Brushless DC Motors (BLDC): What Are They & How Do They Work?

What is a Brushless Motor? A brushless DC motor (also known as a BLDC motor or BL motor) is an electronically commuted DC motor which does not have brushes. The controller provides pulses of current to the motor windings which control the speed and torque of the synchronous motor. These types of motors are highly … Read more

Squirrel Cage Induction Motor: Working Principle & Applications

A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. It is called a ‘squirrel cage’ motor because the rotor inside of it – known as a ‘squirrel cage rotor’ – looks like a squirrel cage. This rotor is a cylinder of … Read more

Synchronous Motors: Applications, Starting Methods & Working Principle

Electrical motors are an electro-mechanical device that converts electrical energy to mechanical energy. Based on the type of input we have classified it into single phase and 3 phase motors. The most common type of 3 phase motors are synchronous motors and induction motors. When three-phase electric conductors are placed in certain geometrical positions (i.e. … Read more

DC Motor or Direct Current Motor

What is DC Motor ? The electric motor operated by dc is called dc motor. This is a device that converts DC electrical energy into a mechanical energy. Principle of DC Motor When a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move. In other … Read more

Losses in DC Machine

As we know “Energy neither can be created nor it can be destroyed, it can only be transferred from one form to another”. In DC machine, mechanical energy is converted into the electrical energy. During this process, the total input power is not transformed into output power. Some part of input power gets wasted in … Read more

Working or Operating Principle of DC Motor

The DC motor is of vital importance for the industry today and is equally important for engineers to look into the working principle of DC motor in details that we have discussed in this article. To understand the operating principle of DC motor we need to first look into its single loop constructional feature. The … Read more

Construction of DC Motor (Parts & Images)

A DC motor is a device that converts direct current electrical energy to mechanical energy (learn about a DC motor’s working principle). A DC motor is constructed with: A Stator A Rotor A Yoke Poles Field windings Armature windings Commutator Brushes A stator is the static part of the DC machine that houses the field … Read more

Torque Equation of DC Motor

When a DC machine is loaded either as a motor or as a generator, the rotor conductors carry current. These conductors lie in the magnetic field of the air gap. Thus each conductor experiences a force. The conductors lie near the surface of the rotor at a common radius from its center. Hence torque is … Read more

Low Power Factor Operation of Induction Motor

Induction Motors finds various applications in industries and household equipments. Such machine requires magnetic fields for its functioning hence, it draws magnetizing current from the source. The magnetizing current is the current that establishes the flux in the air gap of an Induction motor and this is independent of the load on the motor. It … Read more

Direct Online Starter or DOL Starter

The most basic, inexpensive and straightforward method of starting a 3 phase squirrel cage induction motor is the DOL starter. Direct online starter (DOL) connects 3-phase motors directly across 3-phase supply, and the beauty of this type of starter is in spite of motor connected straight, it doesn’t cause any harm to the motor. Mainly … Read more