TND6041 DC Motor Driver Fundamentals（TND6041直流电机驱动基本面）.PDF

TND6041/D DC Motor Driver Fundamentals TECHNICAL NOTE INTRODUCTION Electric motors have been with us since the early 19th commutator is a set of contacts attached to the armature shaft century, when Hungarian physicist Ányos Jedlik produced that keeps reversing the direction of current flow in the the first continuously rotating DC motor, made possible by armature as it turns, thus ensuring that the motor continues his invention of the commutator. By the early 20th century to turn. electric motors revolutionized industry and agriculture and While motors are mechanically rather simple, the terms made possible such labor saving consumer applications as that describe them can be confusing. In mechanical terms washing machines and refrigerators. Today electric motors the rotating part of motor is called the rotor; the stationary power everything from giant cruise ships to implantable part is the stator. In electrical terms the power producing medical devices. part of the motor is called the armature; depending on the There are many different types of motors, but they all design the armature can be either the rotor or the stator. The contain three basic elements: an armature, a field magnet, field is a magnetic field component of the motor; again this and a commutator. The armature is a conductive coil that in can be either the rotor or the stator and it can be either an most cases is attached to a rotating shaft and surrounded by electromagnet or a permanent magnet. In general