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Soft Starter Manufacturers From China - China

price: contact company for price

The soft Starter

used to slowly

ramp up a motor to full speed, and/or slowly ramp down the motor to a

stop. To reduce both current draw and the mechanical strain on the

system, soft starters are used in place of contactors. By providing

smooth acceleration and deceleration of the load, soft starters are able

to reduce wear on belts, gears, chains, clutches, shafts and bearings.

Many large pumps and fans require at least a 30-second ramp time to

prevent mechanical damage to the system. Typically, soft starters are

more common on larger horsepower systems. They are often critical for

applications where an abrupt stop of the load may cause system or

product damage.

Adding a soft starter to the bypass allows the motor to be ramped up to full speed, thus reducing the mechanical and electrical stress on the system.

As you can see, each type of starting controls the voltage to the motor. In order to do this, the soft-start chops up the sine wave, changing AC voltage to DC voltage and then back to AC voltage. As the sine wave is being chopped up, it is creating harmonic currents.

If we apply a capacitor to this motor circuit, the capacitor becomes the lowest impedance in the motor circuit. When this happens, most of the harmonic currents will flow to the capacitor, causing the capacitor to draw more current than it normally would. Consequently, the capacitor fuses will blow or the capacitor cell itself will fail. So how do we keep the capacitor from doing this?

When we look at soft starters, the time it takes to reach full speed can be anywhere from 0 to 30 seconds. So what we need to use is a capacitor with a contactor (See figure below). When the startup is complete and the 'up to speed' signal is energized, then we can energize the capacitor contactor. This will keep the soft-start harmonic currents from your capacitor.


Company Contact:


  • Phone: 8613928480245

  • Address: Building 2 Xuwu Gongle Xixiang, Bao'an District Sh, Shenzhen, China

  • Email: Email


Published date: October 16, 2013 -

  • Business Description: A soft starter is a device used to reduce inrush current to reduce the

    load on a motor's electrical circuits. Inrush current is the initial

    surge of current into the windings that is required to overcome inertia

    during motor startup. A soft starter provides protection to machines

    with high inertia. It slowly ramps up the speed, which prevents

    overheating or stress on parts of the motor.

    Soft Starters has been designed to drive three phase three wire squirrel cage induction motors. It s also possible on STE family to drive motor with 6 wire connection to reduce the circulating current inside STE. Three different family are available.

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