How intensively the electric circuit is used the type of enclosure type of cooling the duty cycle of the load the frequency of starting and stopping s 34. The following is the sizing procedure for generator single or multisets. Dl tesla average magnetic flux density over airgap surface ac 32t phi ph. This course is intended to prepare the target persons with the ability to understand and recognize different types, components, theory of operation and applications of all electrical motors. The electric motor operation is based on the following points. Here are some of the things a designer needs to know in order to make an accurate winding calculation. How to calculate winding data of a motor for particular hp. This conversion is taking place with an associated loss. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Due to the discontinuity of gas flow of reciprocating compressor, gas pulsation will occur if excitation frequency is near or.
Their design implements the common idea interaction of the magnetic fields with permanent magnets, ferromagnetics and electric currents carrying conductors to produce the mechanical forces and torques. This guidebook is an informational resource that identifies motorrelated considerations that affect the. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion. Further information and full design support can be found at. Equation 2 example annual energy cost savings calculation with upgrade to nema. Electric motor performance successfully tested at a continuous mechanical power of 261 kw at 2500 rpm excellent thermal behavior motor can drive propeller directly without gearbox motor was developed for aircraft application motor design is scalable towards 1 mw this is the strongest motor, ever built with. In this paper, a driving system of electric vehicle ev based on antidirection dualrotor motor addrm is investigated, and the corresponding mathematical modeling and. Easy to predict motor performance for a three phase design, notoriously difficult for a single phase design. The siemens motor would actually operate at 1768 rpm. Motor technologies for compliance with new effi ciency classes. Other members of the family are the direct current dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. Staton in this book two of the most experienced authors in the field have come together to. Electric propulsion components with high power densities. Start and running torque requirements, calculations for electric motors.
The following is an approximate electric power demand calculation. Staton in this book two of the most experienced authors in the field have come together to present a practical guide to. For this exercise we are going to use an average efficiency. Electric motor design software quickfield fea software. The direct current dc supplied by the battery is converted into alternated current ac by the inverter. As a result, necessary reinforcement measures hinder to fully exploit the new freedom in design given by the electrification of the vehicle. Ed thornton is an electrical consultant in the electrical technology consulting group in engineering at dupont, in houston, texas.
Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. The treatment throughout the handbook is practical with very little emphasis on theory. Associate professor, electrical and computer engineering, university of missourirolla. Pb the arizona department of commerce energy office has recommended against using the slip technique as an indicator of load and suggests that loads be estimated by comparing a motors true rootmeansquare rms amperage draw against its fullload or nameplate value. Propulsion system design and sizing of an electric vehicle. Motor cad is a unique software for thermal analysis of electric machines and generators, closely linked to speed. Types, losses in induction motors, motor efficiency, factors.
Motor engineer provides high level technical consulting services for the electric motor and generator design market worldwide. This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. Design of an efficient, low weight battery electric. Building an inboard electric boat from a 14 ft oday javelin.
Motor design software by motor design engineers motor design limited mdl is a world leader in the development of advanced software design tools for electrical machines. Mdl uses its expert knowledge of electric motor design to provide software and support to electric machine designers at some of the worlds most prestigious companies. He is a registered professional engineer in the state of. Electric motor sizing design equations and calculator. Pdf electric vehicle design, modelling and optimization. Repeating this procedure for the instants 2, 3, 4, 5 and 6 of figure 1. The traction motor used is the permanent magnet synchronous motor pmsm and three phase induction motor im. Some one has hijacked one of your links electrical formulas and calculations. Motor cad enables design engineers to evaluate motor topologies and concepts across the full operating range, to produce designs that are optimized for performance, efficiency and size. Once each part of the design plan has been defined, the next stage is to design each part to industryrecognized standards as well as any additional stan. The construction monkey motor calculator lets you figure out electrical characteristics of your system given a specific motor. The motor has the toque to move our vehicle, is specifically made for electric vehicles, and has a dual shaft for accessory mounting. Maximum efficiency is usually near 75% of rated load.
The battery pack will be designed for an average energy consumption of 161. This guidebook is an informational resource that identifies motor related considerations that affect the. A battery cell can be regarded as the smallest division of the voltage. Motors and magnetek products both exhibit fullload efficiencies of 89. Once the motor efficiency has been determined and the input power is known, you can calculate output power. The following steps adhere to article 430 of the nec. The phase relation between the rotor and stator magnetic field i. Mechanics and machine design, equations and calculators. Inclusion of suitable graphs and illustrations to clarify the procedure. Electric machine transducer for converting electrical energy to mechanical energy or mechanical energy to electrical energy. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque.
