幻灯片 1
... Linear Torque/Speed characteristics similar to shunt wound motors. Field magnetic flux is constant Current varies linearly with torque. Self-braking upon disconnection of electrical power Need to short + to – supply, May need resistance to dissipate heat. Magnets lose strength over time an ...
... Linear Torque/Speed characteristics similar to shunt wound motors. Field magnetic flux is constant Current varies linearly with torque. Self-braking upon disconnection of electrical power Need to short + to – supply, May need resistance to dissipate heat. Magnets lose strength over time an ...
i. introduction
... International Journal of Science, Engineering and Technology Research (IJSETR) Volume 1, Issue 1, July 2012 ...
... International Journal of Science, Engineering and Technology Research (IJSETR) Volume 1, Issue 1, July 2012 ...
A New Induction Motor V/F Control Method using Dspic30f5011
... drive using V/F control is shown in Fig. 3[6]. It has three phase full bridge rectifier, three phase full bridge inverter, control circuit, speed sensing circuit and output filter. In the proposed work, single phase KBPC3510 Rectifier Module is used instead of power diodes. Two single phase bridge r ...
... drive using V/F control is shown in Fig. 3[6]. It has three phase full bridge rectifier, three phase full bridge inverter, control circuit, speed sensing circuit and output filter. In the proposed work, single phase KBPC3510 Rectifier Module is used instead of power diodes. Two single phase bridge r ...
Tiny Amplifiers Drive Heavy Capacitive Loads at Speed
... time constant may limit performance. With a current feedback amplifier, increasing the feedback resistor, RF, is an alternative compensation method to reduce peaking. Tiny Current Feedback Amplifiers For the high speed, large capacitive load example above, the 400MHz LT1395/LT1396/LT1397 family of cur ...
... time constant may limit performance. With a current feedback amplifier, increasing the feedback resistor, RF, is an alternative compensation method to reduce peaking. Tiny Current Feedback Amplifiers For the high speed, large capacitive load example above, the 400MHz LT1395/LT1396/LT1397 family of cur ...
Optimization of the Electrical Motor Generator in Hybrid Automobiles
... Gas Turbine (GT) hybrid systems for Distributed Generation. Independent dynamic models of the main components of the systems have been realized and implemented in the Matlab-Simulink environment. The models have been used to simulate the behavior of two plant configurations. Control methodologies ha ...
... Gas Turbine (GT) hybrid systems for Distributed Generation. Independent dynamic models of the main components of the systems have been realized and implemented in the Matlab-Simulink environment. The models have been used to simulate the behavior of two plant configurations. Control methodologies ha ...
Slip Power recovery system in Three Phase Slip Ring Induction motor
... be returned to the supply or added to the motor shaft output. Instead of wasting the slip power in the rotor circuit resistance, it can be converted to 50 hz. AC supply and pumped back to the line. The slip power control drive that permits only a sub- synchronous range of speed control through a con ...
... be returned to the supply or added to the motor shaft output. Instead of wasting the slip power in the rotor circuit resistance, it can be converted to 50 hz. AC supply and pumped back to the line. The slip power control drive that permits only a sub- synchronous range of speed control through a con ...
Graham/Danfoss - Geo. M. Martin
... determining motor shaft speed is required (i.e., hand-held tachometer). This adjustment is provided to overcome the motors natural tendency to slow down with increasing load while operating in the speed mode. 1. Set motor speed to one-half of base speed rating. 2. Load motor to 100% nameplate curren ...
... determining motor shaft speed is required (i.e., hand-held tachometer). This adjustment is provided to overcome the motors natural tendency to slow down with increasing load while operating in the speed mode. 1. Set motor speed to one-half of base speed rating. 2. Load motor to 100% nameplate curren ...
Train Traction Systems for Passenger Comfort and Easier
... detected by a speed sensor installed on the motor. Such a speed sensor, however, operates under severe conditions in terms of vibration, temperature, and other factors, and consequently requires periodic maintenance. To solve this problem, Hitachi has developed speed sensorless vector control having ...
... detected by a speed sensor installed on the motor. Such a speed sensor, however, operates under severe conditions in terms of vibration, temperature, and other factors, and consequently requires periodic maintenance. To solve this problem, Hitachi has developed speed sensorless vector control having ...
Document
... use twin motor de drives for kiln application. In this case, two de motors with separate pinions drive the same gear wheel at the periphery of the kiln drum. Although this arrangement has certain advantages for the designer of electric motors, it does involve extra expenditure on the electrical side ...
... use twin motor de drives for kiln application. In this case, two de motors with separate pinions drive the same gear wheel at the periphery of the kiln drum. Although this arrangement has certain advantages for the designer of electric motors, it does involve extra expenditure on the electrical side ...
