By W. Drury
This is often the 1st commercially released version of this bestselling publication via the keep an eye on options corporation, a number one producer of drives and regulate devices to the electronics and production industries. The revised guide has been commonly accelerated and is well-written and illustrated. it's a very entire advisor to the expertise underlying drives, vehicles and regulate devices and includes a wealth of technical details for the practising drives and electric engineer. although, its useful strategy will make it priceless as a reference paintings at the shelf of each engineering division and library.
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Extra resources for Control Techniques Drives and Controls Handbook
The effect is termed armature reaction. e. at 90 ° to the flux path and midway between the field poles, assuming no flux path distortion. 8c shows that distortion of the flux owing to armature reaction causes the neutral axis to shift. 8c, the brushes would again lie on the neutral axis, that is at 90 ° to the direction of the main flux path. Compensation To improve commutation, interpoles are introduced to shift the main flux so that it lies on the geometric neutral axis. These interpoles are interposed between the main field poles and their coils carry the full armature current, generating a flux proportional to current (torque load) and reducing the effect of armature reaction.
In this case, however, interpoles and winding compensation are not available options. Square-frame motors offer reduced centre height compared with round-flame motors by virtue of the fact that the main field poles mounted on the four flat internal faces are of pancake design and that the four interpoles, mounted on diagonal axes, fit into the internal corners of the square. The prime purpose of the commutator is to switch the current to each set of windings in turn on the armature, and if the optimum relationship between the stator flux and the armature flux is to be maintained for the best current conversion to torque, higher rates of commutation are essential to ensure minimum torque ripple in the motor.
C~ 0 > 0 0 E ideal / 100 % ical Reduced Frequency The consequence of reducing the supply frequency can readily be deduced from the relationship described above. f, in the stator winding will be proportional to frequency, hence the voltage supplied to the machine windings must be correspondingly reduced in order to avoid heavy saturation of the core. This is valid for changes in frequency over a wide range. The voltagefrequency relationship should therefore be linear if a constant flux is to be maintained within the machine, as the designer intended.