Now, the frequency conversion speed regulation system has been widely used in the industrial production of various small and medium-sized enterprises. This is all due to our ability to provide accurate speed control and complete stepless speed regulation. Therefore, it can easily control the upward movement, descent, traversing and other operation actions of the mechanical transmission, improve the efficiency of the process (the speed change does not depend on the mechanical part), and is more energy-efficient than the traditional motor running at a constant speed. Here are 10 reasons to use inverter speed regulation in production activities:
(1) Control the starting current of the motor to complete the soft start.
When the motor is directly started with industrial frequency, the starting current is 4-7 times of the rated current of the motor. Excessive current will add electrical stress to the motor windings and generate heat, which will shorten the life of the motor. The inverter (hereinafter referred to as -VFD) selects the variable frequency speed regulation skill, which can drive the load according to the V/F or vector control method. The selection of frequency conversion speed regulation can abundantly reduce the starting current, improve the bearing capacity of the winding, and reduce the impact of mechanical equipment, failure rate and equipment protection cost.
(2) Reduce grid voltage fluctuation and grid pollution.
When the motor is started at power frequency, the current increases dramatically and the voltage fluctuates dramatically. The magnitude of the voltage drop will depend on the power of the starter motor and the capacity of the distribution network. Voltage drops can cause voltage-sensitive devices in the same power supply network to trip or operate abnormally, such as PCs, sensors, proximity switches, contactors, etc. However, after the inverter drive plan is selected, because it can be started step by step at zero frequency and zero voltage, the fluctuation of grid voltage can be eliminated to a large extent.
(3) The power required for power generation is low, which reduces the capacity requirement of the power grid.
The power of the motor is proportional to the product of current and voltage, so the power consumed by the motor directly powered by the frequency will be much higher than the power required for frequency conversion. Under some working conditions, its power distribution system has reached the limit of excellence, and the surge of its direct power frequency starter motor will have a serious impact on other users in the same network, and will be warned or even fined by the power grid operator. If a VFD is used to start and stop the motor, this problem can be improved.
(4) Controllable acceleration of function and improvement of equipment working conditions.
The frequency conversion speed regulation can start from zero speed, and accelerate evenly according to the user's needs, and its acceleration curve can also be selected (straight line acceleration, S-shaped acceleration or automatic acceleration). If the shaft or gear of the motor or the connected mechanical part will oscillate violently when the power frequency is started, this oscillation will further aggravate the mechanical wear and loss, and reduce the service life of the mechanical part and the motor.
(5) The running speed is adjustable to improve product quality.
The variable frequency speed regulation plan optimizes the process flow and can change quickly according to the process flow. It can also complete intelligent speed control through remote control PLC or other manipulators to complete the optimized processing effect.
(6) Adjustable torque restraint to provide equipment protection.
After frequency conversion speed regulation, the corresponding torque limit can be set to protect the machinery from damage, so as to ensure the continuity of the process and the reliability of the product. Now the frequency conversion skill not only makes the torque limit adjustable, but also the torque control accuracy can reach about 3% - 5%. In the power frequency state, the motor can only be controlled by detecting the current value or thermal protection device, and the accurate torque value cannot be set like the frequency conversion control.
(7) Controllable shutdown form to complete precise control.
Just like controllable acceleration, in frequency conversion speed regulation, the abort method can be controlled, and there are different abort methods to choose from (deceleration stop, free stop, deceleration stop + DC braking). Similarly, it reduces the impact on mechanical components and motors, making the entire system more robust and extending its service life accordingly.
(8) Reduce energy consumption and complete energy-saving operation.
The use of VFDs for secondary loads such as centrifugal fans or water pumps can significantly reduce energy consumption, which has been demonstrated in more than ten years of engineering experience. Because after all, energy consumption is the square ratio of the motor speed, and the return on investment will be faster after frequency conversion. ※.
(9) The running direction of the equipment is reversible, and it is easy to complete the forward and reverse operation.
In VFD control, the reversible operation control is completed, no additional reversible control devices are required, and only the phase sequence of the output voltage needs to be changed, which can reduce the protection cost and save the installation space.
(10) Reduce mechanical transmission parts and optimize the architecture.
Now the old drive motor of vector control inverter can complete high-efficiency torque output, so as to eliminate mechanical transmission components such as gearboxes, and finally form a direct frequency conversion transmission system.
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