the requirements of the design and manufacture of the motor in the best state under various working conditions. The frequency conversion motor can be optionally equipped with an additional speed encoder, which can achieve the advantages of high-precision speed, position control, and fast dynamic response. It can also be equipped with a special DC (or AC) brake for the motor to achieve fast, effective, stable and reliable braking performance of the motor.

With the basic frequency adjustability design of the variable frequency drive, we can also manufacture various high-speed motors, which maintain constant torque characteristics during high-speed operation, which can replace the original intermediate frequency motor to a certain extent, and the price is low. The variable frequency speed regulating motor is a three-phase AC synchronous or asynchronous motor. According to the output power of the inverter, there are three-phase 380V or three-phase 220V, so the motor power also has different differences between three-phase 380V or three-phase 220V. Generally, inverters below 4KW have three-phase 380V or three-phase 220V. Phase 220V can be used. Since the frequency conversion motor is divided into different constant power speed control areas and constant torque speed control areas based on the fundamental frequency point (or inflection point) of the motor, the setting of the fundamental frequency point and the frequency converter is very important.

The source manufacturer of Dolycon vector inverter, the raw materials are directly purchased from the primary source of the big-name manufacturers, and the manufacturing cost is reasonably controlled. The inverters all use imported brand components to meet the strict application requirements of domestic and foreign users. It supports the curing of non-standard parameters of the inverter software, which effectively simplifies the debugging process of customer equipment. Welcome to consult.