We have a 30hp 1440rpm AC motor installed on a mixer.
Motor Pulley: 6"
Machine Pulley: 20"
According to my calculations, the mixer runs at 432rpm.
Operating Procedure: The mixer is loaded with approximately 200kg of raw material feed, along with water and several mixing compounds. The motor is then started by a "Star Delta" Starter.
Due to the high load in the mixer, the motor is unable to move in the "Star" Phase. The connected ammeter's needle touches the roof, so the current consumption is higher than 80amps (the max that the ammeter can measure).
When the Starter puts the motor in "Delta", it starts with a jerk and the ammeter reads about 60amps. After the initial 2-3 minutes, the mixer settles down and the motor's current consumption hovers between 30 and 40amps.
Considering that we install an AC Drive for the above motor, I have the following questions:
Would an AC Drive be able to maintain the necessary torque at extremely low motor RPMs?
I intend to have the AC drive slowly accelerate the mixer to the desired rpm, thereby giving the mixture enough time to settle down and reduce the need for high current consumption.
Would a V/F control type AC Drive suffice for the above application?
I am specifically looking at Siemens Sinamics V20.
What kind of energy savings would an AC Drive bring for the above application?
Other Details about Connected Power Supply:
I would greatly appreciate any and all assistance.
Please excuse me if any assumptions are wrong, I'm not well versed with this field.