Motorcad enables design engineers to evaluate motor topologies and concepts across the full operating range, to produce designs that are optimized for performance, efficiency and size. Not a motor of choice for new applications, however is still attractive for some space applications when. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three. His specialty is the design, operation, and maintenance of electric power distribution systems and large motor installations. The simulation model consists of the following blocks. Also, the electric motor and driveline have some losses which we need to consider. Thus, a 10horsepower hp motor has an acceptable load range of 5 to 10 hp. All high voltage battery packs are made up from battery cells arranged in strings and modules. An electric motor is a device converting electrical energy into mechanical. Efficiency of the motor is calculated as mechanical output power divided by electrical input power. Electric machine design using speed and motor cad, by t. These modifications require extensive adoptions in order to integrate the battery in a safe and sound manner.
Electric motor efficiency under variable frequencies and loads itrc report no. Motorcad is a unique software for thermal analysis of electric machines and generators, closely linked to speed. An introduction to electrical motors basics course description. Mechanical energy what is an electric motor an electric motor is a device converting electrical energy into mechanical energy usually a torque. Standard induction motor copper rotor motor permanentmagnet pm motor ec motor special case linestart pm motor synchronous reluctance motor many electric motors and drives waste energy because they do not run in the optimal operating range. If the circuit components are connected end to end to form a single loop it is a seriescircuit. Motor efficiency, selection, and management xcel energy. This amperage is for the original conditions with a motor pulley of 8, a blower rpm of 875, and the 3000 cfm airflow rate. Overhead transmission lines and underground cables 9. The temperature of the cylinder head in a diesel engine is to be remotely indicated. Electric machine design using speed and motorcad, by t. There are more than 25 new or enhanced features in this latest release, including. At least one of the two magnetic field is generated by a solenoid carrying a current.
Drives general 4 motor operation with converter supply 6 motor current waveforms 6 discontinuous current 9 converter output impedance. Building an inboard electric boat from a 14 ft oday. Electric motors are devices for conversion of the electrical energy into mechanical energy. Record all nameplate information for the induction motor. The motors have enough torque and speed to do all kinds of experiments and calculations.
The handbook contains a wide array of topics and each topic is written by an authority on the subject. Inwheel motor design for an electric scooter 2314 j electr eng techno l. In order to construct a building that will last into the future, a strong foundation is a prerequisite. This relatively simple, yet comprehensive format adds greatly to the use of the hand. Advanced electric vehicle architectures deliverable d6. The handbook of electric power calculationsprovides detailed stepbystep calculation procedures commonly encountered in electrical engineering. Its operation is based on the principle that when a current carrying conductor is placed in a. The motor constant is a function of the coil design and the strength and. It is the responsibility of the customer to specify the required motor hp, torque and accelerating time for his application. Commercial and industrial wiring table of contents unit i. The blower rpm required to move 4000 cfm on this system is 1167 rpm. He has 20 years of consulting experience with dupont.
By inputting horsepower, motor efficiency, power factor, and system voltage the system will calculate the disconnect size, feeder size, and starter size. Motor technologies for higher efficiency in applications. Place the appropriate known values into the formula, cross multiply and divide, and the answer are provided. The running amperage under those conditions was found to be 16 amps. A motor s efficiency tends to decrease dramatically below about 50% load. The synchronous electrical generator also called alternator belongs to the family of electric rotating machines.
The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. Loadflow analysis in power systemsgalli, anthony w. Make your selections below and the form will automatically. Figure 4 shows typical gas flow diagram in reciprocating compressor. Motor formulas and calculations, index of helpful tools. Industrial electric motor application, design industrial electric motor supply. Reasons to determine motor loading most electric motors are designed to run at 50% to 100% of rated load. All other considerations such as operation, maintenance, aes. Structural design optimization of electric motors to improve torque performance by jaewook lee a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy mechanical engineering in the university of michigan 2010 doctoral committee.
Cross multiply 4000 times 875 to get 3,500,000 then divide that by 3000 to get 1166. Any design to the 17th edition of the iee wiring regulations bs 7671 must be primarily concerned with the safety of persons, property and livestock. Design of an efficient, low weight battery electric vehicle. Determining electric motor load and efficiency energy. An introduction to electric motors home stmicroelectronics. The steps cover motor full load currents, branch circuit sizing, branch circuit overload protection, feeder sizing, and feeder over current protection sizing for single and threephase, alternating current motors of more than 1 horsepower. Replacing an oversized and underloaded electric motor. Professor noboru kikuchi, chair professor kamal sarabandi. You should also make a dc measurement of stator winding linetoline resistance using a dmm. Measuring the torque of the motor is a challenging task. Electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor. When determining the torque requirements for a electric motor, consideration should be given to the load and start time demands during the start duration, operating torque, and peak load torque.
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