Hello friends,
This is a generic discussion regarding operating region of Induction Motor(IM) used in hoist. For the sake of convention, if I suppose when IM is lifting a load up then it runs in a first quad of Torque/Speed with ABC phase sequence absorbing power from the system. Speed close to rated speed, assuming clockwise rotation.
Now, when IM is lowering the same load with ACB phase sequence, at first instance it appears that due to gravity and rotation of motor the speed in counter clockwise direction shall become very high. But it is not so. My doubt is "Is the motor operating in other quad of Torque/Speed? Speed is found to be the same.
For same speed in either directions I am not able to explain this phenomenon?
Can anyone throw light upon this subject?
This is a generic discussion regarding operating region of Induction Motor(IM) used in hoist. For the sake of convention, if I suppose when IM is lifting a load up then it runs in a first quad of Torque/Speed with ABC phase sequence absorbing power from the system. Speed close to rated speed, assuming clockwise rotation.
Now, when IM is lowering the same load with ACB phase sequence, at first instance it appears that due to gravity and rotation of motor the speed in counter clockwise direction shall become very high. But it is not so. My doubt is "Is the motor operating in other quad of Torque/Speed? Speed is found to be the same.
For same speed in either directions I am not able to explain this phenomenon?
Can anyone throw light upon this subject?