Choosing the Right Solution for Industrial Motors

Motor control is a critical factor in industrial efficiency. Selecting the right solution can improve equipment longevity, reduce energy consumption, and minimize downtime.

We at Solcon-IGEL see the advantages of soft starters in a wide range of industrial applications, and understanding how soft starters compare with VFDs (variable frequency drives ) will help you decide which approach works best for your operations.

Soft Starter Overview
Soft starters are designed to control motor voltage during startup and (in some models also to shutdown).

Once the motor reaches full speed, they bypass themselves, so the motor runs independently at full line voltage.

VFD Overview
VFDs adjust both the frequency and voltage of power that is supplied to the motor, allowing for ongoing speed control of motor performance across the load range.

 

Soft Starters / VFD Comparison Table

Feature Soft Starter VFD
Startup Current Limiting Reduces mechanical stress on motors and connected equipment
Speed Control Motor runs at line speed Continuous speed control (ideal for variable-load applications)
Energy Efficiency Optimized startup reduces unnecessary energy consumption It can save significant energy in centrifugal loads by reducing speed. (US DOE)
Cost & Complexity Lower cost, simpler installation, minimal harmonics. Higher cost, requires filtering/cooling, and more complex integration.
Maintenance Minimal — few active components once in bypass. More components = more potential maintenance.

 

When to Choose Each

  • Soft Starter: Ideal for motors that run at fixed speed, require frequent starts, or when you need to limit starting current but want a cost-effective, low-maintenance solution.
  • VFD: Best for applications where load or flow varies significantly and where process from speed control is required.

Industry Trends
Future-ready plants often use a hybrid approach, adding soft starters for large fixed-speed motors (to protect the grid and equipment).

Supporting Insight
The U.S. Department of Energy notes that VFDs can reduce energy consumption when used in variable-torque applications, while soft starters remain a cost-effective solution for motors that operate at constant speed after startup.

Conclusion 
Choosing the right motor control solution is about balancing cost, efficiency, and process needs. If you’re planning an upgrade or new installation, we can help analyze your startup profiles and process requirements to recommend the best combination of soft starters and drives.

Contact Us

For any questions and further information

    Solcon-IGEL is a developer and manufacturer of soft starters, heat control systems, and motor control and protection solutions for heavy industry.
Our power electronic technologies are engineered for reliable operation across a wide range of industrial motor applications worldwide.