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AC Motors

AC series motor or the universal motor is an electric motor that operates in either Ac or Dc power at the same speed and output. Also, Ac series motor is a modified Dc series motor. What does this mean; it means that we modify the DC series motor to be able to work in AC single-phase supply. This modification includes the following as: We laminate the entire magnetic circuit of the DC series motor so the eddy current loss reduces. But this means the construction of the Ac motor will be more expensive. We use a few turns series field...
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Structural Differences Between DC And AC Generators

The main difference between a DC generator and an AC generator is that a DC generator will produce “Direct Current", and an AC generator “Alternating Current". That’s the basic highschool answer for a homework assignment, but there’s much more behind it, and that response is not even precise. I mean, you can just lightly modify the commutator in a DC generator and prove that a DC generator is a source of AC voltage … So, what’s the big deal? Let’s get into context first. Both AC and DC generators transform mechanical energy into electricity, depending on their work on Faraday’s...
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The Commutator And It’s Function in a DC Motor

The function of a commutator in DC generator The function of a commutator? Yes, why wonder? When we talk about the construction of the DC generators we speak in detail about the commutator, so what is new? that’s very good and you are perfectly right. We speak about the commutator because we consider it as the rotor. It’s the most important in DC generator because: It connects between the rotating armature conductors and stationary external circuits by the brushes. It converts the alternating current produced in armature conductors to a unidirectional current in the external load circuit. Sequentially it also...
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Torque Slip Characteristics

Torque slip characteristics of induction motor are also known as torque-speed characteristics. They provide us with information about the variation of torque with the slip. And the variation of the slip obtained with the variation of speed. When the speed varies, the slip varies and in contrast, the torque will also vary. To understand the torque slip characteristics of induction motor we should focus on the mathematics relations. And from this relation, we deduce that curve. This curve provides us with information about the operation of an induction motor. At the synchronous speed slip (S)=0. So, the motor will produce...
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DC Shunt Motor

Shunt-wound DC motor or DC shunt motor is a self-excited DC motor that operates on direct current and the field winding is connected in parallel to the armature winding. So both windings are exposed to the same power supply voltage, and this motor is able to maintain a constant speed with any load. Shunt motor is the most common type of DC motor where we connect the field winding parallel with the armature windings. So, this motor can be self-excited from the armature windings and this gives it the feature of greatest speed regulation, simplified reversing control, and low starting...
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Series Wound DC Motor

Series wound DC motor is a self-excited Dc motor that converts electrical power into mechanical power based on electromechanical law. But in this motor, the field winding is connected in series to the armature winding. In this motor we have a large amount of starting torque so it’s the best with (applications of DC series motor): Small electrical appliances. Traction applications. Crane applications. Elevators. Winching systems. And versatile electric equipment. And also the advantages of the series motor are: High starting torque for a given power rating. Simple construction. Easy to design. Easy maintenance. It works with both alternating or...
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DC Compound Motor

DC compound motor or Compound wound DC motor is also a self-excited motor, but it is a compound of both series and shunt field coils connected to the armature winding. The series field winding is connected in series with the armature and a shunt field winding is connected in parallel to the armature. Briefly, we can say that DC compound motor is a combination of both a shunt-wound DC motor and a series-wound DC motor. This means that the compound motor has the advantage of high starting torque and efficient speed regulation. Thus, it can be used in industrial applications...
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Permanent Magnet DC Motor [PMDC Motor]

Permanent magnet DC motor or PMDC motor is a separately excited motor. This motor is different from all other types of motors. From the name permanent magnet, we use a permanent magnet to create the required magnetic field. And I should tell you that PMDC motor generally operates on 6V,12V, or 24V Dc supply obtained from batteries or rectifiers. Applications of Permanent Magnet DC motor This motor is very simple in construction. But unfortunately, field control of this motor isn’t possible so we use only small DC motors. It applies to stuff as follows; Windshield wipers. Washer.  Automobiles as a...
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Brushless DC Motor

Brushless DC motor or BLDC motor is a special type of motors as it doesn’t contain brushes. Also, it has high efficiency typically around 85-90% in producing large amounts of torque over a vast speed range. Brushless DC motor is also known as electronically commutated motor or synchronous DC motor powered by DC electricity and produces AC electric current. In brushless motor; the permanent magnets rotate around a fixed armature which helps to overcome the problem of connecting current to the armature. Construction of brushless Dc motor We can say that the brushless motor has the same construction of the...
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Single Phase Induction Motor

Working Principle of Single-Phase Induction Motor In this article, we will explain the Working principle of single-phase induction motor and construction of single-phase induction motor.  When you look around you in your home, office, factory, workshop, business establishment, and everywhere, what do you find? Undoubtedly there is a single-phase motor in: Air conditioner Refrigeration systems Ceiling fan Blowers Hairdryers Clocks Pump drive Washing machines Vacuum cleaners Drills Compressors Food mixer Also, machines supplied by single-phase supply and produce around 1 HP output power. Of course, I don’t need to tell you why you can’t dispense those motors, yes you are...
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