Steinmetz Equation
The Steinmetz equation calculates the hysteresis loss.
Hysteresis loss (Ph) = ηB1.6max F V watts.
Where,
η = Steinmetz hysteresis coefficient.
Bmax = Maximum flux density in the armature winding.
F = Frequency of magnetic reversal.
V = armature volume in [Tex]m^3[/Tex].
Eddy Current Loss in a DC Machine
Faraday’s law of electromagnetic induction states that when an iron core rotates in a magnetic field, it generates an emf. Furthermore, as the armature spins in the attractive field, a little amount of emf is induced in the core, allowing charge to flow through the body due to the core’s conductivity. This current is unnecessary for the machine. This loss of current is known as eddy current. For DC machines, the loss is nearly always the same. It is possible that using a laminated core may limit its capabilities.
Mechanical Losses in DC Machine
Mechanical losses are those caused by the machine’s mechanical friction. These losses occur as a result of friction in the machine’s moving elements, such as bearings and brushes, as well as windage losses caused by air inside the machine’s revolving coil. These losses are typically small, accounting for just around 15% of full load losses.
Stray Losses in DC Machine
In addition to the losses mentioned above, there are a few more. These losses are referred to as “stray losses.” These various losses are due to short-circuit current in the commutating coil, flux distortion generated by the armature, and a variety of additional difficult-to-find losses. These catastrophes are difficult to decide. Regardless, they account for 1% of total load power production.
Construction And Working of a DC Generator
In 1831, Michael Faraday, a British physicist, devised the electromagnetic generator. The primary function of this device is to convert mechanical energy to electrical energy. There are several types of mechanical energy sources available, including hand cranks, internal combustion engines, water turbines, and gas and steam turbines. The generator provides capacity for all electrical power networks. An electric motor should be able to perform the generator’s converse function. The basic purpose of the motor is to convert electrical energy into mechanical energy. Generators and motors have many properties.
Table of Content
- DC Generator
- Construction of a DC generator
- Workings
- Types
- Losses in DC Machines
- Characteristics of DC Generator
- Characteristics of DC Series Generator
- Characteristics of DC Shunt Generators
- External Load Characteristics of the DC Compound Generator
- Efficiency of a DC Generator