Medium Voltage AC Motor Drives

For over 125 years, Ward Leonard has provided power solutions to the world’s most demanding Heavy Industry customers.

Today, we provide a comprehensive line of medium voltage variable frequency AC drives that are cost effective, reliable and built specifically for critical applications that demand configuration flexibility.

All drives feature a compartmentalized design that provides voltage class segregation, top or bottom feeds, and a copper wound integral transformer that provides consistent operation and simplified installation. Additionally, all are equipped with Power Bridge technology and drive tool software and keypad for enhanced productivity and efficiency.

Market Utilization Includes:

  • Land-based drilling
  • Offshore drilling
  • Hydraulic fracturing
  • Petrochemical
  • Process
  • Chemical
  • Marine
  • Mining & material handling
  • Pulp & paper
ac motor drives brochure


Ward Leonard AC Motor Drives – MV Series

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Flexible Configurations To Suit Your Needs

Durable. Interoperable. Compact Design.

  • Delivers a Mean Time Between Failure (MTBF) exceeding 16 years
  • Compact design streamlines installation, commissioning & maintenance
  • Perfect fit for modernization / retrofit applications
  • Easy-to-use software interface with remote log-in screens
  • Multiple configurations for the most space efficient input / output orientation
  • Durable “trailerized” portability
  • Interoperability with any medium voltage motor
  • Seamless integration with pump or compressor station control systems

Engineered For Power, Simplicity & Efficiency

Medium Voltage IGBTs

  • Each inverter utilizes medium voltage Insulated Gate Bipolar Transistors (IGBTs)
  • High-power IGBTs allow a simpler, more reliable inverter design with fewer power switches

24-Pulse Converter

  • Each phase leg of the converter includes a 24-pulse diode rectifier
  • This design exceeds the IEEE 519-1992 specification for Total Harmonic Distortion (THD) without requiring filters

Liquid/Vapor Heat Exchange Cooling Technology

  • Technology is used in each of the three inverter phase legs (Most Ratings)
  • Reduces ambient noise and saves valuable floor space in your operation

Windows®-Based Configuration & Maintenance Tools

  • World-class tools improve productivity in commissioning and typical maintenance activities

Productivity Suite

Drive Tool Software

  1. Trend Window
  2. Extensive Search
  3. Live Block Diagrams

Drive Keypad

  1. High Function Display
  2. RJ-45 Ethernet Port
  3. Instrumentation Interface
  4. Interlock Button
  5. Switch to Local Mode
  6. Easy-to-understand navigation buttons

Packaged Solutions & Support

Ward Leonard has extensive experience designing and developing integrated systems that solve problems associated with our customers’ complex and severe environment applications. As a dedicated partner, we provide:

  • Packaged motor & drive solutions from 2000-6000HP
  • Pre-configured medium-voltage AC motor drives for any Ward Leonard, or other medium-voltage motor
  • Customized geometric drive configurations to suit your needs
  • Pre-tuned, ready-to-use drives — or enable you to tune yourself
  • Convenience & security of utilizing one company for both drives and motors — reducing costs & potential interoperability challenges