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.
Classification of Electric Motors - Part Two ~ Electrical Knowhow
Brushed vs Brushless Small DC Motors - Rotalink
DC Motor Types - Brushed, Brushless and DC Servo Motor
Introduction of brushless motor, brush motor, servo motor, stepper motor, reduce - Technical Knowledge - Integrated servo motor Integrated Closed loop stepper motor
Brushless motor vs brushed motor: The features of the Orbray brushless motor. - Orbray MAGAZINE - Orbray Co., Ltd.
Brushed DC Motors and Brushless Motors, Toshiba Electronic Devices & Storage Corporation
DC Motor: What Is It? How Does It Work? Types, Uses
Brush DC Motors Wide Selection from Anaheim Automation
Brushed Servo Motors - DC Brushed Servo Motors
DC Motors - DirectPower™ Brand Permanent Servo DC Motors
DC Motors and Stepper Motors used as Actuators