Table of Contents
- 1 How do you Minimise the iron losses in DC machine?
- 2 How do dc machines reduce losses?
- 3 What are the constant losses in a DC machine?
- 4 How can we reduce iron losses?
- 5 What power is lost in the stator?
- 6 What is the efficiency of dc motor?
- 7 How is iron loss reduced in synchronous motor?
- 8 How are iron losses reduced in a transformer?
How do you Minimise the iron losses in DC machine?
Hence to reduce the iron losses of a transformer we have to reduce these losses. Hysteresis losses are reduced by using a core material of smaller loop area and adding a small amount of silicon in core material.
How do motors reduce iron losses?
By increasing the number of poles, the length of the end turn windings is reduced and thus the copper usage can be reduced and the stator copper loss reduced. The thickness of the stator yoke is also reduced and therefore the usage of core material for the yoke is reduced.
How do dc machines reduce losses?
How to Minimize Loses In DC Machine? Losses in DC machines mainly occur from three different sources like resistive, magnetic & switching. To reduce magnetic and hysteresis losses, cover the magnetic core so that eddy currents can be prevented.
What is the basic cause of iron losses in DC machines?
Iron loss consists of hysteresis and eddy current losses caused by changing flux densities in the iron core. Hysteresis loss incurs in revolving armature and teeth of a dc machine.
What are the constant losses in a DC machine?
Magnetic Losses or Core Losses or Iron Losses in dc machine The core losses are the hysteresis and eddy current losses. These losses are considered almost constant as the machines are usually operated at constant flux density and constant speed. These losses are about 20 per cent of the full load losses.
What are the losses of DC motor?
FAQ: What are rotational losses in DC motors?
- Mechanical losses. As their name suggests, mechanical losses are caused by movement of the motor.
- Magnetic losses (aka core losses or iron losses)
- Copper losses (aka electrical losses or winding losses)
- Brush losses.
- Stray load losses.
How can we reduce iron losses?
Therefore to reduce the iron losses in a transformer, the core should be made of a material having high permeability and high resistivity since high permeability helps in carrying high magnetic flux and high resistivity helps out by preventing eddy currents by providing low conductivity.
How can we reduce losses in transformer?
Methods to reduce the energy loss in transformer:
- Use of low resistance wire for the winding of the coil.
- Heat loss due to eddy current can be reduced by the lamination of the iron core.
- The heat generated can be kept to a minimum by using a magnetic material which has a low hysteresis loss.
What power is lost in the stator?
Motor power flow Power is then lost in the stator circuit, and the stator core. The remaining power is transferred to the rotor. Deducting the rotor losses, one obtains the power converted to the mechanical system.
What are the losses occur in DC motor?
The losses that occur in a DC Machine is divided into five basic categories. The various losses are Electrical or Copper losses (I2R losses), Core losses or Iron losses, Brush losses, Mechanical losses, Stray load losses. These losses are explained below in detail.
What is the efficiency of dc motor?
The value of the efficiency of a DC motor could typically be in the range of 70 to 85%. Larger the machine higher will be the efficiency. Losses consist of Armature and field copper losses, core loss, friction and windage loss.
Where do iron losses occur in a DC machine?
Iron or Core losses These losses occur in the armature of a d.c. machine and are due to the rotation of armature in the magnetic field of the poles. They are of two types viz.,
How is iron loss reduced in synchronous motor?
AMM has also been used to manufacture the stator of a synchronous reluctance motor [14]. The motor, driven by an inverter in load condition, has shown a reduction in iron loss by 63% at 8500 rpm, compared to the same motor using silicon steel.
How does a d.c.machine reduce the loss?
In order to reduce this loss in a d.c. machine, armature core is made of such materials which have a low value of Steinmetz hysteresis co-efficient e.g.,silicon steel. In addition to the voltages induced in the armature conductors, there are also voltages induced in the armature core.
How are iron losses reduced in a transformer?
If they are to be measured by a wattmeter, the iron losses must be reduced in magnitude to a value when they are negligible compared with the copper losses. The easiest way of reducing the iron losses in a given transformer is to reduce the magnetic flux density to a low value and this can be done by reducing the applied voltage.