Questions tagged [motors]

Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.

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Looking for a linear actuator that can carry a transverse load? Does such a product exist?

I am looking for a product that works like a linear actuator where you can control how far it extends but it can also hold a transverse load at the furthest point of extension. What I am looking for ...
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Wear and tear on motors - soft start, also wear impact of sudden power loss?

I understand that starting and stopping electric motors puts a lot of strain on them compared to running them continuously. I suspect that a lot of this strain is due to the sudden inrush of current ...
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Why does an electric motor, of 800 kW at 400 V, have 7 connectors for power cables?

I found a Vybo electric motor and noticed that it has seven connectors for power cables. I also found a Variable Speed Drive, Altivar Process ATV900, System ATV960, 800/630 kW, 400 V and its datasheet ...
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Can an electric motor act as a load for the electric generator rotated by that motor?

I have an experimental generator and an off-the-shelf motor that I intend to arrange like in Fig. 1. The problem is that if I connect the required load to the output of the generator the power drawn ...
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RS-550 motor only spinning in short bursts

I bought four of these motors, brand new and they all have the same issue. Amazon RS-550 I am a bit confused by the Horsepower: 100 watts claim. The motors require 12V from various specifications I ...
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Brushless rotor - identify black shroud

I'm a hobbyist learning about motors. To this end I've salvaged this brushless motor from scrap. It has 4 magnets to its rotor, but they are encased in some black material. Can anyone help me identify ...
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Electromagnetism - DC Motor Design Question - EMF/BACK EMF

I'm not gonna lie - I don't have enough knowledge about EMF and Back EMF so I need you guys , my friend will soon build a DC motor for me but I currently have no idea what design will produce high ...
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What's the best way to attach 1 motor to 2 separate wheels on an electric skateboard?

I am in the process of building an electric skateboard. I have all the electronics working and now it's time to put together my skateboard. The problem I am having is that I only have 1 motor and ...
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Cam for linear actuator from a DC motor

I have a DC motor with known characteristics like torque, speed, etc... The actuator (in green) is like a piston and I know it must be operated as follow: with a force > 60 N the full stroke is 5 ...
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Constant-force actuator for a lifting plate

Thank you for this forum. I am writing here because I struggle with a mechanics problem. I am designing a lifting device for heavy charges. The load (F) is applied to a top plate. I would like this ...
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How do I match a VFD to an AC motor?

I have a 1 HP, 4-pole, 3-phase, AC motor which is inverter rated. I need to select a Single Phase VFD to drive the motor. Some of my options are as follows: 1 HP, 120V, 3.7 amp 1 HP, 240V, 3.7 amp 1....
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"No Load Speed" for Series DC Motor - What does it mean?

The datasheet for the Maxon 110121 series-wound DC motor lists both "No Load Speed" and "No Load Current" as data points, and I do not understand what it is trying to communicate ...
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Understanding the units of columns in MaFaulDa Dataset

Recently I am learning about the MaFaulDa machine failure database. I am wondering about the unit of column zero (tachometer signal) measured by Monarch Instrument MT-190 (as announced by database ...
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Connecting a brushed direct drive motor to a wheel with no holes in the hub

I am building a 4 wheel drive rover robot. I was very lucky to find four good condition wheel chair motors on the side of the road. I had to disassemble the wheel chairs of course but well worth the ...
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Torque Problems vs Motor Problem?

I want to preface this by saying I am software engineer so each part of this robot build has been a lesson on its own. From welding, to CAD design, pillow block bearings, etc, etc.... I am working ...
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How to slow down an electric motor for pull cart?

I'm trying to retrofit an electric motor (such as this) to a pull cart as depicted below. I got most things figured out except for how to slow down the motor to a pedestrian speed. Could I slow it ...
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Will the cart steer to the left/right by itself in this design?

