A DC motor converts direct current into mechanical energy. It works on the principle that a current-carrying conductor in a magnetic field experiences a force. There are three main types of DC motors: shunt wound motors which run at a constant speed, series wound motors which decrease in speed under load, and compound wound motors which have characteristics of both. The main parts of a DC motor are the yoke, poles, armature, field and armature windings, commutator, brushes, and shaft. Routine maintenance includes cleaning, inspecting brushes and commutator, checking bearings and connections, and testing annually.
A DC Motor is a machine which converts electrical energy into mechanical energy. It depends for its operation on the force which is known to exist on conductor carrying a current while situated in a magnetic field.
A DC Motor is a machine which converts electrical energy into mechanical energy. It depends for its operation on the force which is known to exist on conductor carrying a current while situated in a magnetic field.
An alternator is a device that converts mechanical energy into AC electrical energy. A generator is a mechanical device which converts mechanical energy to either AC or DC electrical energy. An alternator always induces an alternating current. ... Generators have a lower output when compared with an alternator.
The single-phase motor, which are designed to operate from a single-phase supply, are manufactured in a large number of types to perform a wide variety of useful services in home, offices, factories, workshops and in a business establishments etc.
Small motors, particularly in the frictional kW sizes are better known than any other. In fact, most of the new products of the manufacturers of space vehicles, aircrafts, business machines and power tools etc. have been possible due to of the advances made in the design of frictional kW motors. Since the performance requirements of the various applications differ so widely, the motor manufacturing industry has developed many different types of such motors, each being designed to meet specific demands.
Single-phase motors may be classified as under, depending on their construction and method of starting:
1. Induction Motors (split-phase, capacitor and shaded-pole etc.)
2. Repulsion Motors (sometime called inductive-series motor)
3. AC Series Motor, and
4. Un-excited Synchronous Motors
A presentation on Electric Motor and its working principle, components, it's classification, types of AC & DC motor, special types of motors & its application.
Breaking,Types of Electrical Braking system, Regenerative Braking, Plugging ...Waqas Afzal
Why Breaking?
Requirements for Braking
Types of Electrical Braking system
Regenerative Braking.
Plugging type braking.
Dynamic braking.
Breaking implementations at DC Motor and AC Motor
SELECTION OF DRIVES AND CONTROL SCHEMES FOR MACHINE TOOLS Praveen Kumar
SELECTION OF DRIVES AND CONTROL SCHEMES FOR MACHINE TOOLS
Machine tools and drives
Horse power requirement for driving the machine tools
MOTOR REQUIREMENTS FOR MACHINE TOOLS.
SELECTION OF MOTORS
Speed control of Drill press
Application of Motors to Planers, Shapers
Reversible motor drive quick return mechanism
GRINDING MACHINES
VFD
An alternator is a device that converts mechanical energy into AC electrical energy. A generator is a mechanical device which converts mechanical energy to either AC or DC electrical energy. An alternator always induces an alternating current. ... Generators have a lower output when compared with an alternator.
The single-phase motor, which are designed to operate from a single-phase supply, are manufactured in a large number of types to perform a wide variety of useful services in home, offices, factories, workshops and in a business establishments etc.
Small motors, particularly in the frictional kW sizes are better known than any other. In fact, most of the new products of the manufacturers of space vehicles, aircrafts, business machines and power tools etc. have been possible due to of the advances made in the design of frictional kW motors. Since the performance requirements of the various applications differ so widely, the motor manufacturing industry has developed many different types of such motors, each being designed to meet specific demands.
Single-phase motors may be classified as under, depending on their construction and method of starting:
1. Induction Motors (split-phase, capacitor and shaded-pole etc.)
2. Repulsion Motors (sometime called inductive-series motor)
3. AC Series Motor, and
4. Un-excited Synchronous Motors
A presentation on Electric Motor and its working principle, components, it's classification, types of AC & DC motor, special types of motors & its application.
Breaking,Types of Electrical Braking system, Regenerative Braking, Plugging ...Waqas Afzal
Why Breaking?
Requirements for Braking
Types of Electrical Braking system
Regenerative Braking.
Plugging type braking.
Dynamic braking.
Breaking implementations at DC Motor and AC Motor
SELECTION OF DRIVES AND CONTROL SCHEMES FOR MACHINE TOOLS Praveen Kumar
SELECTION OF DRIVES AND CONTROL SCHEMES FOR MACHINE TOOLS
Machine tools and drives
Horse power requirement for driving the machine tools
MOTOR REQUIREMENTS FOR MACHINE TOOLS.
