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Technical Knowledge Centre · 02

Engineering Fundamentals

Understand the core electrical, mechanical and thermal principles that govern motor and motion-system behaviour.

Browse technical information

Explore the Information by Engineering Subject

Begin with the subject closest to the decision you need to make. Move over a card to see the practical engineering value, then continue to the detailed evidence below.

Engineering decision framework

Turn Fundamentals into a Defensible Motor Selection

Use each subject to define the operating requirement, expose design constraints and identify the evidence needed before a motor or drive is approved.

01

Torque, Speed and Power

Mechanical output is defined by torque and rotational speed together; nominal power alone does not describe the operating requirement.

Engineering checks
  • Power: P = Tω
  • Torque: T = 9550P/n for kW, rpm and N·m
  • Check continuous, accelerating and peak operating points
  • Include transmission and mechanical losses
Continue to 02
02

Efficiency and Losses

Real system efficiency depends on the motor, drive, transmission and operating point across the complete duty profile.

Engineering checks
  • Copper, iron, mechanical and switching losses
  • Part-load and full-load operation
  • Drive and gearbox contribution
  • Thermal consequences of losses
Continue to 03
03

Thermal Behaviour

Motor capability is limited by the temperatures of windings, magnets, bearings, electronics and surrounding structures.

Engineering checks
  • Ambient temperature and altitude
  • Cooling method and installation surface
  • Thermal resistance and time constants
  • Continuous versus intermittent operation
Continue to 04
04

Load, Inertia and Acceleration

Dynamic applications require sufficient torque to accelerate both the driven load and every rotating component.

Engineering checks
  • Load torque and reflected inertia
  • Acceleration and deceleration time
  • Friction, gravity and external forces
  • Braking and regenerative energy
Continue to 05
05

Electrical Supply

Supply voltage, current capability and drive topology affect achievable speed, torque, control and protection.

Engineering checks
  • AC or DC supply and tolerance
  • Starting and peak current
  • Drive voltage and current limits
  • Cable, connector and protection requirements
Continue to 06
06

Ratings and Tolerances

Published values apply only under stated conditions and include manufacturing, measurement and application tolerances.

Engineering checks
  • Rated point and test conditions
  • Permitted temperature rise
  • Tolerance of constants and performance
  • Derating and service limitations
Return to 01

Engineering note

Apply General Knowledge with Model-Specific Evidence

Calculations provide a starting point, but the selected motor and drive must be checked against the complete operating cycle, thermal environment and mechanical system.

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