Here is DC Motor working principle; types of DC Motor - Brushed, Brushless, DC Servo Motor; DC Motor driving using H bridge and L293D motor drivers, etc.
DC Motor Types - Brushed, Brushless and DC Servo Motor
Brushless Vs Brushed DC Motors: When and Why to Choose One Over the Other, Article
Which types of DC motors can be used as servo motors?
Types of Electric Motors and Their Applications
Brushless DC Motors (BLDC Motors) vs. Servo Motors vs. Inverters
Servo Drives for Brushed DC Motors - INGENIA
Brushless DC electric motor - Wikipedia
Brushless DC Motors BLDC Motors from NANOTEC
DC Motors and Stepper Motors used as Actuators
Brushed DC Motor Working Principle
What are Brushless DC Motors
Three Phase Brushless Servo Motors - ADVANCED Motion Controls
What is brushless motor?
DC Motor: What Is It? How Does It Work? Types, Uses
Brushless vs Brushed DC Motor, What`s Difference?