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EMF equation of DC machines is a mathematical expression to calculate the EMF induced in a DC machine. As you know, the amount of EMF induced in a conductor depends on the number of turns of the coil and the rate of change of flux. Derivation of EMF equation of DC machines Consider a motor … Read more
EMF equation of transformers lets you calculate the RMS values of induced voltages in the primary and secondary windings of a transformer. An alternating voltage, when applied to the primary of a transformer, produces an alternating magnetic field which induces EMF in the secondary windings. The produced magnetic flux is alternating in nature and lags … Read more
An electric motor converts electrical energy to mechanical energy. In general, an electric motor consists of a stator, a rotor, winding, bearings, and casing. The motor rotates due to the force of attraction or repulsion between the stator or rotor fields. This article provides you an overview of the parts of a motor. Parts of … Read more
Most of the time, the motor nameplates do not contain the number of poles data on them. The number of poles in a motor can be calculated from its synchronous speed and its rated frequency. Here is a simple synchronous number of poles calculator. Number of poles calculator in a motor Synchronous speed Rated frequency … Read more
The “synchronous speed” is the speed of the rotating magnetic field in an electric motor. Here is a simple synchronous speed calculator. Always remember that the synchronous speed and rated speed are two different parameters. Motor synchronous speed calculator Number of poles Supply frequency hz Calculate Result Synchronous speed RPM How to use the synchronous … Read more
The full load torque of a motor is the maximum torque that the motor can deliver when it is fully loaded. Here is a simple motor torque calculator that can help you calculate the full load torque of a motor. Motor torque calculator Enter the motor rated power HPkW Enter the motor rated speed RPM … Read more
Motor FLC or full load current or full load amperes (FLA) of a motor is the maximum current the motor windings are designed to carry. Here is a simple motor FLC calculator that can help you calculate the motor full load current. Motor data input Motor Type Three PhaseSingle Phase Enter the motor rated voltage … Read more
Induction motors are robust and reliable and are used in all industries across the globe. Various methods are followed to start induction motors, out of which star-delta starters are the most commonly used ones to reduce the starting current. Star-delta starters are cheaper than soft-starters and are widely seen in small-scale industries. Typically, star-delta starters … Read more
Star-delta starters are widely used for starting three-phase induction motors. It can reduce current inrush to 1/3 of direct-on-line starting current. Here is an advanced Star-Delta starter design tool that will help you select the optimum current rating of contactors, fuses, and circuit breakers (MCB, MCCB) for a star-delta starter circuit. Online star-delta starter design … Read more
The direct-on-line starter is the cheapest motor starting method. In this method, full voltage is applied to the motor terminals. Here a comprehensive DOL starter selection tool, which can help you calculate the appropriate rating of the contactor, fuse, circuit breaker, and overload relay used in a DOL starter circuit. Motor data input Motor Type … Read more
