frequency inverter


A frequency inverter changes output voltage frequency and magnitude to vary the speed, power, and torque of a connected induction motor to meet load conditions.

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The difference between soft start and hard start of electric motor. www....

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Direct start is hard start. The starting current of hard start (direct start) is 3-7 times of the rated current of the motor. In the case of direct start (hard start), the situation of exceeding the rated current of the motor brings many restricted problems to the manufacturing process and structure of the motor itself. Because of this, people started brainstorming to solve this problem and invented soft start. Soft start, as the name suggests, is not to start directly, but to start slowly and little by little. For example, at the input end of the motor, the voltage is gradually increased from 0 to the rated voltage, and the frequency is gradually changed from 0 to the rated frequency, so that the starting current of the motor during the starting process is changed from the uncontrollable overload impulse current in the past. It becomes a controllable starting current that can be adjusted as needed. There is no impact torque in the whole process of starting the motor, but it starts and...
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ZJSHUYI An article about "soft starters". www.shuyitop.com; #softstarter

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During the starting process of the soft starter motor, the conduction angle of the thyristor gradually increases, the output voltage of the thyristor also gradually increases, and the motor accelerates from zero until the thyristor is fully turned on and the start is completed, thereby realizing the stepless smooth start of the motor. The maximum starting torque and starting current of the soft starter motor can be set according to the load. The main composition of the soft starter is a three-phase parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different methods can be used to control the conduction angle of the three-phase parallel thyristor, so that the input voltage of the controlled motor changes according to different requirements, and different functions can be realized. Soft starters and frequency converters are two completely different products. The frequency converter is used where speed regulation i...
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ZJSHUYI AC contactors often use three arc extinguishing methods. www.shu...

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AC contactors often use three arc extinguishing methods: double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated by the moving and static contacts during the opening and closing process. Contactors with a capacity of more than 10A have arc extinguishing devices. AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and terminals. The working principle of the AC contactor is to use the electromagnetic force to cooperate with the spring force to realize the connection and disconnection of the contacts. The AC contactor has two working states: de-energized state (release state) and electrified state (action state). When the attraction coil is energized, the static iron core generates electromagnetic attraction, the armature is pulled in, and the connecting rod connected to the armature drives the contact to mov...
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