Welcome to this classroom installment on dc motors. DC motors are motion components that take electrical power in the form of direct current (or some manipulated form of direct current) and convert it into mechanical rotation. The motors do this through the use of magnetic fields arising from electric currents through their windings to spur the rotation of a rotor fixed with an output shaft.
This classroom details the specifics of such operation in dc brush motors, also called permanent-magnet (PM) dc motors 鈥� as well as the use of these motor types in various in motion designs. We also cover brushless dc (BLDC) motors. These employ magnets instead of brush-commutator assemblies for commutation to operate much like shunt-wound motors, but with field flux from magnets instead of winding current.
Comparing the different types of dc motors
Where brush dc motors make sense
Minimizing brush wear
Brush dc motors are a mature technology that鈥檚 been around for more than a century.
Brushed dc motors provide high speed and torque, are simple to operate, and are generally inexpensive.
There are three dc motor subtypes: DC brush motors, dc permanent-magnet (PM) motors, and dc universal motors.
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maxon DC motors are high-quality DC motors, equipped with powerful permanent magnets.
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Explanation of sinusoidal commutation
Brushless dc motor basics
Avoiding torque ripple
Although the back EMF waveform of a brushless dc (BLDC) motor is theoretically trapezoidal, in reality, inductance in the motor smooths the back EMF into a more sinusoidal shape.
Torque ripple鈥攙ariations in torque production during shaft revolution鈥攊s an undesirable effect that occurs in permanent magnet motors, preventing smooth motor rotation.
Brushless dc (BLDC) motors are dc motors that use magnets instead of brushes and a commutator for commutation.
Differences between slotted and slotless motors
Difference between EC motors and BLDC motors
External-rotor motor basics
Conventional brushless dc motors are constructed with a permanent magnet rotor located inside a wound stator.
Deciphering motor terminology can be frustrating, especially when comparing the operation and performance of various motor types.
The original brushless dc (BLDC) motors were designed with slotted stators, and the majority of BLDC motors are still made this way.
FAQ: What鈥檚 the difference between torque constant, back EMF constant, and motor constant?
What鈥檚 the difference
between cogging torque
and torque ripple?
FAQ: What are rotational losses in dc motors?