Servo Applications and Automotive Applications of Electric Machines

This course is offered in German.

Learning objective:

The module deepens the basic knowledge of synchronous, induction and DC machines with specific insights into the special design of permanently excited machines and the special features of operation as a servomotor or as a vehicle drive. The students learn to

• independently analyze the operating behavior of PM DC motors and BLDC motors and special features such as torque pulsations of BLDC motors,
• assess which types of electric machines are particularly suitable or less suitable as servo motors or vehicle motors,
• design the magnetic circuits of PM excited machines to meet requirements and to protect them against demagnetization during operation,
• analyze important system aspects (detection of the rotor position, generation and avoidance of bearing currents or overvoltages).

Contents:

• Introduction (magnetic materials, finite element method for calculating PM excited machines)
• PM excited DC motor (structure and mode of operation, applications and designs, calculation of the stationary and dynamic operating behavior, demagnetization resistance of PM, variation of torque-speed characteristics, electronic rectifiers for DC machines)
• Electronically commutated motors (BLDC motors) (structure and mode of operation, torque formation and motor design with block-shaped current, motor characteristics, designs of PM-excited motors with slotted stator core and with air gap winding, special features of single-phase BLDC motors)
• PM excited synchronous machines
• Basics of servo technology (servo drive systems with DC motors, synchronous motors and induction motors)
• Vehicle drive systems (generators for conventional vehicles, requirements for electric traction motors, suitability of various types of electric machines as traction motors, auxiliary motors in vehicles)
• Important system aspects (sensor principles for detecting the rotor position, shaft voltages and bearing currents, overstressing of the insulation system due to transient overvoltages)