What kind of Electric Motor do I need?

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SUMMARY

The discussion focuses on selecting an appropriate electric motor for a mobile trolley application requiring a 2HP DC motor with 400 Nm torque, operating at 12V/24V and 120 A. Participants recommend using a Permanent Magnet DC (PMDC) motor due to its suitability for the specified power and torque requirements. The conversation also addresses whether to use a single motor for both drive wheels or two separate motors, concluding that a single motor setup would necessitate a differential, while two motors would allow for independent wheel speed control during turns.

PREREQUISITES
  • Understanding of DC motor specifications, including power, torque, and voltage.
  • Knowledge of gear reduction systems, specifically worm drive arrangements.
  • Familiarity with PMDC motors and their applications.
  • Basic principles of vehicle dynamics, particularly regarding steering and wheel control.
NEXT STEPS
  • Research PMDC motor specifications and applications in mobile robotics.
  • Explore gear reduction systems and their impact on torque and speed.
  • Investigate the design and functionality of differentials in motor setups.
  • Study the dynamics of steering mechanisms in wheeled vehicles.
USEFUL FOR

Engineers, hobbyists, and designers involved in robotics, mobile trolley construction, or electric vehicle design who need to select appropriate motors for specific applications.

namith11
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I am looking for a DC Motor with the given specifications:

Power: 2HP
Torque: 400 Nm
Voltage: 12V/24V
Current: 120 A
Number of Drive Wheels: 2
Diameter of drive wheels: .435m

Gear Reduction set up: Worm drive arrangement
Total weight being driven: 650kgs
Speed at motor: 1500rpm
Speed at wheels: 50rpm
Gear reduction ratio: 25:1

The motor will run the two driving wheels of a mobile trolley in which basic forward backward motion is required with on/off action. i want to know if i should go with a pmdc(Permanent Magnet) motor or a Servo Motor any why. Also, does it make more sense to have one motor that runs both wheels or should i use two separate motors to run the wheels separately.
Thanks!
 
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Wow ... that is some weird motor (but then I don't have any experience with very high current DC motors). Have you even found any with that kind of spec (24V, 120amp) ?
 
Have you done a search on globalspec.com?
 
A automotive starter will come close to what you want. Keep in mind they are built for intermittent duty.

AceEngineer
 
An automotive off-road recovery winch motor might also fit the bill.
 
Hey,
I found a 12V, 120A motor. But I am trying to figure out if i should go with one motor to run both wheels or two motors(to run each wheel separately). Will I need a differential in both cases or only with the one motor setup? Cause steering will be done manually so I am worried that it will need enormous amounts of force to turn it round corners.
Also, I think i am going to go with the PMDC Motor cause it makes more sense.
 
Hey,
I found a 12V, 120A motor. But I am trying to figure out if i should go with one motor to run both wheels or two motors(to run each wheel separately). Will I need a differential in both cases or only with the one motor setup? Cause steering will be done manually so I am worried that it will need enormous amounts of force to turn it round corners.
Also, I think i am going to go with the PMDC Motor cause it makes more sense.
 
With a single motor you would need a differential, with two motors you would need to make sure the wheels could turn at different speeds while turning, which I think would be possible by simply limiting torque to the "inside" wheel while turning.
 

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