For rotary AC motors, asynchronous (induction) motors are more common than synchronous motors. But when it comes to linear motion, linear synchronous motors, abbreviated LSMs, are more common. The vast majority of LSMs I’ve seen have permanent magnets, so this article focuses exclusively on permanent magnet LSMs. Structure of Linear Synchronous Motors In general, linear […]
Operation of Synchronous Motor Drives As soon as variable-frequency inverters became a practicable proposition it was natural to use them to supply synchronous motors, thereby freeing the latter from the fixed-speed constraint imposed by mains-frequency operation and opening up the possibility of a simple open-loop controlled speed drive. The obvious advantage over the inverter-fed induction
Synchronous motors provide a precise, specific and constant speed for a wide range of loads, and are therefore used in preference to induction motors when constant speed operation is essential. Such machines are available over a very wide range from tiny single-phase versions in domestic timers to multi-megawatt machines in large industrial applications such as
The procedure of connecting an alternator in parallel with another or with common bus bars is called synchronization of alternator. Conditions for Synchronization of Alternators For proper synchronization of alternator, the following conditions must be fulfilled: All these conditions must be full filled to ensure that there will be no circulating current between the windings
Synchronous motors have their pole-shoes slotted for placing copper bars. The copper bars are placed in these slots and short-circuited at both ends by heavy copper rings (like squirrel cage rotor of induction motors). This arrangement is known as damper winding in synchronous motor. Role of Damper Winding in Synchronous Motor The damper winding in
Hi friends, In this article, I am going to describe the advantages and application of synchronous motor. Some characteristic features of this machine are as follows: 1. It runs at a constant speed (synchronous speed). The only way to change its speed is to vary the supply frequency. 2. It is not inherently self-starting. 3.
Hi friends, In this article, I am going to explain the effect of excitation on the synchronous motor, V – curves and over excited synchronous motor. This article will help you to understand the behavior of these motors. When the rotor of the synchronous motor rotates an EMF is induced in its stator winding due
Since a synchronous motor is inherently not self-starting, the following synchronous motor starting methods are adopted generally: Synchronous Motor Starting Methods Pony Motor Starting Method: In this method, a small induction motor known as pony motor is used to bring the motor speed to synchronous speed. After the speed has reached up to its synchronous
Hi friends, In this article, I am going to discuss the synchronous motor working principle. I hope you will find it interesting and helpful. Synchronous motor construction is very similar to that of a synchronous generator. Essential parts of the synchronous motor are the same as those of the synchronous generator i.e., a stator and
Hi friends, In this article, I am describing the construction of synchronous generator and hoping this article will boost your knowledge and imaginations. AC generators always run at a constant speed (synchronous speed). That is why they are also known as synchronous generators. Practically in all medium and large synchronous generators, the armature is housed