What kind of Electric Motor do I need?

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Discussion Overview

The discussion revolves around selecting an appropriate electric motor for a mobile trolley application, focusing on specifications such as power, torque, voltage, and current. Participants explore the suitability of different motor types, including Permanent Magnet DC (PMDC) motors and servo motors, as well as considerations for using one motor versus two for driving the wheels.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant specifies the motor requirements, including power, torque, and gear reduction setup, and seeks advice on motor type and configuration.
  • Another participant questions the availability of a motor that meets the specified high current and voltage requirements.
  • A suggestion is made that an automotive starter motor might be suitable, noting its design for intermittent duty.
  • Another participant proposes that an automotive off-road recovery winch motor could also be a viable option.
  • One participant expresses uncertainty about whether to use one motor for both wheels or two separate motors, raising concerns about steering and the need for a differential.
  • Another participant suggests that a single motor would require a differential, while two motors would need to allow for different wheel speeds during turns, proposing a method to limit torque on the inside wheel.

Areas of Agreement / Disagreement

Participants express differing opinions on the best motor configuration and type, with no consensus reached on whether to use one motor or two, or which motor type is superior.

Contextual Notes

Participants discuss the implications of steering mechanics and the need for different motor setups without resolving the technical details of differential requirements or the exact specifications of suitable motors.

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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