DC Motor

Operation of Servo Motor

This article focuses on a motor intended for motion control—the servomotor, or servo. Whereas stepper motors rotate through an angle and halt, many servo motors rotate continuously. Properly controlled, a servo can do everything a stepper can and more. In addition to setting the rotation angle, the controller can configure the servo’s rotational speed and …

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Operation of Thyristor DC Drives

Operation of Thyristor DC Drives The thyristor d.c. drive remains an important speed-controlled industrial drive, especially where the higher maintenance cost associated with the d.c. motor brushes is tolerable. The controlled (thyristor) rectifier provides a low-impedance adjustable ‘d.c.’ voltage for the motor armature, thereby providing speed control. Until the 1960s, the only really satisfactory way …

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Characteristics of DC Motor

Characteristics of DC Motor Before variable-voltage supplies became readily available, most d.c. motors were obliged to operate from a single d.c. supply, usually of constant voltage. The armature and Weld circuits were therefore designed either for connection in parallel (shunt), or in series. As we will see shortly, the operating characteristics of shunt and series …

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