In today’s era of industrial automation, manufacturers demand smarter, more efficient control systems for smaller equipment.Single Phase Variable Speed Drives (VSDs) — also known as…
In today’s era of industrial automation, manufacturers demand smarter, more efficient control systems for smaller equipment.
Single Phase Variable Speed Drives (VSDs) — also known as Single Phase Variable Frequency Drives (VFDs) — allow precise speed control, energy efficiency, and torque regulation for light to medium-duty applications powered by Single Phase 240V.
At Venus Automation, we specialise in reliable AC drives, soft starters, and motor controllers from leading global brands like Mitsubishi, ABB, Schneider Electric, Invertek, and Danfoss. Our range helps Australian industries achieve consistent performance, reduced downtime, and measurable energy savings.
What Is a Single Phase Variable Speed Drive?
A Variable Frequency Drive (VFD) converts a fixed-frequency AC power supply into a variable-frequency, variable-voltage output that precisely controls motor operation.
By adjusting both the input voltage and output frequency, the drive enables smooth control of single-phase induction motors and small three-phase motors, ensuring maximum efficiency and extended equipment life.
Unlike conventional on/off motor starters, VFDs allow gradual acceleration, improved torque control, and seamless speed adjustment through digital settings, analog inputs, or serial communication control.
Read more about how these systems differ in our article on Variable Speed Drives Explained.
How Single Phase VSDs Work
Single-phase VSDs perform three main functions:
-
Rectification: Incoming AC power is converted to DC and stored in a DC bus.
-
Inversion: The drive’s inverter section transforms DC back into adjustable-frequency AC voltage for fine motor control.
-
Feedback and Control: Internal processors use PID control and sensorless vector control to maintain accurate speed and torque under varying loads.
This process minimizes mechanical wear, prevents overcurrent faults, and ensures stable performance across different motor applications.
Key Features of Single Phase Variable Frequency Drives
1. Built-In PID and Simple PLC Control
Modern drives such as the Mitsubishi FR-D700 Series and ABB ACS150 include built-in PID and simple PLC logic, allowing multi-step speed programming without external controllers.
This built-in functionality simplifies automation design and improves responsiveness in smaller machines.
2. Sensorless Vector Control
Advanced Sensorless Vector Control ensures stable torque response even at low speeds, maintaining accuracy across varying load profiles.
This makes single-phase drives suitable for power tools, compressors, and fans, as well as integration with Servo Motors and Servo Drives & Controls.
3. Compact Design and IP-Rated Protection
Models like the Mitsubishi FR-D720-2.2K and FR-D740-012-EC offer IP55 or IP66 protection, Class F insulation, and conformal coating, ideal for harsh industrial or outdoor installations.
They integrate seamlessly with Operator Interfaces and compact control cabinets.
4. Energy Efficiency and Cost Savings
By dynamically matching motor output to demand, single-phase VSDs significantly reduce energy consumption.
Combined with high-quality Wipos Power Supplies, they deliver consistent voltage, improve power factor, and minimise electrical energy waste — resulting in long-term energy savings and lower operating costs.
5. Reliable Motor Protection
Each drive features built-in overload capacity, motor thermal protection, and automatic fault reset.
When integrated with Power Relays, Safety PLCs, or Safety Relays, they ensure comprehensive protection and operational reliability.
Applications of Single Phase Variable Speed Drives
Pumps and HVAC Systems
In pump systems and HVAC setups, single-phase drives maintain constant pressure, adjust flow rates, and prevent sudden starts that can damage motors.
Their PID functionalities and analog setting options allow precise control while achieving measurable energy efficiency.
They’re frequently paired with Time Delay Relays and Industrial Socket Outlets for safe and coordinated operation.
Machine Tools and Workshop Equipment
For lathes, mills, and drill presses, VSDs deliver reliable speed control, smoother acceleration, and reduced mechanical strain.
Using Soft Starters alongside the drive further improves system longevity and operator safety.
Food and Packaging Equipment
In food processing machines, drives manage conveyors, dosing equipment, and agitators with stable output frequency and torque control.
Integrating Safety Light Curtains and Safety Interlocks ensures compliance with machine-safety standards.
Agricultural and Farm-Duty Motors
For irrigation pumps, feed conveyors, and ventilation fans, single-phase drives replace bulky phase converters, offering easy installation and high reliability under fluctuating loads.
Rugged options like the Invertek Optidrive E3 and Danfoss TECDrive handle variable weather and dust conditions efficiently.
OEM and Compact Automation
OEM engineers use compact AC drives to save cabinet space and reduce wiring complexity.
Our Compact Variable Speed Drives provide scalable solutions for embedded and modular automation systems.
Popular Single Phase Drive Models
-
Mitsubishi D700 Series – Dual-rated AC variable speed drive with easy setup and integrated PID control.
-
ABB ACS150 – User-friendly with multi-step speed setting and sensorless vector control.
-
Schneider Altivar ATV12 – Energy-efficient with excellent torque performance and communication control.
-
Invertek Optidrive E3 – IP66-rated, versatile for workshops and food plants.
-
Danfoss TECDrive AC VFD – Compact and compliant with IEC Standard for reliable industrial use.
Browse our complete Automation Products catalogue for compatible accessories, drives, and spare parts.
Benefits of Single Phase Variable Speed Drives
-
Up to 50 % energy savings in pump and fan applications
-
Reduced maintenance costs and improved uptime
-
Enhanced motor torque control and smoother operation
-
Compact size for smaller cabinet installations
-
Advanced communication control via RS-485 or Modbus
-
Full compatibility with Safety Control Units, Safety Enabling Switches, and Emergency Stop Relays
-
Extended motor life through gradual acceleration and braking
Selecting the Right Single Phase Drive
When selecting your Single Phase VSD, consider:
-
Motor type – single-phase induction or three-phase motor
-
Input voltage and output frequency range
-
Horsepower rating and Full Load Amps (FLA)
-
Torque requirements and load conditions
-
Environmental protection (IP55, IP66) and ambient temperature limits
-
Control terminals and communication settings for integration
Our experienced Customer Service team can recommend the ideal drive configuration for your exact motor application and system environment.
Integration and Communication
Our drives are easily integrated with:
-
HMI Touch Panels for local control
-
Power Supplies for stable current
-
Servo Motors and Safety PLCs for higher-level automation
-
Soft Starters for multi-motor applications
-
Safety Relays for emergency fault isolation
Together, these components form a cohesive automation ecosystem that enhances reliability, safety, and control flexibility.
Why Choose Venus Automation
Venus Automation is Australia’s trusted supplier of Variable Frequency Drives, Soft Starters, and Motor Control Products.
We provide:
-
Expert product selection advice and engineering support
-
Training programs for installers and system designers
-
Fast nationwide delivery and exclusive discounts
-
Transparent warranty policies and dedicated after-sales service
Our mission is to help businesses achieve safer, smarter, and more efficient automation through quality hardware and technical excellence.
Single Phase Variable Speed Drives offer a reliable, efficient, and compact solution for modern industrial automation.
Whether powering fans, pumps, or machine tools, they deliver smooth speed control, energy efficiency, and robust motor protection.
From Mitsubishi FR-D700 to ABB ACS150 and Schneider ATV12, Venus Automation provides the products, expertise, and support to keep your systems running efficiently — enhancing productivity, sustainability, and safety across Australia’s industries.
