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What is the torque speed characteristic?
the ratio of the relative speed of stator magnetic field with the speed of rotor, to the speed of rotor is defined as slip. where as in torque slip characteristic is the graph between the speed of the rotor and the torque experienced on the rotor. in the case of induction motor, the torque decreases with the increase in the rotors speed. while in the case of sychronous motor, its different (you check out, because i just forgot about it!! keep smiling!
Performance curve of a single phase induction motor?
The performance curve can be a graph of torque versus speed. The torque is zero at zero speed and also at the synchronous speed. Normally an induction motor operates at 90-97% of the synchronous speed, where the slip is between 10% and 3%. In this region the torque is proportional to the slip. As the torque is increased the speed falls until the motor stalls and the speed drops to zero. Below the stalling speed the torque rises between zero speed and the stalling speed. Because the torque is 0 at 0, a single-phase induction motor needs a separate starting winding fed by a starting capacitor to produce a little positive torque that starts the motor.
Why is the torque speed characteristics of a universal motor on ac source different from the torque speed characterisctic of the same motor on a dc source?
The torque-speed characteristics of a universal motor differ between AC and DC sources primarily due to the effects of reactance and phase differences in AC operation. When powered by AC, the inductance of the motor introduces additional impedance, which can lead to a reduction in torque at higher speeds due to increased reactance. In contrast, when powered by DC, the motor operates without these reactance effects, allowing for a more linear torque-speed curve with higher torque at lower speeds. Consequently, the performance characteristics shift significantly between the two power sources.
Why high starting torque is required for trains?
because train has heavy mass & due to heavy mass inertia is also very high so more effort is required getting motion in train. it is also known that any type of motor required more initial torque for come in speed.
What three factors determine the amount of torque produced by an AC induction motor?
Torque is produced by a phase difference between two windings. The higher the phase difference, the higher the torque.The rotor rotates slightly slower than the magnetic field produced by the stator (the fixed winding). The difference in speed is called the slip and it allows low-frequency currents to be induced in the rotor and torque to be produced. For a motor rotating just below the synchronous speed, the torque is proportional to the slip which is defined by this, where Nis the actual speed and Ns is the synchronous speed:s = 1 - N/Ns
What is the relationship between torque and speed for an electric motor?
Torque and speed are inversely proportional
What is the torque speed characteristic?
the ratio of the relative speed of stator magnetic field with the speed of rotor, to the speed of rotor is defined as slip. where as in torque slip characteristic is the graph between the speed of the rotor and the torque experienced on the rotor. in the case of induction motor, the torque decreases with the increase in the rotors speed. while in the case of sychronous motor, its different (you check out, because i just forgot about it!! keep smiling!
What is ment by the term torque multiplication?
Torque multiplication is proportional to the difference in speed between the impeller and the turbine. for example : At an engine speed of 2100 RPM, and torque at that speed of 100 Newton meters, the torque input to the transmission will be 2.2 times that value - 220 Newton meters with help of torque multiplication.
What kinds of trains are there?
speed trains and trains to transport people
What happens to speed when toque increases in bldc motor?
When torque increases in a BLDC motor, the speed decreases. This is because as more torque is applied, the motor has to work harder to maintain the same speed. The relationship between torque and speed is inversely proportional in BLDC motors.
Performance curve of a single phase induction motor?
The performance curve can be a graph of torque versus speed. The torque is zero at zero speed and also at the synchronous speed. Normally an induction motor operates at 90-97% of the synchronous speed, where the slip is between 10% and 3%. In this region the torque is proportional to the slip. As the torque is increased the speed falls until the motor stalls and the speed drops to zero. Below the stalling speed the torque rises between zero speed and the stalling speed. Because the torque is 0 at 0, a single-phase induction motor needs a separate starting winding fed by a starting capacitor to produce a little positive torque that starts the motor.
What are the differences Between Japanese Shinkansens and European High Speed Trains in terms of how the train is controlled?
The difference between Japanese Shinkansens and European High Speed Trains is that the European High Speed Trains make use of European EC Directive 96/48 while the Japanese Shinkansens use an ATC (Automatic Train Control) system.
What is relation between speed of generator and its voltage and torque on generator shaft and current produced by generator?
power = torque * rpm
What mechanism can increase torque speed?
One way to increase torque speed is by using a gearbox or gear reduction system. By changing the gear ratio between the input and output shafts, you can increase the speed of the output while reducing the torque. Additionally, increasing the voltage supplied to a motor can also increase its torque speed characteristics.
What is the relationship between torque and slip?
Torque in an induction motor is proportional to slip, which is the difference between the synchronous speed and the actual rotor speed. As slip increases, torque also increases, up to a certain point. This relationship is key to understanding the motor's operating characteristics.
What is difference between speed and torque?
Speed refers to how fast an object is rotating or moving, while torque is the force that causes an object to rotate around an axis. Speed is measured in units like revolutions per minute (RPM) or meters per second, while torque is measured in units like Newton-meters or foot-pounds. In a mechanical system, speed and torque are related through the equation power = torque x speed, where power represents the rate at which work is done.
What is the torque on a torque converter?
Torque output of the engine at that speed.
