Why does the power consumption of a plucker machine vary with rotational speed?

Click For Summary
SUMMARY

The power consumption of a plucker machine inversely correlates with the rotational speed of its plate. At low rotational speeds, the power consumption rate is high due to the motor operating under high slip conditions, resulting in high current draw. Conversely, at high speeds, the load is reduced as the contents adhere to the drum, leading to lower power consumption. This phenomenon is influenced by the characteristics of the motor, likely a NEMA type D motor, and the efficiency of the plucking process, which improves with increased speed.

PREREQUISITES
  • Understanding of motor types, specifically NEMA type D motors
  • Familiarity with speed-torque curves and their implications on motor performance
  • Knowledge of power factor (PF) and its impact on power consumption measurements
  • Basic principles of load dynamics in mechanical systems
NEXT STEPS
  • Research NEMA type D motor specifications and applications
  • Study speed-torque curves to understand motor performance at various loads
  • Learn about power factor correction techniques in motor applications
  • Investigate methods for measuring power consumption accurately in motor-driven systems
USEFUL FOR

Engineers, mechanical designers, and technicians involved in the design and optimization of motor-driven machinery, particularly those focused on efficiency and power consumption in agricultural equipment.

Henry Rufin
Messages
1
Reaction score
0
hi, i have a study on a plucker machine and it came out that when the rotational speed of the plate is low, the power consumption rate is high and if the rotational speed is high, the pcr is low.

what is the possible explanation for that? thanks in advace.
 
Engineering news on Phys.org
The speed is controlled by a brake, not by changing the voltage (or frequency) to the motor.
 
Could be the nature of the load. For example consider a horizontal axis drum .. at low speeds the contents are lifted and fall down but at high speed they stick to the drum and rotate with it.
 
Could they be referring to efficiency (chickens plucked per watt-hour increases with speed) versus absolute power consumption at each speed?
 
Henry Rufin said:
what is the possible explanation for that?
I think Tom.G hit it, load determines speed.

Might be driven by a NEMA type D motor.
Look at its speed-torque curve. At high speed it's unloaded.

http://industrialelectricalco.com/wp-content/uploads/2014/01/nema-abcde-torque-curves.pdf
upload_2017-5-19_5-15-37.png
 
"I have a study" - -what study, what type of motor? At low speed - a standard induction motor has high slip, high current, lower power. However in an application at low speed the motor will use all of the torque available to try to accelerate - at full speed, it is probably not fully loaded, but then it has bad PF. If YOU did the study - how did you measure power? -- If only V x A and did not include PF... ( Motor curves are like a current ratings - typically "what is available", in an application you are not ON the motor curve - you are somewhere "below" it)

Side note - I did a job in Trinidad and they had "Cluck and Pluck" stores - like a laundromat. You bring in your chickens and cluck and pluck them. As a east cost USA guy, it was the weirdest thing I have ever seen.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
5K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
8
Views
3K
  • · Replies 25 ·
Replies
25
Views
3K
  • · Replies 8 ·
Replies
8
Views
3K
Replies
26
Views
8K
Replies
11
Views
2K
  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 7 ·
Replies
7
Views
3K