There are three types of motor inverters
●Ordinary function type. The fundamental V/F frequency conversion speed regulation function, speed regulation accuracy and torque control function requirements are not high for general use can be satisfied.
●High function type. V/F frequency conversion speed regulation with torque control function, and constant torque load of hoist is widely selected.
●Vector control or direct torque control type. It is necessary to choose vector control inverter for high-performance applications such as steel rolling and papermaking that require high dynamic functions.
The use of frequency converters
In the era when the inverter technology is not yet mature, most of the fans and pumps used in high-performance use are pole-changing multi-speed three-phase asynchronous motors, but because they are step-by-step speed regulation, they cannot do wide-scale smooth speed conditioning, let alone function optimization. Now the inverter is very widely used, and the inverter motor specially used for the load of fans and pumps has been planned and optimized, and the electrical functions such as speed regulation scale efficiency and power factor can be maintained at a high level.
Triple jump of load or output conditioning of fans, pumps, etc
● Traditional conditioning methods. After adjusting the baffle of the inlet or outlet and the opening of the valve to adjust the air supply and water supply, the input power is large, and a lot of energy is consumed in the interception process of the baffle and valve.
●Pole-changing multi-speed three-phase asynchronous motor has stepwise speed regulation. When running at full load, the pole-changing multi-speed three-phase asynchronous motor runs at high speed; The air volume or water supply needs to be adjusted to an hour, and the motor is converted to medium or low speed operation, and the input power is greatly reduced, achieving an extremely significant energy saving effect.
●Frequency conversion speed regulation, three-phase asynchronous motor, stepless speed regulation. When using frequency conversion speed regulation, if the flow requirement is reduced, the speed of the descending pump or fan can meet the requirements. Generally, the special inverter motor used has the optimal functional index within the wide speed regulation scale, and the ratio of "flow/energy consumption" has been maintained at a high level.
Soft start and permanent magnet synchronous frequency conversion application
The asynchronous motor is driven by an inverter, which not only completes the stepless speed regulation, but also controls the starting current of the motor within the scale of less than 2 times the rated current, and the starting torque can also reach about 2 times the rated torque. Therefore, there is no starting problem for the inverter-driven three-phase asynchronous motor, and the high-performance soft start is its innate characteristic.
High-performance permanent magnet synchronous motors, such as permanent magnet motors for new energy vehicles and permanent magnet motors for ship drives, are all driven by inverters, which are generally special drive power modules with a high degree of integration, which are integrated with the motor body to form a permanent magnet synchronous motor system.
Inverter drive has broadened the application field of motors, and many planning taboos have been broken because of this, such as low-speed direct-drive wind turbines as low as tens of revolutions and hundreds of revolutions, high-speed direct-drive spindles up to tens of thousands of revolutions, and special motors for automobile drives. With the promotion of application and the continuous refinement of professional needs, the inverter for motor will develop in the multi-dimensional direction of high-performance general-purpose, special-purpose mechatronics and intelligent manufacturing high-end application, and promote the continuous transformation and promotion of motor planning concept and motor production.
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