By W. Drury
This is often the 1st commercially released variation of this bestselling publication through the regulate ideas corporation, a number one producer of drives and keep an eye on devices to the electronics and production industries. The revised guide has been widely extended and is well-written and illustrated. it's a very complete advisor to the know-how underlying drives, automobiles and keep an eye on devices and incorporates a wealth of technical info for the practising drives and electric engineer. even if, its useful method will make it important as a reference paintings at the shelf of each engineering division and library.
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Extra info for Control Techniques Drives and Controls Handbook
Servomotors. C. servomotors. C. servomotors because brushless servomotors of synchronous type with a permanent magnet rotor detect the position of the rotational magnetic field to control the three-phase current of the armature. C. refers to a motor with a sinusoidal stator winding distribution which is designed for use on a sinusoidal or PWM inverter supply voltage. C. refers to a motor with a trapezoidal stator winding distribution, which is designed for use on a squarewave or block commutation inverter supply voltage.
Under normal circumstances, and with a correctly-determined servo system, demagnetisation of the motor is not possible. However, if the system is not correctly 2 Currently, magnets made from rare-earth materials are expensive and their use can double the cost of a motor, but for many applications the choice of such magnetic materials is unarguably justified; the resulting magnetic flux is much denser per unit volume of magnet, and therefore the rotor inertia can be significantly reduced for a given rated output torque.
PM motors use a low-cost ferrite magnetic material which, although more than adequate for the majority of applications, does have some inherent disadvantages. Mechanically, ferrite magnets are fragile, and so are usually bonded to the motor body, which is very secure. However, because ferrite magnets are also brittle, they are susceptible to mechanical shock and can be fractured unless the motor is handled with great care. One of the more important disadvantages of low-cost magnets, however, is the ease with which they can become demagnetised.