@Shahul Ideally your main battery should be able to supply a lot more current than what will be consumed under normal use. Surge protection will help, but it’s not an ideal solution. LiPo is common for EVs, but be sure to have a complete, rigid enclosure which is well ventilated. Since it sounds like you’re building an actual car (or similar), it’s good to be in touch with the manufacturers of the batteries and the motor controller to get their input. They are often ready to help and give advice.
Sir, motor speed 2900 And Fan Speed 2450 if Which type of VFD I selected please tell me.And which parameters based I select the VFD.
@Anusha You’re looking at variable frequency drives? These are normally for AC (not used much in hobby robotics). https://en.wikipedia.org/wiki/Variable-frequency_drive
sir, i am making a sumo robot of 1 kg for a robotics competition. I just want to know i f i want to push the opponent robot then the dc geared motor of which rpm should i have to use ? And also can u explain the relationship between rpm of the motor and the power drawn by it?
@farzeen There are many factors to sumo robots, of which one is rpm, the other torque, another are the sensors used and then the code. The overall shape will have an impact as well. You would likely use a DC motor, encoder and motor controller. At lower speeds, the motor tends not to be able to provide as much torque as compared to when it’s operating at its rated / max rpm. Some motor manufacturers provide a curve of torque vs. rpm, as well as torque vs current, but unfortunately most do not.
Hello, my name is David, I’m an artist whom tattoos in leather. I have some questions and I hope that you can and will help me, even though these are not relevant with robots, but I don’t know where else to ask them. I’m tweaking a tattoo machine. Motor width: max 24mm. Lenght approx: 32mm (ex shaft/axle)
Q1: If a machine works 8000 rpm @ 12volts, it would be +/- 4000 rpm @ 6volts. But the needle hits softer with less rpm, I think. If the wattage of the motor was higher, say: 10 watt instead of 3W. would the needle hit harder on 4000 rpm @ 6volts?
Q2: Or should I change the voltage on the motor? Use a 6volts, 9volts or a 18 volts motor? Which would give a harder hit/bigger torque at 4000rpm?
Q3: Which motor would you recommend? Well I hope you can help in my quest and hope to hear from you soon. With kind regards,
David.
@David Pents We’d be happy to help, but since this might involve some back and forth - can you create a new topic on the RobotShop Forum? Thanks. We have truncated your post here.
Sir…Im going to design a stair climbing robot using rocker bogie mechanism with 6 wheels.Im also going to use 12v dc geared motor with 30rpm for each wheels.
I want to know is it enough to carry a load of 5kg for 6 motors in steps without problem.
@ponraj The motor’s torque as well as the grip of the wheels on the stair, and the dimensions of the rocker-bogie will play the most important roles. RPM and voltage are secondary. For each step, the rear four wheels will push the front two against the stair, adding to the friction. If you really want to know if it will support 5Kg, you have quite a few equations and calculations to go through.
I have a Old Servo Motor with serial port and feedback connector, can you please help me how to use the motor, I need a high speed motor with good power, can i use this motor.
@Ramu Create a new post on the RobotShop Forum with as many details and images as you can. We’d need to know the brand, model, connector etc.
I’m trying to design a linear motion actuator which will have 10 kg pulley attached to it…this pulley needs to be moving front and back at variable speeds… I’m trying to use 12v DC motor…how to select a proper motor with given requirements…I’m novice in this…this is my first project and ur help would be much useful
@Vignesh R Would need to see a sketch or drawing explaining the motion. Can you create a new post on the RobotShop Forum and provide as many details as possible?
Very Informative post. Thanks for sharing.
I have a DC motor from an elegoo set, I don’t know the nominal voltage however the entire set ran off of 2 3.7v 2200mAh batteries, because this is just one motor could I get away with using only one battery?
@Dashiell, There is no good answer to this question since we do not have enough information from your original setup. Are those batteries in Series or Parallel ? If you have two cells in parallel you will get 3.7V but in series it will be 7.4V.
hi i am trying to figure out what size of dc motor most likely 24v that would produce atleast 18050 #ft torque that could be coupled to a 18 speed gear reducer to be able to move 30 tons
@john pierced If you really want DC, you’ll need to know the diameter of the winch drum to use T=FR. 30 tons = 60k pounds, so if you choose a 4" diameter drum (1/3 foot), the motor would need 60k1/3 = 20k pound feet of torque. We do not offer anything in that range - you might want to look at existing winch systems for trucks and adapt it to your needs.
Dear Coleman, First of all thank you for such a crisp description of motor specs.
Quick question: Is there a place you can point me to for control engineering specifications of a typical automotive motor (for example a windshield wiper motor).
I wanted to model a motor and wanted to know what values are typical of the armature resistance, armature inductance, damping factor, and spring constant are.
Or would you be kind to list these for a typical small motor?
Once again thanks for your help
@Rajesh S Excellent question; we too have had to look for these values for designs and they are incredibly difficult to find, largely because these motors are rarely ever obtained directly from the manufacturer; they have been mass produced for the specs of a certain application, then re-sold by others. It’s also rare that for inexpensive motors, even the manufacturer or the customer needed these details (ex Mitsumi). Higher quality manufacturers like Maxon and Faulhaber have full specs, but the price of their motors is many times that of inexpensive hobby grade motors, and the numbers are likely not representative, even at the same torque, power etc. Some of these values can be obtained experimentally (multimeter and power supply and graph data). Unfortunately we don’t have any easy answer for you other than spending a few dollars on some inexpensive motors and obtaining values via experimentation, or trying to contact the manufacturer directly. If you’re using Matlab or Labview, there may be motor examples with some details.