VFD Scheme – Modern electric motor drives

VFD Scheme – Modern electric motor drives Draws and writes: Radoje Janković. In this group of schemes, I will present mostly practical schemes of modern electric motor drives. In school and university literature, as well as other electrical engineering literature, one can find few modern practical schemes for connecting three-phase electric motors in relation to […]

Multi-winding variable frequency drive transformers

Author: Radoje Jankovic Multi-winding variable frequency drive transformers Multi-winding  variable frequency drive (VFD) transformer suppzing variable frequency drives. These variable frequency drive transformers are often classified in the category of „special transformers“.  The Figure 1 shows a single-line schematic-graphic symbol of an 18-pulse converter transformer. The transformer is four-winding; one primary and three secondary windings. Phase sequence labels […]

VFD tansforrmers some practical details and explanations

  Author and drawer Radoje Jankovic Note: If you want to be a electrical expert, you must to draw high quality any kind of electrical circuit diagrams and respecting IEC standards!   VFD tansforrmers some practical details and explanations Classical winding connections are: a) Star or wye, denoted as „Y“ or “y”.  The windings are connected […]

Frequency Regulated Drives – Practical Schemes, Diode Supply Units (DSU)

Drawing and text by author Radoje Jankovic Frequency Regulated Drives – Practical Schemes,  Diode Supply Units (DSU) Here are presented the practical schemes with diode-thyristors supply units (DSU) and some applications from practice. A. How the Diode Supply Unit works 1. Typical main circuit diagram of Diode Supply Unit (DSU), half-controlled diode-thyristor rectifier Figure 1. […]