- sir cr reddy college of engineering
... and standstill leakage reactance 0.8ohms per phase if the full load slip is 5%.Determine the full load torque as a percent of maximum torque. What should be the value of external resistance per phase to give half the maximum torque at starting. 7derive the expression for the torque developed in a 3p ...
... and standstill leakage reactance 0.8ohms per phase if the full load slip is 5%.Determine the full load torque as a percent of maximum torque. What should be the value of external resistance per phase to give half the maximum torque at starting. 7derive the expression for the torque developed in a 3p ...
- sir cr reddy college of engineering
... and standstill leakage reactance 0.8ohms per phase if the full load slip is 5%.Determine the full load torque as a percent of maximum torque. What should be the value of external resistance per phase to give half the maximum torque at starting. 7derive the expression for the torque developed in a 3p ...
... and standstill leakage reactance 0.8ohms per phase if the full load slip is 5%.Determine the full load torque as a percent of maximum torque. What should be the value of external resistance per phase to give half the maximum torque at starting. 7derive the expression for the torque developed in a 3p ...
(Wmin x 0.6)+(Wmin x 2)+(2 x 0.6 x 2) > 7.8 m2
... pumps and compressors can be controlled by mechanical means to match the demands of the system, many of them do not consider the immense amount of energy, hence watts, hence money that can be saved by using modern reliable electronic technology. If the efficiency of the system can be improved the po ...
... pumps and compressors can be controlled by mechanical means to match the demands of the system, many of them do not consider the immense amount of energy, hence watts, hence money that can be saved by using modern reliable electronic technology. If the efficiency of the system can be improved the po ...
KB ELECTRONICS, INC. 12095 NW 39th Street, Coral Springs
... specification relates to the ability of the DC Drive to maintain the set speed of the motor (as expressed in percentage of base speed of the motor, typically 1/2% of 1750 RPM) at full load, as the line voltage fluctuates from the rated voltage by +/10%. Example: If the motor is set at 900 RPM at ful ...
... specification relates to the ability of the DC Drive to maintain the set speed of the motor (as expressed in percentage of base speed of the motor, typically 1/2% of 1750 RPM) at full load, as the line voltage fluctuates from the rated voltage by +/10%. Example: If the motor is set at 900 RPM at ful ...
Alternating Current Motors
... mechanical power but are increasingly being used in variable speed-control applications. • Advantages: They are popular because they can provide rotary power with high efficiency, low maintenance, and exceptional reliability—all at relatively low cost. • These desirable qualities are the result of t ...
... mechanical power but are increasingly being used in variable speed-control applications. • Advantages: They are popular because they can provide rotary power with high efficiency, low maintenance, and exceptional reliability—all at relatively low cost. • These desirable qualities are the result of t ...
SUBJECT: GENERAL PERFORMANCE
... specification relates to the ability of the DC Drive to maintain the set speed of the motor (as expressed in percentage of base speed of the motor, typically 1/2% of 1750 RPM) at full load, as the line voltage fluctuates from the rated voltage by +/10%. Example: If the motor is set at 900 RPM at ful ...
... specification relates to the ability of the DC Drive to maintain the set speed of the motor (as expressed in percentage of base speed of the motor, typically 1/2% of 1750 RPM) at full load, as the line voltage fluctuates from the rated voltage by +/10%. Example: If the motor is set at 900 RPM at ful ...
HSC Physics – Core Module 1 – Space
... They have a low power factor at light loads. This means that the mechanical power produced is low compared with the electrical power consumed. They are basically fixed speed machines The starting torque is relatively low. In other words – they do not get heavy loads moving very quickly The speed of ...
... They have a low power factor at light loads. This means that the mechanical power produced is low compared with the electrical power consumed. They are basically fixed speed machines The starting torque is relatively low. In other words – they do not get heavy loads moving very quickly The speed of ...
Introduction Gencontroller C6200 SELCO is introducing the integrated synchronizing
... C6200 offers 8 programmable inputs and outputs. The outputs can be programmed to load depending start and stop functions. In case the load of the running gensets increases above a predefined limit, the next available generator will be started. In case the load drops below a predefined limit, the next ...
... C6200 offers 8 programmable inputs and outputs. The outputs can be programmed to load depending start and stop functions. In case the load of the running gensets increases above a predefined limit, the next available generator will be started. In case the load drops below a predefined limit, the next ...
machines unit 1
... ability of the motor to maintain a desired position while under external load. The torque curve may be extended by using current limiting drivers and increasing the driving voltage (sometimes referred to as a 'chopper' circuit; there are several off the shelf driver chips capable of doing this in a ...
... ability of the motor to maintain a desired position while under external load. The torque curve may be extended by using current limiting drivers and increasing the driving voltage (sometimes referred to as a 'chopper' circuit; there are several off the shelf driver chips capable of doing this in a ...
