1. Understand the main structure of DC motors, pay attention to the role of commutators and brushes; 2. Be familiar with the basic working principles of DC generators and DC motors, understand the physical meaning of the two electromechanical energy conversion elements of induced electromotive force and electromagnetic torque, and master the calculation methods for solving them; 3. Master the operating principle of DC motors, the balance equations of electromotive force and torque, and the working characteristics of DC motors with different excitation methods; 4. Understand the commutation of DC motors. The basic balance equations and working characteristics of DC motors. It is a device that converts mechanical energy into DC electrical energy or converts DC electrical energy into mechanical energy. DC motors that convert mechanical energy into electrical energy are called DC generators, and DC motors that convert electrical energy into mechanical energy are called DC motors.
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