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Does the speed of induct motor increase or increase when the motor load increase?
Wiki User
∙ 13y ago
Decreases.
Wiki User
∙ 13y ago
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What happens to the rotor speed and rotor current when the mechanical load on an induction motor increase?
whenever the load increases,the current drawn by the motor to do or to fulfill the required energy to the load. so the current will increase generally.Increase in load will cause the full utilization of motor,so speed of rotor will decrease.
How do you reduce the speed of a 15 kW 3 phase motor without using variable speed control?
If the load is connected to the motor via belts, you can change the speed the load is turning by changing the pulley sizes. To get the load to slow down, increase the size of the pulley on the load; to get it to speed up, increase the size of the pulley on the motor. To reduce the speed of the motor itself, you'll have to alter the line frequency, which you can't do without a variable frequency drive attached to the motor.
Why induction motor current increase when load increase?
The slip is proportional to the load torque in an induction motor. This can also be seen as a reduction in speed causing extra current to be induced in the rotor to supply the increased torque.
How do you control speed of a motor?
first do you reduce the voltage level or increase the load factor
What is the speed of DC series motor at no load?
No load speed is the speed that the motor run when it has no load, i.e., the motor is separated from the engine, that speed is than greater than the rated speed, because the rated speed is the speed whwn the motor are linked to the load and it is the full load.
How can pulleys be used to increase the speed of a motor?
I dont think you can increase the speed of the motor but if the motor is driving some piece of rotating equipment (pump etc) the speed of the driven shaft can be increased up to the point where the motor reaches full load current.
Why is motor current draw lower at full speed?
Because full speed is unloaded. As you load the motor, speed decreases, and slip increases, with an accompanying increase in current.
Can you increase the rpm of a drive motor once it drop due to added load using variable speed drive controller?
The motor is slowing down due to the load. DC Speed controllers can only slow down motors, not increase the speed/power. 3 phase AC motors are slightly different, in that the speed is controlled by a VFD (Variable Frequency Drive), which can increase or decrease the speed of a motor, provided the motor is large enough to handle the load initially. If the motor is slowing down after a load is applied, and does not regain running speed after the load has "spun up", a more powerful motor is required. Read motor data sheet for running speed. If the motor is hot while running a load, it is more than likely overloaded or at the load limit. Motors with at least 10% to 25% extra power over bare minimum should be used to make up for loss of efficiency, bearing issues, etc. over time.
Why the series motor is started with some minimum load?
In series motor, At no Load Condition the flow of Armature Current is low, then the Flux is also low. Flux is inversely proportional to speed. If flux is decrease the speed is rapidly increase it spoil the rotor parts...... so SERIES MOTOR is start with LOAD.....
What happen to the rotor speed and rotor current when the mechanical load on an induction motor increases?
rotor speed will decrease....the rotor current wil increase.....
What happens to the rotor speed and rotor current when the mechanical load on an induction motor increases?
rotor speed will decrease....the rotor current wil increase.....
Why dc series motor cannot be start without any load?
If a DC series motor is started without load, the armature winding (winding that doesn't spin) current will be at a minimum, resulting in the motor going to maximum speed / runaway, which can cause things to fly apart. As Armature current increases, the speed of the motor will decrease. The armature current will be forced to increase / speed of the motor will be forced to decrease as more and more load is applied.
