single-phase variable frequency drives

Shop for single-phase variable frequency drives (VFD) with our range of products by Schneider Electric, Square-D, and LSIS. Place your order today!


What Are the Single-Phase Variable Frequency Drives and When Should They Be Used?

Single-Phase variable frequency drives (VFDs) are devices that are used to regulate the speed of single-phase motors. In simple terms, VFDs adjust the frequency of the electrical power supplied to the motor, which in turn controls the single-phase motor speed. Single-Phase VFDs are becoming increasingly popular due to their cost-effectiveness and versatility, making them a popular choice for many applications.

Single-Phase Electric Power

Single-Phase electric power is a type of electrical power transmission that is commonly used in smaller operations. Single-Phase power has a voltage wave that oscillates between zero and the peak voltage, with a single cycle typically taking about 16.67 milliseconds. There are several advantages to using Single-Phase power over three-phase power, including simplicity and cost-effectiveness.

What Is the Single-Phase Variable Frequency Drive?


A Single-Phase Variable Frequency Drive (VFD) is a device that can convert Single-Phase power to variable output frequency and voltage output. This technology can control the speed and torque of an AC motor without the need for a traditional motor starter. Single-Phase VFDs are commonly used in HVAC applications, pumps, fans, and other industrial applications where precise speed control over the motor is necessary.

Single-Phase variable speed drives work by converting Single-Phase AC voltage to DC voltage, then back to AC voltage. The drive converts the incoming power supply to a higher frequency output, which is controlled by a microprocessor-based controller. This allows the motor speed to be easily adjusted based on the single-phase application's needs.

Single-Phase VFDs have several advantages, including energy savings, motor protection, and precise control over motor speed. Single-Phase VFDs also have a smaller footprint compared to three-phase VFDs, making them a more practical solution in motor applications with limited space.

Single-Phase variable speed drive is commonly used in a variety of applications, including:

  • HVAC systems
  • Pumps
  • Fans
  • Compressors
  • Conveyors
  • Mixers
  • Agitators
  • Machine tools
  • Food processing equipment

When to Use a Single-Phase Variable Frequency Drive

Single-Phase Variable Frequency Drive

When choosing a VFD, several factors must be considered, including the application, the motor size, and the available power supply. Single-Phase VFDs are best suited for applications that require precise control over motor speed and torque, such as HVAC systems, pumps, and fans.

Single-Phase VFDs are also a cost-effective solution for small businesses and homeowners who want to reduce installation & maintenance costs.

While Single-Phase VFDs have several advantages over three-phase VFDs, they may not be the best solution for every application. In some cases, a three-phase VFD may be necessary, such as in applications with larger three-phase motors or more complex control requirements.

Several industries use Single-Phase VFDs to optimize their operations, including HVAC, pumps, conveyors, and other industrial applications. Small businesses and homeowners can also benefit from Single-Phase VFDs in applications such as pool pumps, air conditioning compressors, and other household appliances.

Single-Phase VFD Stock at Blackhawk Supply

Blackhawk Supply has a wide range of Single-Phase Variable Frequency Drives in stock from three major manufacturers - Schneider Electric, LSIS, and Square-D. The available AMPs range from 0.8 to 69, and various options are available such as Altivar 12, Altivar 320, and HP. The stock includes different housing options such as IP20 and NEMA 1 and models like H100, M100, and S100. The available voltage options are 115V, 120V, 200-240V, and 240V. With such a diverse collection of products, the Blackhawk Supply store can provide a single-phase VFD for any kind of application.


Single-Phase variable frequency drives (VFDs) are devices that regulate the speed of single-phase electric motors by controlling the frequency of the motors' electrical power supply. Single-Phase VFDs are less expensive than three-phase VFDs and are suitable for smaller applications where the motor horsepower rating is relatively low.

Single-Phase VFDs are a valuable tool in controlling the speed of single-phase electric motors. They offer precise control, energy efficiency, and improved motor life, making them an attractive option for many applications. When choosing VFDs, it's essential to consider factors such as the motor horsepower rating, the load requirements, the operating environment, and the application's control requirements.

If you're looking for Single-Phase VFDs or any other HVAC or electrical equipment, Blackhawk Supply has you covered. Check out our wide selection of products and place your order today!

Committed to customer satisfaction
as experts in Single-Phase Variable Frequency Drives