SELECTION OF MOTORS
Speed control of Drill press
Application of Motors to Planers, Shapers
Reversible motor drive quick return mechanism
GRINDING MACHINES
VFD
Advantages and Disadvatages of AC/DC MotorFika Khamis
Simple explanation on advantages and disadvantages of AC and DC motor. Focusing on main point only since the slides is for presentation. Originally design by me.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
2. Working Principle of DC motor
A machine that converts DC power into mechanical energy is known as
DC motor. The basic working principle of a DC motor is: "whenever a
current carrying conductor is placed in a magnetic field, it experiences a
mechanical force". The direction of this force is given by Fleming's left
hand rule.
4. Types of DC motors
Shunt wound DC motor-Field winding is connected in parallel
with the armature. It runs practically constant speed at all
load. Its Starting torque is 1.5 to 2 times greater than its
Full Load torque. These type of motors are useful to drive a
Line shaft to which a number of machines are belted.
Series wound DC motor: Field winding is connected in series
With the armature. So that the load current flows from the field
And the armature. This motor has the characteristics of
Decreasing of speed with increasing the load. When there
Is no load on the motor the speed is very high. Hence this
Type of motor is never used without load.
This type of motor is useful for trams, cranes,trains,pumps
Trolly etc.
5. Types of DC motors
Compound wound DC motor:-It is having both series and
Shunt winding. This type of motor is used where high
Starting torque is required and load is fluctuating.
This motor is used for compressors ,refrigerator plant.
8. Main parts of DC machines
1) Yoke or Frame or Magnetic frame
2) Poles and Pole shoe
3) Armature
4) Armature winding and Field winding
5) Commutator
6) Brushes
7) Shaft
1) Yoke:
The yoke make by cast steel for large machines and cast iron for a small
machine. It uses to protect the internal parts of the DC machine and
gives mechanical support to the poles. The yoke provides a return path
for magnetic flux. In the yoke, the laminations are not required, but the
modern machines uses the laminations in yoke.
2) Poles and Pole shoe:
The pole core use to provide housing to the field winding. When field
winding excites, it behaves like a magnet. The pole shoes provide
mechanical support to the field winding and due to a large area, it
reduces the magnetic reluctance. The pole and pole shoe make by cast
steel. Pole is not necessary to laminate. The pole shoe is always
laminated because it is close to the armature.
9. Main parts of DC machines
3) Armature:
Armature core provides housing to the armature winding. It completes low
reluctance path for magnetic flux. The armature slots are skew at some angle to
reduce the mechanical vibration. Armature core is made with silicon steel. It is
laminated to reduce the eddy current losses.
4) Armature winding and Field winding:
There are two types of armature windings; Lap winding and Wave winding.
Lap winding is known as complete winding because, after completion of winding,
all slots does fill with armature winding. Wave winding is known as incomplete
winding because, after completion of winding, all slots does not fill with armature
winding. Some slots remain empty. These slots do fill with dummy coils. The
dummy coils only use in wave winding to fill empty slots and give mechanical
balance. It is not used in lap winding.
In lap winding, due to unbalance flux and unbalance voltage, the circulating
current is more. It causes more copper loss and heat. The circulating current can
minimise by using the equalizer ring. In wave winding, circulating current does
not exist.
The field winding connects with DC supply. Whenever the field winding is
energies, it produces the magnetic flux and poles behaves like a magnet.
10. 5) Commutator:
The commutator uses as a rectifier. In the case of the motor, the
commutator use to produce unidirectional torque. To reduce wear
and tear, the commutator make by hard drawn copper. The
number of armature slots is equal to the number of commutator
segments.
6) Brush:
Brushes use to carry the current or give the current to the
armature conductors through the commutator. The brushes make
by copper or carbon materials for small machines. Electro-graphite
brushes use for large machines. Carbon-graphite brushes use for
large current low voltage machines.
7) Shaft:
The shaft use to transfer mechanical power. In case of DC motor,
mechanical power is transfer from DC machine to load. In the case
of a DC generator, mechanical power is transfer from Prime mover
to the DC generator.
Main parts of DC machines
11. Maintenance of DC motor
1. Clean motor, blowing out dirt from windings, and wipe commutator and
brushes.
2. Visually inspect commutator.
3. Check and replace brushes that are more than half worn.
4. Examine brush holders, and clean them if dirty.
5. Check brush pressure and position.
6. Check grease in ball or roller bearings.
7. Check operating speed or speeds.
8. Technician to examine and tighten loose connections.
9. Test current input and compare it with normal.
10. Visually check drive, for smooth running, absence of vibration.
11. Check motor foot bolts.
Annually1. Remove and renew grease in ball or roller bearing.
2. Test insulation.
3. Clean out magnetic dirt that may be attached to poles.
4. Check the commutator for smoothness and slot damage.
5. Examine connections of commutator and armature coils.
.