What is the Difference between VFD and Soft Starter?
In this video, we will look at the internal workings of the devices, how to determine which device you might want, and look at some applications to better understand these differences.
Let’s first talk about the internal working of the two devices. A typical three-phase soft starter uses six Thyristors or Silicon Controlled Rectifiers, oriented in an anti-parallel configuration to start the electric motors smoothly.
A Thyristor is made up of 3 parts; a logic gate, a Cathode, and Anode. When an internal pulse is applied to the gate it allows current to flow from Anode to Cathode which then sends current out to our motor.
When the internal pulses do not apply to the gate, the SCRs are in the OFF state and therefore they restrict the current to the motor.
These internal pulses limit the applied voltage to the motor slowing down inrush current. The pulses are sent based on ramp time so the current will be slowly applied to the motor.
The motor, attached to the soft starter, will start up at a nice smooth current and top out at the preset maximum speed.
The motor will stay at that speed until we stop the motor where the soft starter will ramp down the motor in a very similar way as the ramp up.
VFD’s have three main components, a Rectifier, a Filter and an Inverter.
The Rectifier acts like Diodes, takes the incoming AC voltage and changes it to DC voltage.
Next, the Filter uses Capacitors to clean the DC voltage making it a smoother incoming power.
Finally, the “Inverter” uses transistors to convert the DC voltage and sends the motor a frequency in Hertz.
ما هو الفرق بين VFD و Soft Starter؟
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18 июл 2023
