Click here for an example Induction Motor from RS. DC motors were the first type of motor widely used and the systems motors and drive initial costs tend to be typically less than AC systems for low power units, but with higher power the overall maintenance costs increase and would need to be taken into consideration. These are the more traditional type of motor and are typically used in cost-sensitive applications, where the control system is relatively simple, such as in consumer applications and more basic industrial equipment, these type of motors can be broken down as:.
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Brushless motors alleviate some of the issues associated with the more common brushed motors short life span for high use applications and are mechanically much simpler in design not having brushes. The motor controller uses Hall Effect sensors to detect the rotors position and using this the controller can accurately control the motor via current in the rotor coils to regulate the speed. These types of motors are generally used in speed and positional control with applications such as fans, pumps and compressors, where reliability and ruggedness are required.
Electricity 4: AC/DC Motors, Controls, and Maintenance / Edition 9
An example of brushless design are in Stepper Motors , which are primarily used in open-loop position control, with uses from printers through to industrial applications such as high speed pick and place equipment. Brushless motors are also availble with a feedback device which allows the control of the Speed, Torque and Position of the motor and the intelligent electronics control all three so if more torque is required to accelerate quicker to a certain speed then more current is delivered, these are know as Brushless Servo Motors.
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AC Motors AC motors are highly flexible in many features including speed control VSD - Variable Speed Drives and have a much larger installed base compared to DC motors, some of the key advantages are: Low power demand on start Controlled acceleration Adjustable operational speed Controlled starting current Adjustable torque limit Reduced power line disturbances The current trend for VSD is to add more features and programmable logic control PLC functionality, which are advantages for the experienced used, but require greater technical expertise during maintenance.
Click here for an example of an AC Motor from RS Types of AC motor include: Synchronous In this type of motor, the rotation of the rotor is synchronized with the frequency of the supply current and the speed remains constant under varying loads, so is ideal for driving equipment at a constant speed and are used in high precision positioning devices like robots, instrumentation, machines and process control Click here for an example Synchronous Motor from RS Induction Asynchronous This type of motor uses electromagnetic induction from the magnetic field of the stator winding to produce an electric current in the rotor and hence Torque.
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Throughout this edition, motors are described in detail enabling the reader to develop a working knowledge of the operations, advantages and disadvantages of each type. A wide variety of controls are also explained to aid understanding, while discussion of AC motors and associated controls helps to develop an appreciation of control schemes applied to various applications of the motors. This edition features new and improved photos and diagrams to better enable readers to tie theory and practice together into real-life situations.
Specific objectives precede the introduction of each topic, while summaries and quiz items enable readers to measure their progress at the end of each chapter.
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