Charles LeMone
LeMone Technical Services
Roanoke, VA 

Is the induction motor the preferred answer in industrial drive applications? What is happening to the synchronous, DC and wound rotor motor (WRM) in those applications? This paper discusses:

• Observations as customers replace synchronous, WRM and DC machines with the induction motor
• Why synchronous motors are used in industrial applications
• Issues with WRM and soft starters
• A case study of a 12,000 hp 4-pole synchronous motor and a soft starter
• What needs to be done to modernize the older synchronous motor starter?
• How a brushless synchronous motor operates
• Brushless synchronous motor protection

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