Starting Methods of Induction Motors Our everyday domestic experience is likely to lead us to believe that there is nothing more to starting a motor than closing a switch, and indeed for most low-power machines (say up to a few kW ) – of whatever type – that is indeed the case. By simply connecting […]
Process of Motor Selection The process of motor selection often highlights difficulties in three areas. Firstly, there is a good deal of overlap between the major types of motor and drive. This makes it impossible to lay down a set of hard and fast rules to guide the user straight to the best solution for
Most commercial servo drives accept PWM and direction signals as input. Also, many servo drives produce a PWM output voltage signal to the load such as a motor coil instead of a linearly variable output voltage. A PWM signal is a square-wave signal of fixed amplitude and frequency, but the width of the on and
A very common application of transistors is to construct drivers to drive motors. One such circuit is the H-bridge driver circuit, which is commonly used to drive motors in both directions. The circuit looks like the letter ‘H’ in circuit schematics, so it is called an H-bridge. An H-bridge circuit is constructed using four switching
Variable Frequency Drive Working A variable frequency drive (VFDs) uses solid state electronic circuits to provide a signal to a motor to control its acceleration, deceleration, direction of rotation, torque, and horsepower. Drives do this by converting a fixed frequency (either 50 or 60 Hz) AC power source, to a variable frequency power supply to
Overheating is a major cause of insulation and bearing failure. 3 phase motor overheating reasons are as under: Line-Caused Motor Overheating Reasons There are four causes of line-caused overheating: overvoltage, low voltage, unbalanced voltage, and a high-resistance connection. Overvoltage: Overvoltage can cause a normally loaded motor to overheat. NEMA standard specifications allow motors a voltage
Hi friends, In this article, I am providing you some basic information about Brushless DC motor i.e. BLDC motor. With the help of this information you can easily understand the BLDC motor working principle and operation. The torque-speed characteristics and the flexibility of the dc motor have made it a very attractive choice for applications
Hi friends, in this article, I am going to describe the linear induction motor working principle. This article will provide you answers of various questions about the LIM. A linear induction motor is a developed version of cylindrical induction motor. It is special type of induction motor which gives linear motion instead of rotational motion
The induction motor is equivalent to a rotating transformer. Hence, we can draw the induction motor equivalent circuit with the help of equivalent circuit of the transformer. The basic equivalent circuit of induction motor is shown in Fig. which is very similar to that of a transformer. Here R1 and X1 are the per phase
Hi friends, in this article, I am talking about thermal overload relay working principle and its function in a DOL starter. I hope you will find this article informative and helpful. A thermal overload relay works on the heat produced by the excessive overload current. The heat produced by the overload current is utilized to trip