0
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!!
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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 rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Drawing of speed-torque curve for synchronous machine?
Theoritical torque speed curve for a synchronous machine will be a vertical line located vertical to the synchrounous speed at x axis, from starting torque to stalling torque value. This is because theoritically synchronous motors are not self starting. Practically however they start as induction motors and at near synchrounous speed the excitation is switched on. Anand Sekhar
What is the importance electric motor?
The main reason is the motor’s variable speed behaviour. When the voltage applied to the armature of a DC motor increases, themotor’s speed increases correspondingly.Another reason is the DC motor can develop full torque from zero up to its base speed. This constant-torque characteristic allows DCmotors to be used on applications such as conveyor belts, elevators, cranes,extrudesand mixers,amongstothers. The full torquefrom zero speed is useful when the application needs to be stopped when fully loaded, and then got moving again
How do Torque is related with speed?
Torque is a measure of how much a force acting on an object causes that object to rotate. Speed is how fast something is going. Another way to think of this is as how far you can go in a certain amount of time.
What is the torque on a torque converter?
Torque output of the engine at that speed.
What is the relationship between torque and speed for an electric motor?
Torque and speed are inversely proportional
Explain Speed mode torque mode in variable speed drives in detail?
Torque mode in variable speed drives is where the drive adjusts its torque according to the input. The speed/velocity mode is where the input is used to control the motor's RPM.
Do pulleys increase torque or speed?
Pulleys can be used to increase torque or speed, depending on how they are configured. When the pulley with a larger diameter is driving a pulley with a smaller diameter, torque is increased while speed is reduced. Conversely, when a small pulley is driving a larger pulley, speed is increased while torque is reduced.
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.
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 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.
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 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 are the uses of a gear train?
Either to increase speed and reduce torque or to decrease speed and increase torque while conserving mechanical energy.
Why rotor contactor in external resistance of slipring motor connected in delta?
rotor contactor are used to cut the resistance in slip-ring motor connected through resistance box. resistance is proportional to torque. so by controlling rotor contactor resistance can be controlled and hence torque can be controlled. for more information check torque and speed characteristic of wound motor.
Full load torque of induction motor?
The full load torque of an induction motor is the maximum torque it can produce at its rated speed when operating at full load conditions. This torque is necessary to drive the load at the desired speed under normal operating conditions. It is an important parameter to consider when selecting a motor for a specific application.
