DC motor types
A clear comparison of permanent-magnet, shunt, separately excited and series-wound motors.
Read articleTechnical knowledge
Guide to electric motors and drive technology
Fundamentals and decision support for engineering, maintenance and procurement.
Selecting and sizing an electric motor combines technical terminology with commercial decisions. These articles provide practical answers as a starting point for a technical discussion with us.
Duty types S1, S2 and S3
How continuous, short-time and intermittent duty affect thermal motor sizing.
Read articleRepair or replace?
The technical and commercial criteria that matter when assessing an existing motor.
Read articleData for motor sizing
Which load, speed and duty-type data are needed for a reliable motor sizing.
Read articleRebuilding a discontinued motor
How a no-longer-available DC motor can be rebuilt from its nameplate and the original part.
Read articleBrushed or brushless motor?
Design, efficiency, maintenance and typical applications of brushed and brushless motors compared.
Read articleGlossary: key terms
The key terms around DC motors, duty types and motor sizing explained briefly.
Read articleMaintenance and carbon brushes
Function of carbon brushes, wear signs and maintenance recommendations for brushed motors.
Read articleSpeed control (PWM)
Basic principle, PWM drive and H-bridge for DC motor speed control.
Read articlePermanent magnets: neodymium vs. samarium-cobalt
Alloys, shapes, dimensions and magnetic data of NdFeB and SmCo magnets compared.
Read articleTachometer, encoder, resolver, Hall sensor
Design, operation, pros and cons, and signal interfacing of common speed and position feedback systems compared.
Read articleBrakes for electric motors
Spring-applied brakes, electronic braking methods and other brake types: design, operation, purpose, pros and cons at a glance.
Read article