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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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Wiki User
∙ 12y ago
Wiki User
∙ 11y agoPower = torque * speed
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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
What is difference between speed and torque?
speed= distance per seconds & torque= revolution per seconds
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.
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.
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.
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.
What mechanism can increase torque speed?
the motor
Full load torque of induction motor?
full load torque is the torque which produces rated power at full speed
What happens if load torque is same at full speed in separately excited dc motor?
Same as what? at maximum speed and torque, the motor delivers maximum power.
What is mean by back up torque and when it applies?
Torque backup is generally applicable to low speed diesel engines which are primarily used for high torque applications like tractors and off highway vehicles. Generally torque backup is expressed in percentage Torque backup = (max Torque - rated speed torque)/rated speed torque in % This generally means how much the engine can be loaded when its rpm drops to max torque rpm. Usually all OEM try to give maximum backup torque from their engines. But it is limited by volumetric efficiency at lower rpm for NA engines and for TC engines it can be more.