E701 ELECTRICAL MACHINES III
... 1. The frequency of e.m.f in the stator of a 4 pole induction motor is 50 Hz and that in the rotor is 1.5 Hz. What is the slip and at what speed the motor is running? 2. A 3.3kV, 20 pole, 50 Hz, 3 phase Induction Motor has rotor resistance and standstill reactance of 0.014Ω and 0.113Ω per phase resp ...
... 1. The frequency of e.m.f in the stator of a 4 pole induction motor is 50 Hz and that in the rotor is 1.5 Hz. What is the slip and at what speed the motor is running? 2. A 3.3kV, 20 pole, 50 Hz, 3 phase Induction Motor has rotor resistance and standstill reactance of 0.014Ω and 0.113Ω per phase resp ...
UNIVERSAL MOTOR - Home
... Motors Using a Microcontroller” 0197-2618/07/$25.00 © 2007 IEEE [2] Hac1 Bodur, A. Faruk Bakan, M. Hadi Sarul Yildiz Technical University, Dept. of Electrical ...
... Motors Using a Microcontroller” 0197-2618/07/$25.00 © 2007 IEEE [2] Hac1 Bodur, A. Faruk Bakan, M. Hadi Sarul Yildiz Technical University, Dept. of Electrical ...
LPH200-400 - Avtron Froment
... The Avtron LPH400 Load Bank is ideal for routine load testing of standby diesel generating systems or for factory production line testing of (UPS) Uninterruptible Power Supplies, turbines, or engine generator sets. This model provides resistive loading up to 400 KW at either 240/480 or 480 Volts AC ...
... The Avtron LPH400 Load Bank is ideal for routine load testing of standby diesel generating systems or for factory production line testing of (UPS) Uninterruptible Power Supplies, turbines, or engine generator sets. This model provides resistive loading up to 400 KW at either 240/480 or 480 Volts AC ...
IM ppt File
... •In a conventional DC machine field is stationary and the current carrying conductors rotate. •We can obtain similar results if we make field structure rotating and current carrying conductor stationary. ...
... •In a conventional DC machine field is stationary and the current carrying conductors rotate. •We can obtain similar results if we make field structure rotating and current carrying conductor stationary. ...
Selection and Modeling of PMBLDC Motor for Torque Ripple
... The parameter of 500 W BLDC motor is represented by Table I and its back-EMF is shown in Fig. 4. The back-EMF is obtained by experiment and inductances of each phase are measured by digital LCR meter. The 500WBLDC motor is simulated by the Mat lab with the parameters of that is not only the BLDC mot ...
... The parameter of 500 W BLDC motor is represented by Table I and its back-EMF is shown in Fig. 4. The back-EMF is obtained by experiment and inductances of each phase are measured by digital LCR meter. The 500WBLDC motor is simulated by the Mat lab with the parameters of that is not only the BLDC mot ...
The Polyphase Induction Motor
... which maximum torque is produced does vary with rotor resistance as shown by the dotted characteristics in Fig. 3. Normally the rotor resistance is maintained at as low a value as possible in order to keep the losses low and the efficiency high. This further leads to good speed regulation, i.e., sma ...
... which maximum torque is produced does vary with rotor resistance as shown by the dotted characteristics in Fig. 3. Normally the rotor resistance is maintained at as low a value as possible in order to keep the losses low and the efficiency high. This further leads to good speed regulation, i.e., sma ...
Dynamometer
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A dynamometer or ""dyno"" for short, is a device for measuring force, torque, or power. For example, the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM).A dynamometer can also be used to determine the torque and power required to operate a driven machine such as a pump. In that case, a motoring or driving dynamometer is used. A dynamometer that is designed to be driven is called an absorption or passive dynamometer. A dynamometer that can either drive or absorb is called a universal or active dynamometer.In addition to being used to determine the torque or power characteristics of a machine under test (MUT), dynamometers are employed in a number of other roles. In standard emissions testing cycles such as those defined by the United States Environmental Protection Agency (US EPA), dynamometers are used to provide simulated road loading of either the engine (using an engine dynamometer) or full powertrain (using a chassis dynamometer). In fact, beyond simple power and torque measurements, dynamometers can be used as part of a testbed for a variety of engine development activities, such as the calibration of engine management controllers, detailed investigations into combustion behavior, and tribology.In the medical terminology, hand-held dynamometers are used for routine screening of grip and hand strength, and the initial and ongoing evaluation of patients with hand trauma or dysfunction. They are also used to measure grip strength in patients where compromise of the cervical nerve roots or peripheral nerves is suspected.In the rehabilitation, kinesiology, and ergonomics realms, force dynamometers are used for measuring the back, grip, arm, and/or leg strength of athletes, patients, and workers to evaluate physical status, performance, and task demands. Typically the force applied to a lever or through a cable is measured and then converted to a moment of force by multiplying by the perpendicular distance from the force to the axis of the level.