VFD Variable Frequency Drives
RSP Supply carries a full line of variable frequency drives (VFDs) designed for precise motor control, optimized speed regulation, and improved energy efficiency in industrial and commercial systems. VFDs adjust the power supplied to AC motors, allowing for exact control of speed and torque, making them essential in processes that require accuracy, reliability, and performance. These intelligent motor controllers not only enhance productivity but also significantly reduce energy consumption and equipment stress, extending the life of both motors and mechanical components such as pumps, gears, and fans.
At RSP Supply, we understand that every application has unique demands -which is why we carry a full range of trusted VFD brands to fit your exact needs. Our lineup includes ABB, Benshaw, Danfoss, Eaton, NAE, Schneider Electric, Toshiba, and Yaskawa, along with VFD cables and accessories to complete your setup. Whether you’re upgrading an existing setup or designing a new one, our team can guide you to reliable, high-efficiency solutions that make a measurable difference in your operation.
Partner with RSP Supply to get dependable products, expert support, and long-term value for all your motor control needs.
ABB VFDs
Benshaw VFDs
Danfoss Vacon VFDs
Danfoss VFDs
Eaton VFDs
NAE VFDs
Schneider Electric VFDs
Toshiba VFDs
Yaskawa VFDs
VFD Cables
FAQs
Can the output voltage of a variable speed drive provide enough constant torque to control an induction motor?
Yes, the output voltage of a variable speed drive can provide enough constant torque to control an induction motor effectively.
Do medium voltage AC drives have insulated gate bipolar transistors?
Yes, medium voltage AC drives often use insulated gate bipolar transistors (IGBTs) for efficient and precise control of motor speed and torque.
What kind of energy consumption does variable speed drives and motor controllers have?
Variable speed drives and motor controllers typically have lower energy consumption compared to traditional fixed-speed motor controllers, as they adjust the motor's speed and torque to match the load requirements, optimizing energy use.
Do single phase DC drives provide enough torque control to increase productivity and performance of an industrial machine?
Yes, single-phase DC drives provide sufficient torque control to enhance productivity and performance in industrial machines by delivering precise speed regulation, smooth acceleration, and efficient power management.
Motor Starters, Soft Starters and VFDs
Motor Starters
Motor starters safely start and stop a motor in industrial applications. They are designed with a contactor, overload and circuit protection. They are used when basic motor control is required, where torque on the motor is not a concern and speed control is not needed. The advantages of motor starters include: lower cost, allows for remote operation, allows for monitoring of motor state (with the use of auxiliary contacts) and they are safe and efficient. The disadvantages include: high inrush current that can cause fuses to blow and breakers to trip if the inrush is too high, and the starter will allow a full torque to start the motor which can cause the motor to ramp up to full speed very quickly potentially causing the motor to wear and degrade prematurely.
Soft Starters
Soft starters protect motors from inrush current by gently ramping up the motor to full speed. They provide all of the same functions as a traditional motor starter. The advantages of soft starters include: they are less expensive than a VFD when only startup control is needed, they are a smaller system than a VFD where space is a concern and they prevent unwanted torque upon startup, prolonging the life of the motor. The disadvantages include: they are more expensive than a traditional motor starter and they do not allow for full speed control.
VFDs
A Variable Frequency Drive (VFD) allows for the slow ramp up of a motor during startup and the slowing down of the motor during shutdown. It also allows for full speed control during the entire run cycle of the motor. VFDs provide the same functions as both the traditional motor starters and soft starters. The advantages of VFDs include: full speed control (start, stop and in-between), more custom control and monitoring, energy savings due to efficient motor usage and less wear and tear on the motors. The disadvantages include: they are more expensive and larger than other motor control options and they generate heat that may require fans or AC units.