Practical Variable Speed Drives and Power Electronics by Malcolm Barnes

By Malcolm Barnes

Normal functional purposes of VSDs in approach regulate and fabrics dealing with, similar to these for pumping, air flow, conveyers, compressors and hoists are lined intimately.

· presents a basic knowing of the install, operation and troubleshooting of Variable velocity Drives (VSDs)

· contains useful assurance of key subject matters reminiscent of troubleshooting, keep an eye on wiring, working modes, braking kinds, automated restart, harmonics, electrostatic discharge and EMC/EMI issues

· crucial interpreting for electric engineers and people utilizing VSDs for functions similar to pumping, air flow, conveyors and hoists in technique regulate, fabrics dealing with and different business contexts

Show description

Read Online or Download Practical Variable Speed Drives and Power Electronics (Practical Professional Books) PDF

Best electronics books

Dielectric Materials and Devices

This exact stand by myself quantity info new advancements in dielectric ceramics. It offers finished reports of latest fabrics and product ideas and contains issues equivalent to fabrics synthesis and processing, relaxors & novel compositions, dielectric loss mechanisms, multiplayer ceramic units, and value research of tomorrow’s electrical units.

Analog/RF and Mixed-Signal Circuit Systematic Design

Even though within the electronic area, designers can take complete advantages of IPs and layout automation instruments to synthesize and layout very complicated platforms, the analog designers’ activity remains to be regarded as a ‘handcraft’, bulky and intensely time eating approach. hence, super efforts are being deployed to advance new layout methodologies within the analog/RF and mixed-signal domain names.

Solder Paste in Electronics Packaging: Technology and Applications in Surface Mount, Hybrid Circuits, and Component Assembly

One of many most powerful developments within the layout and manufacture of contemporary electronics applications and assemblies is the usage of floor mount know-how as a substitute for through-hole tech­ nology. The mounting of digital units and elements onto the skin of a published wiring board or different substrate deals many benefits over putting the leads of units or elements into holes.

Additional info for Practical Variable Speed Drives and Power Electronics (Practical Professional Books)

Example text

The basic design of a squirrel cage induction motor (SCIM) and a wound rotor induction motor (WRIM) are very similar, the main difference being the design and construction of the rotor. The design and performance of AC induction motors is described in considerable detail in Chapter 2: 3-Phase AC induction motors. In AC induction motors, the slip between the synchronous rotating stator field and the rotor is mainly dependent on the following two factors, either of which can be used to control the motor speed: • Stator voltage: Affects both the flux and the rotor current.

The field coil time constant is the most significant factor and there is very little that can be done to improve it, except possibly to use a larger coupling. Closed loop speed control with tachometer feedback can also be used to improve its performance. But there are many applications where the dynamic response or output speed accuracy are not important issues and the eddy current coupling has been proven to be a cost effective and reliable solution for these applications.  +RKIZXOIGR \GXOGHRK YVKKJ JXO\K SKZNUJY In contrast to the mechanical and hydraulic variable speed control methods, electrical variable speed drives are those in which the speed of the electric motor itself, rather than an intermediary device, is controlled.

Consequently, the rotor settles at a speed slightly less than the rotating flux, which provides enough torque to overcome bearing friction and windage. The actual speed of the rotor is called the slip speed and the difference in speed is called the slip. Consequently, induction motors are often referred to as asynchronous motors because the rotor speed is not quite in synchronism with the rotating stator flux. The amount of slip is determined by the load torque, which is the torque required to turn the rotor shaft.

Download PDF sample

Rated 4.82 of 5 – based on 25 votes