Control characteristics for quasi-optimal operation of switched
... The second motor, EMS-71, is a three-phase motor designed for rectifier supply: m=3, UN=310 V;PN=0.75 kW; nN=3,00 rpm; phase resistance (20°C), R=1.87 ; insulation class, H; nominal current, not specified; main dimensions, 200 mm·160 ...
... The second motor, EMS-71, is a three-phase motor designed for rectifier supply: m=3, UN=310 V;PN=0.75 kW; nN=3,00 rpm; phase resistance (20°C), R=1.87 ; insulation class, H; nominal current, not specified; main dimensions, 200 mm·160 ...
Chapter6 -Independant Project
... capacitors, op-amps, and transistors. For the most part, the circuits were pre-specified, requiring you to only choose the value of a resistor or two at most. In reality, you are likely to encounter applications where you must do much more substantial design of a circuit because the only information ...
... capacitors, op-amps, and transistors. For the most part, the circuits were pre-specified, requiring you to only choose the value of a resistor or two at most. In reality, you are likely to encounter applications where you must do much more substantial design of a circuit because the only information ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.1, pp. 1716-1726
... In the present paper, a three-phase SCIM rated 3 HP, 220 V, 1430 RPM is fed by a sinusoidal PWM inverter has been considered for analysis purpose. The sinusoidal reference wave base frequency is used 50 Hz while the triangular carrier wave's frequency is calculated and set to 1650 Hz. The modulation ...
... In the present paper, a three-phase SCIM rated 3 HP, 220 V, 1430 RPM is fed by a sinusoidal PWM inverter has been considered for analysis purpose. The sinusoidal reference wave base frequency is used 50 Hz while the triangular carrier wave's frequency is calculated and set to 1650 Hz. The modulation ...
InstaSPIN-FOC - Texas Instruments
... In the “Lab Exercises” folder, open the file “03 FOC Speed Control”, and follow the directions in the file. This exercise lets you build a field oriented speed loop by connecting together “Lego” style control blocks. If connected correctly, the speed and current plots should look like the pictures s ...
... In the “Lab Exercises” folder, open the file “03 FOC Speed Control”, and follow the directions in the file. This exercise lets you build a field oriented speed loop by connecting together “Lego” style control blocks. If connected correctly, the speed and current plots should look like the pictures s ...
Application Note 1501: Brushless Sine Drives
... motors with measurable mechanical friction, and when the Hall-effect signals are well aligned with the motor’s electrical phases. The benefit of “trap drives” is that they tend to be lower cost for a given current rating, and since the Hall sensors always report the absolute position of the rotor, t ...
... motors with measurable mechanical friction, and when the Hall-effect signals are well aligned with the motor’s electrical phases. The benefit of “trap drives” is that they tend to be lower cost for a given current rating, and since the Hall sensors always report the absolute position of the rotor, t ...
Microelectromechanical Devices
... robustness of construction. They also offer the advantages of only having to provide positive currents, simplifying the inverter design. Also, shoot-through faults are not an issue because each of the main switching devices is connected in series with a motor winding. However, the drawbacks of this ...
... robustness of construction. They also offer the advantages of only having to provide positive currents, simplifying the inverter design. Also, shoot-through faults are not an issue because each of the main switching devices is connected in series with a motor winding. However, the drawbacks of this ...
Requests for Information NLH-12 NP
... IEEE Standard 1147-1991 (IEEE Guide for Rehabilitation of Hydroelectric Power Plants) discusses criteria for the rehabilitation of hydroelectric power plants. In section 4.3.1 of the standard it states, “The stator is a component that deteriorates with time and temperature. A large percentage of out ...
... IEEE Standard 1147-1991 (IEEE Guide for Rehabilitation of Hydroelectric Power Plants) discusses criteria for the rehabilitation of hydroelectric power plants. In section 4.3.1 of the standard it states, “The stator is a component that deteriorates with time and temperature. A large percentage of out ...
D N IAGNOSTIC
... In past articles I have talked about maintenance high potential (hipot) testing of stator windings. It seems that about 50% of large utilities do such routine hipots every 5 to 10 years or so to find serious stator winding insulation defects. Few industrial operators of motors and generators seem to ...
... In past articles I have talked about maintenance high potential (hipot) testing of stator windings. It seems that about 50% of large utilities do such routine hipots every 5 to 10 years or so to find serious stator winding insulation defects. Few industrial operators of motors and generators seem to ...
servo control facts
... motor to rotate at the same speed (in synchronization) as the stator field. There are basically two types of synchronous motors: self excited ( as the induction motor) and directly excited (as with permanent magnets). The self excited motor (may be called reluctance synchronous) includes a rotor wit ...
... motor to rotate at the same speed (in synchronization) as the stator field. There are basically two types of synchronous motors: self excited ( as the induction motor) and directly excited (as with permanent magnets). The self excited motor (may be called reluctance synchronous) includes a rotor wit ...
Induction motor rotor bars
... Figure 1: Typical induction motor speed torque curve for two types of rotor. Changing the design of the rotor by replacing the brass or other high resistance bars on the outer cage of a double cage rotor will affect the starting torque or current, efficiency and characteristic of the motor. ...
... Figure 1: Typical induction motor speed torque curve for two types of rotor. Changing the design of the rotor by replacing the brass or other high resistance bars on the outer cage of a double cage rotor will affect the starting torque or current, efficiency and characteristic of the motor. ...
Preview of Period 17: Induction Motors and Transformers
... near a magnet causes the magnet to move. ♦ The current induces a changing magnetic field around the wire. ♦ The changing magnetic field alternately attracts and repels another magnet. ♦ The interaction between these magnetic fields causes the motor’s rotor to spin. The opposite is also true. A movin ...
... near a magnet causes the magnet to move. ♦ The current induces a changing magnetic field around the wire. ♦ The changing magnetic field alternately attracts and repels another magnet. ♦ The interaction between these magnetic fields causes the motor’s rotor to spin. The opposite is also true. A movin ...
Laboratory Manual
... 7 times their full load current & develops only 1.5 to 2.5 times their full load torque. This will produce large line drop affect the operation of other electrical equipment connected in same circuit. Starters should be used for the motors of rating above 25 KW to 40KW. TYPES OF STARTER The current ...
... 7 times their full load current & develops only 1.5 to 2.5 times their full load torque. This will produce large line drop affect the operation of other electrical equipment connected in same circuit. Starters should be used for the motors of rating above 25 KW to 40KW. TYPES OF STARTER The current ...
synchronous
... EXAMPLE 6.1In a factory a 3cp, 4 kV, 400 kVA synchronous machine is installed along with other induction motors. The following are the loads on the machines:Induction motors: 500 kVA at 0.8 PF lagging.Synchronous motor: 300 kVA at 1.0 PF.(a) Compute the overall power factor of the factory loads.(b) ...
... EXAMPLE 6.1In a factory a 3cp, 4 kV, 400 kVA synchronous machine is installed along with other induction motors. The following are the loads on the machines:Induction motors: 500 kVA at 0.8 PF lagging.Synchronous motor: 300 kVA at 1.0 PF.(a) Compute the overall power factor of the factory loads.(b) ...
Brush DC Motor Runs Along - Power Transmission Engineering
... experience in the design of all types of electric motors and generators from 10 W to 500 kW and has held engineering design, management and marketing management positions at a number of companies. He is recognized as an international authority on electric motors and motion control. He has written 25 ...
... experience in the design of all types of electric motors and generators from 10 W to 500 kW and has held engineering design, management and marketing management positions at a number of companies. He is recognized as an international authority on electric motors and motion control. He has written 25 ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.