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... amplitude torques. Typically, hydro units have mechanical parameters that are less prone to SSR problems than thermal units. Sub-synchronous oscillations were first discussed in 1937 [1,2] and until 1971, shaft torsional oscillations were neglected. Two shaft failures at the Mohave Generating Statio ...
... amplitude torques. Typically, hydro units have mechanical parameters that are less prone to SSR problems than thermal units. Sub-synchronous oscillations were first discussed in 1937 [1,2] and until 1971, shaft torsional oscillations were neglected. Two shaft failures at the Mohave Generating Statio ...
EDE1200 Unipolar Stepper Motor IC EDE1200
... Direction (pin 7): 1 = clockwise, 0 = counter-clockwise (If a clockwise command causes counterclockwise rotation of motor, reverse the sequence of the motor’s four phase wires.) Half-Stepping (pin 8): 1 = normal stepping, 0 = half stepping (doubles step resolution) With the EDE1200 running at an ext ...
... Direction (pin 7): 1 = clockwise, 0 = counter-clockwise (If a clockwise command causes counterclockwise rotation of motor, reverse the sequence of the motor’s four phase wires.) Half-Stepping (pin 8): 1 = normal stepping, 0 = half stepping (doubles step resolution) With the EDE1200 running at an ext ...
Application of LMD18245 in Two Phase Hybrid Stepping Motor Driver
... This scheme provides a digital path for controlling the motor current and 1/5 microstepping. In this paper we use an external digital-to-analog converter(DAC) to provide voltage reference, use LMD18245 to achieve bipolar chopper drive. The two input signals (voltage reference) for LMD18245 are sinus ...
... This scheme provides a digital path for controlling the motor current and 1/5 microstepping. In this paper we use an external digital-to-analog converter(DAC) to provide voltage reference, use LMD18245 to achieve bipolar chopper drive. The two input signals (voltage reference) for LMD18245 are sinus ...
Load Characteristics
... Load - Frequency characteristic of typical loads. An example of the characteristics of an induction motor driven fan type load. Load Frequency Characteristicsa Normally, loads are a function of frequency. For example, a fan driven by an induction machine slows down and consumes lesser power if frequ ...
... Load - Frequency characteristic of typical loads. An example of the characteristics of an induction motor driven fan type load. Load Frequency Characteristicsa Normally, loads are a function of frequency. For example, a fan driven by an induction machine slows down and consumes lesser power if frequ ...
PDF
... The stator is directly connected to the AC mains, where as the wound rotor is fed from the Power Electronic Converters via slip rings to allow DIFG to operate at a variety of speeds in response to changing wind speed. The idea is to introduce a frequency converter between the variable frequency indu ...
... The stator is directly connected to the AC mains, where as the wound rotor is fed from the Power Electronic Converters via slip rings to allow DIFG to operate at a variety of speeds in response to changing wind speed. The idea is to introduce a frequency converter between the variable frequency indu ...
ELEC34 - aes journals
... unequal phase voltage and/or currents, poor or damaged terminal contacts to motor, unbalanced load distribution on one or more phases, faulty power factor correcting equipment installed on one or more phases etc. The unbalanced supply fault although external to motor, might result in damage to motor ...
... unequal phase voltage and/or currents, poor or damaged terminal contacts to motor, unbalanced load distribution on one or more phases, faulty power factor correcting equipment installed on one or more phases etc. The unbalanced supply fault although external to motor, might result in damage to motor ...
DC Generator - UniMAP Portal
... The brush voltage drop represented by battery, Vbrush opposing the direction of current flow in the machine. ...
... The brush voltage drop represented by battery, Vbrush opposing the direction of current flow in the machine. ...
Basic Principles and Functions of Electrical Machines
... Electric motors and generators are a group of devices used to convert mechanical energy into electrical energy, or electrical energy into mechanical energy, by electromagnetic means. A machine that converts mechanical energy into electrical energy is called a generator, alternator, or dynamo, and a ...
... Electric motors and generators are a group of devices used to convert mechanical energy into electrical energy, or electrical energy into mechanical energy, by electromagnetic means. A machine that converts mechanical energy into electrical energy is called a generator, alternator, or dynamo, and a ...
Sérgio CRUZ 1,2 , Flávio GASPAR 2
... When the inertia of the load is very high, the speed oscillations of the motor will be very small, and that ellipse will tend to a circumference. On the other hand, for extremely low values of the inertia, the ellipse tends to degenerate into a straight line oriented along the second quadrant of th ...
... When the inertia of the load is very high, the speed oscillations of the motor will be very small, and that ellipse will tend to a circumference. On the other hand, for extremely low values of the inertia, the ellipse tends to degenerate into a straight line oriented along the second quadrant of th ...
KBMD DC MOTOR SPEED CONTROL QUICK
... DECELERATION (DECEL): Sets the ramp-down time when the Main Speed Potentiometer is adjusted to a lower speed. Units: Seconds MINIMUM SPEED (MIN): Sets the minimum speed of the motor when the Main Speed Potentiometer is set fully counterclockwise. Units: % Base Speed MAXIMUM SPEED (MAX): Sets the max ...
... DECELERATION (DECEL): Sets the ramp-down time when the Main Speed Potentiometer is adjusted to a lower speed. Units: Seconds MINIMUM SPEED (MIN): Sets the minimum speed of the motor when the Main Speed Potentiometer is set fully counterclockwise. Units: % Base Speed MAXIMUM SPEED (MAX): Sets the max ...
Electric Service Standards
... service is already being supplied. Motors 7.5 to 20 horsepower require open delta service (or wye if already being supplied), and motors larger than 20 horsepower require wye service. Availability of three phase service should be discussed in advance with FPL. Single phase motors larger than one-hal ...
... service is already being supplied. Motors 7.5 to 20 horsepower require open delta service (or wye if already being supplied), and motors larger than 20 horsepower require wye service. Availability of three phase service should be discussed in advance with FPL. Single phase motors larger than one-hal ...
Dahlander motor
... are suitable for use on low-powered motors only. Motors equipped with such contacts can be started and de-energized via any commercially available installation switch, provided they are of the single-speed type. For dual-speed motors a special rotary switch must be used; such switches fit into any s ...
... are suitable for use on low-powered motors only. Motors equipped with such contacts can be started and de-energized via any commercially available installation switch, provided they are of the single-speed type. For dual-speed motors a special rotary switch must be used; such switches fit into any s ...
AC motor
An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stationary stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings.Less commonly, linear AC motors operate on similar principles as rotating motors but have their stationary and moving parts arranged in a straight line configuration, producing linear motion instead of rotation.