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Some of the ways for motor control are the following: direct start, soft start, variable frequency start, star-delta start, etc. Each of the starting methods is suitable in front of different occasions and needs. In choosing the motor operating scheme, one must implement comprehensive consideration and analysis in line with the actual situation.
Here are some common startup methods:
Direct Start
The most basic starting method is the direct start, that is, the motor is directly connected to the power supply and powered on or off through a switch or contactor. The advantages are that it is very simple and easy to use, low in cost, and suitable for small power motors. However, the direct start also has its disadvantages, such as a large starting current impacting the power grid and affecting other devices’ normal operation. Simultaneously, a direct start cannot achieve soft starting and speed regulation, easily leading to mechanical impact and abrasion.
Soft start
Soft starting is the technology to control the motor in the condition of gradually increasing the voltage at the motor terminal when it starts. It normally includes high-power thyristors or other electronic components. Control of the thyristor conduction angle controls the voltage at the motor terminals during smooth start-up. The advantage of a soft start is that it can effectively reduce the starting current and reduce the impact on the power grid. Meanwhile, it can achieve a smooth start and speed control. It is suitable for high-power motors and places where smooth startup is required. However, soft-start also has some shortcomings, for example, long starting time, which cannot be able to bear frequent starting up; the cost of the soft starter itself is higher and is troublesome for maintenance.
Frequency conversion start
Variable frequency start is driving the motor’s startup, using power frequency variable rules for control. Several pieces of electronic element, for instance, high-power transistors, are adopted to implement a variable-frequency power supply capable of changing the power frequency on demand to suit the variable speed and variable power drives for motor control. The advantages compared with other forms of starters are quick response, precise control, high efficiency, energy saving, etc. It applies to any place where exact speed and power regulations are required. However, it also has some disadvantages, such as higher costs and more complicated maintenance. In addition, the output waveform of the frequency converter will affect the working performance of the motor.
Star-Delta Start
Star-delta starting is a method to control the starting of the motor by changing the connection method of the stator winding of the motor. Star connection of stator winding in starting, reducing the current during starting. When it reaches a certain speed, the motor is switched into delta to keep the motor normally running. The advantages are that the method is simple, reliable, and not expensive; it fits small power motors. However, there are also some shortcomings in star-delta start, mainly reflected in that it cannot achieve smooth start and speed regulation and can easily cause mechanical impact and wear in the process of use.
Motor control technology may have the following new development trends in the future:
Intelligence and automation: With the rapid development of artificial intelligence and automation technology, motor control technology will develop in an intelligent and automated direction. In the future, the motor control system should be more intelligent, independently making adjustments or optimizations according to different conditions to improve production efficiency or work quality.
High efficiency and energy saving: The development of the motor control system in the direction of high efficiency and energy saving has been driven by the energy crisis and increasing environmental protection consciousness. In the future, more efficient motors and frequency converters will be used in the motor control system to reduce energy consumption. Simultaneously, it will maximize motor efficiency through optimized control algorithms and an energy-saving strategy to reduce energy consumption.
Integrated development: With the factories providing more and more complicated new products, their need for motor control systems will continue to increase. Shortly, the whole development of motor control systems will be more integrated. A more integrated electronic control product, in some way, is to simplify the wiring process or other operations. Based on such a trend of integrative development, it can help an elevator quickly connect the network to offer better product applications.
Intelligent networking: It could be said that intelligent networking will be inevitable in the developing trend of a future motor control system, and the remote control system will be intelligently used in motor control. This economized motor control system can automatically collect changes in the inside status, record them, and then send the real-time data to the customer’s terminal for any consumer to timely and accurately observe the controlling system of a motor. It detects operation status to provide operating motors or fault screening.
In this aspect, ENNENG fully meets the development toward the future trend.
The major activity of ENNENG is the R&D of a series of permanent magnet motors. It provides precise motor control and various start-up methods according to requirements.
Motor control may be explained as the regulation of speed, torque, and direction of the motor. ENNENG‘s permanent magnet motors are incomparable for accurate and efficient control of the operation of motors.
The startup methods of their motors include, among others, DOL starting, soft starting, and VFD starting. DOL involves a simple connection of the motor to the mains supply; on the other hand, the soft start-up increases the voltage and frequency gradually to minimize the inrush current and mechanical stresses at startup. VFD startup allows for very precise control of the motor speed and torque by varying the frequency and voltage applied to the motor.
As part of power machines, ENNENG’s permanent magnet motors apply to different industries and find wide applications in gold mines, coal mines, tire factories, oil wells, and water treatment plants. They come out very reliable and energy-saving; therefore, they come in to give quite enviable benefits power saving, and also helping with environmental protection.
The motors of ENNERG are permanent magnet-driven and controlled with precision, having numerous startup methods. With their extensive applicative range and energy-efficient emphasis, these surely provide dependability and sustainability in various applications.
