Yaskawa Whitepaper: The I’s and O’s of VFDs
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Facts Worth Knowing About AC Drives – Electric Motors Sections 2.4 – 2.4.8
The synchronous motor is defined by the fact that the rotor rotates at the same speed as the magnetic field created by the stator windings. The design of the stator is in many cases similar to that of induction motors, with distributed windings. Some manufacturers use concentric windings (in slot) which enable a more compact motor design and require less copper. The energy savings achieved by the reduced use of copper are however often eaten up by additional losses, which result from harmonics in the air gap flux caused by the construction.
Facts Worth Knowing about AC Drives – Star and Delta Configuration in Field Weakening Operation Sections 4.5 – 4.8
Machines can create potential or kinetic energy which we want to remove from the machine. The dynamic characteristics of some loads require 4-quadrant operation. A reduction in the stator frequency (and voltage) by the AC drive allows the motor to act as a generator and convert mechanical energy into electrical energy. Motors connected directly to the mains deliver the braking energy straight back to the mains.
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Weidmüller’s u-control 2000: The Automation Controller
Weidmüller’s scalable engineering software, u-control 2000, adapts individually to your requirements. And, the u-control is powerful, compact and fully compatible with Weidmüller’s I/O system u-remote. This article looks at what makes u-control the heart of your automation.
Programmable logic controllers (PLCs) are one of the main components of any automated system. A typical control system has inputs, outputs, controllers (i.e., PLCs), and some type of human interaction with the system, a human machine interface (HMI), for example.
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