Inverter (VFD) Selection Guide｜Choose the Right Model for Different Load Types

Choosing the right inverter (VFD) for your load type improves energy efficiency, equipment life, and safety in industrial motor control.
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1. Role of an Inverter in Motor Control
An inverter controls the frequency (Hz) and voltage (V) to adjust motor speed and torque.
Key benefits:
- Precise speed control
- Energy savings at low load
- Soft start to prevent inrush current
- Longer motor & machine lifespan
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2. Load Types and Characteristics
(1.) Constant Torque Load – conveyors, compressors, elevators
(2.) Variable Torque Load – fans, pumps, blowers
(3.) High Starting Torque Load – crushers, mixers
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3. Key Selection Factors
- Motor power rating (choose 10–20% higher than motor)
- Load type & torque needs
- Voltage compatibility (220V/380V/415V)
- Functions (PID, communication, protection)
- Environmental protection (IP rating)
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4. Recommended Settings & Protection
- Accel/Decel time adjustment
- Current limit
- Over/Undervoltage protection
- Auto restart
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5. Why Choose Hitachi Inverters (Hitachi Asia Thailand)
- Supports constant & variable torque loads
- High efficiency with advanced control
- PLC/SCADA ready
- Rugged industrial design
- Local Thai technical support
📄 For more information, download the product PDF or contact our technical team.
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