Inverter Drives

At YESSS Electrical, we stock a vast range of Variable Frequency Drives of all different power ratings and supply voltages to suit a variety of different applications. 

Variable Frequency Drives (VFD’s), also recognised as AC drives, Inverters and Variable Speed Drives (VSDs), are devices that electronically convert fixed voltage fixed frequency into variable voltage variable frequency to control the speed and torque of AC induction motors. 

Our diverse collection of Variable Frequency Drives includes products from LS Electric. The inverter drives we supply from stock are available in sizes from 0.4kW all the way up to 90kW and beyond on request. 

Inverter drives are used in a range of different industries, such as heating and ventilation, industrial, energy and hospitality. They are frequently used in systems like refrigeration, pumps and fans. The enhanced control that variable frequency drives provide can help to enable significant energy savings; for example, when installed on a compressor they are much more efficient than fixed speed compressors which provide only ON/OFF command and valve control. 

Take a look at our extensive range of inverter drive systems or contact us today to find out more about inverter drivers.


How does a Variable Frequency Drive work? 

A variable speed drive works by converting a motor’s fixed incoming electrical supply into a variable frequency output. This way the inverter drive can control the motor speed. 

What is the difference between a Soft Starter and a Variable Frequency Drive? 

Both of these devices can only be used on AC motors. The difference between a soft starter and a variable frequency drive is that the soft starter is designed to start or stop a motor under reduced starting torque and current by varying the motors supply voltage from minimal to full rated value. When the motor reaches its designed operating speed, the soft starter has done its job and the motor must be switched to the mains power supply. Meanwhile, variable frequency drives control a motor’s operating speed by changing both its applied voltage and its frequency; the VFD can be left in circuit to operate the motor continuously and efficiently. 

How does a variable frequency drive save energy?

Variable Frequency Drives can save energy by altering the speed at which motors operate. This can result in less energy consumption; it can also help to preserve the life of your motor as it won’t have to work as hard when lower speed rates are set. When connected to a centrifugal fan or pump motor for example, reducing the frequency (motor speed) by 20% will normally save around 50% of its consumed energy when compared to operating the motor at 100% speed and reducing the air or liquid flow from the fan or pump by partly closing a damper or valve.