The document discusses the design of commutators and brushes. It provides details on commutator construction including copper segments insulated by mica. The number of commutator segments equals the number of armature coils. Brush design considerations include the current collected by each brush arm, the brush cross-sectional area based on current density, and using multiple subdivided brushes. A 10-step design procedure is outlined covering commutator dimensions, segment pitch, number of segments, length, brush area, thickness, number of brushes, losses, and limiting the temperature rise.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
Design factors; Limitations; Modern trends; Electrical
Engineering Materials; Space factor; Choice of Specific
Electric and Magnetic loadings; Thermal Considerations;
Heat flow; Temperature rise; Insulating Materials; Properties;
Rating of Machines; Various Standard Specifications ;
This presentation is about power system voltage stability.
What is voltage stability?
How voltage instability occurs?
How to improve voltage stability of the system?
Design of substation (with Transformer Design) SayanSarkar55
This ppt is made for the subject Machine Design. Here the basic types, equipment, designs of substation is described with the preocess and calculation of designing a transformer also.
This directional over current relay employs the principle of actuation of the relay....It has a metallic disc free to rotate between the poles of two...
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.
The commutator and brush arrangement is used to convert bidirectional internal current to unidirectional external current or vice versa.
The current flows through the brush mounted on the commutator.
The brushes are located at magnetic neutral axis which is midway between two adjacent poles.
Types of commutation:
Resistance commutation
Retarded commutation
Accelerated commutation
Sinusoidal commutation
Design factors; Limitations; Modern trends; Electrical
Engineering Materials; Space factor; Choice of Specific
Electric and Magnetic loadings; Thermal Considerations;
Heat flow; Temperature rise; Insulating Materials; Properties;
Rating of Machines; Various Standard Specifications ;
This presentation is about power system voltage stability.
What is voltage stability?
How voltage instability occurs?
How to improve voltage stability of the system?
Design of substation (with Transformer Design) SayanSarkar55
This ppt is made for the subject Machine Design. Here the basic types, equipment, designs of substation is described with the preocess and calculation of designing a transformer also.
This directional over current relay employs the principle of actuation of the relay....It has a metallic disc free to rotate between the poles of two...
A synchronous motor is electrically identical with an alternator or AC generator.
A given alternator ( or synchronous machine) can be used as a motor, when driven electrically.
Some characteristic features of a synchronous motor are as follows:
1. It runs either at synchronous speed or not at all i.e. while running it maintains a constant speed. The only way to change its speed is to vary the supply frequency (because NS=120f/P).
2. It is not inherently self-starting. It has to be run up to synchronous (or near synchronous) speed by some means, before it can be synchronized to the supply.
3. It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power correction purposes, in addition to supplying torque to drive loads.
An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.
The commutator and brush arrangement is used to convert bidirectional internal current to unidirectional external current or vice versa.
The current flows through the brush mounted on the commutator.
The brushes are located at magnetic neutral axis which is midway between two adjacent poles.
Types of commutation:
Resistance commutation
Retarded commutation
Accelerated commutation
Sinusoidal commutation
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Terms related to armature winding.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
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2. COMMUTATOR
Function?
Rectify alternating current
Shape?
Cylindrically shaped
Essentials of construction?
No. of copper bars or segments are separated from one another.
What is Risers?
Connect segments to the armature coils.
3.
4. Segments?
Insulation?
mica or micanite
The number of commutator segments is equal to the number of
active armature coils.
The diameter of the commutator will generally be about (60 to
80)% of the armature diameter.
Dc =(0.6 to 0.8)D
The commutator peripheral velocity vc = ∏ DC N / 60
The commutator segment pitch ƮC = (outside width of one
segment + mica insulation between segments)
= ∏ DC / Number of segments
The outer surface width of commutator segment lies between 4
and 20 mm in practice.
5. The temperature rise of the commutator can be calculated by
using the following empirical formula.
Ѳ°C=
The different losses that are responsible for the temperature rise
of the commutator are
a. brush contact loss and
b. brush frictional loss.
120 × watt loss / cm of dissipating surface π DC Lc
1 + 0.1 vC
6. Brush contact loss = voltage drop / brush set × Ia
Brush frictional loss (due to all the brush arms) = frictional
torque in Nm × angular velocity
= frictional force in Newton x distance in metre × (2 ∏ N/60)
= 9.81 μ Pb Aball× (DC / 2) ×(2 ∏ N/60)= 9.81 μ Pb Aball vc
Aball =Ab× number of brush arms
7. BRUSH DETAILS
Following Points are considered when brushes are
1. designed current collected by each brush arm = (2Ia/p)
2. the cross-sectional area of the brush or brush arm or a holder
Ab = (2Ia/p δa)
3. The current density δa depends on the brush material
8. In order to ensure a continuous supply of power and cost of
replacement of damaged or worn out brushes is cheaper, a
number of subdivided brushes are used instead of one single
brush.
Thus if
i. tb is the thickness of the brush
ii. wb is the width of the brush and
iii. nb is the number of sub divided brushes.
Then Ab = tb wb nb
9. The number of brushes / spindle can be found out by assuming
a standard brush width or a maximum current / sub divided
brush.
Standard brush width can be 1.6, 2.2 or 3.2 cm.
Current/subdivided brush should not be more than 70A.
Width of each brush wb =
Ab
Nb tb
10. STEP BY STEP DESIGN PROCEDURE OF
COMMUTATOR AND BRUSHES
1. Diameter of the commutator Dc = (0.6 to 0.8) D and must be
such that the peripheral velocity of the commutator vC = π
Dc N / 60 is not more than 15 m/s as far as possible.
2. The commutator segment pitch Ʈc = π Dc / Number of
segments should not be less than 4 mm from the mechanical
strength point of view.
11. 3. The number of commutator segments is equal to number of
active armature coils.
4. Length of the commutator Lc = (width of the brush + brush
box thickness 0.5 cm) number of brushes / spindle nb + end
clearance 2 to 4 cm + clearance for risers 2 to 4 cm +
clearance for staggering of brushes 2 to 4 cm.
5. Cross-sectional area of the brush / spindle or arm or holder
Ab= (2Ia / p δa) cm²
12. 6. Maximum thickness of the brush tb max
= 4 Ʈc for machines greater than 50 kW
= 5 Ʈc for machines less than 50 kW
7. With standard brush width Wb assumed, the number of
brushes / spindle
nb=
7. Total commutator losses
= Brush contact loss + Brush frictional loss
= voltage drop / brush set × Ia + 9.81 μ Pb Aball vc
A b
t b Wb
13. 9. Temperature rise of the commutator
Ѳ°C= Cooling coefficient x watt loss / dissipating surface
= × watt loss / cm² of dissipating surface π Dc Lc
10. Temperature rise should be less than about 55°C.
120
1 + 0.1 vc