I'm trying to retrofit a pull cart with electric motor. So, one wheel will have an electric hub motor and it is connected to a rotating shaft to the other non-powered wheel. The driveshaft is ...
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In a AWD Tesla Model 3, why is the front and back motor different?

In a AWD Tesla Model 3, why is the front motor (OEM 1120960-00-E) different from the one in the back (OEM 1120980)? Why not just use the same one for both front and back? I'm sure that there was a ...
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What's the minimum torque needed for 2 DC motors for moving a 1 kg object on top of them?

I have a weight of 1 kg and I want to properly choose 2 DC motors for them in order to be able to move the 1 kg of weight with variable speeds in the range of 0 to 1 m/s with an increment of 0.05 m/s. ...
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Torque calculation for DIY friction wheel drive electric unicycle

I’m building a friction wheel drive electric Unicycle. Something like this; My question is how much torque should the friction wheel drive motor have considering the total mass of unicycle including ...
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How does vibration monitoring with engine power differ?

How do engineers design vibration monitoring for motors with different wattage? What effect does power have on vibration? I consulted manufacturers of these vibration monitoring and did not see any ...
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Torque on motor shaft when shaft is rotated manually

The motor shaft is connected to a flywheel which is rotated manually to achieve a certain speed. Now when motor is switched on, how will it impact the shaft? Will motor whole power goes into ...
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Can a hydraulic vane motor have a specific rotational output?

If a vane motor/pump was used in a hydraulic circuit, could the rotation of the vane pump be controlled for slight movement in angles? I imagine this would would require a feedback controller, with ...
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Retrofitting an old compressor with VFD

For an AC unit, the compressor - GK151PAB - Hermetic type, Permanent split condenser,2 pole, Single phase, Induction motor. This much I know about it. What else do I need to know and how do I find out ...
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Estimating yaw torque and power of HAWTs

I am trying to estimate the amount of torque and power required to rotate a 3 bladed Horizontal Axis Wind Turbine (HAWT) about a vertical axis("yaw" motion). I would like to estimate the ...
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Can I drive a pulley with two shaded pole motors using one motor at a time with different size pulleys for speed control?

Using two same RPM shaded pole motors, one with a one inch diameter motor and one with a two inch diameter. Using a DTDP switch to swap power from one pulley to the other. For a two speed rotation ...
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How to control speed of DC Gearmotor with Varying Torque

I have a system where the torque is constantly changing, but I need the speed to remain at 9RPM. I have enough room for error where I can be between 8 and 10RPM. How can I achieve this? All I can find ...
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Simplest way to maintain speed of motor? Type of motor for application, speed control required, power supply, etc

I am currently designing a mechanism that will do something like this. The rotating disk will be connected to a motor via shaft coupling. I am going to have a cylinder going through the bore in the ...
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Will the torque applied to a circular object be the same if the object isn't aligned in the center of the Torque?

I'm a student designing a system to automatically turn a steering wheel. In this design the motor will be in the center of the steering wheel and it will apply it's torque on the steering wheel ...
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I'm trying to understand an equation from a motor simulation $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$

I have a simulated motor and I'm not understanding the math to control it. This is the equation for the force of the motor, also called an 'actuator'. $\dot w_i (u_ i ​ ,w_i,l _i ​ , \dot l _ i ​ )$ w ...
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How to select the right power supply for a stepper motor?

When choosing a power supply for a stepper motor, e.g. this one below: Amazon Link NEMA 23 This one has: Rated Current: 4.0A Operating Voltage: 24-50VDC The Stepper Driver I will be using is: Stepper ...
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Digital servo for my robot arm?

I'm planning on using this servo for my robotic arm project: Amazon link. It's a digital servo with 35 kg-cm (3.4 Nm) torque. However, when looking at other robotic arm projects, I've mainly seen ...
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Could I have help on understanding stepper motor speed?

I'm confused about stepper motor speed. On their data sheet it doesn't really specify a maximum speed. I want to use a stepper motor with a 3:1 gear ratio. This is the motor that I am looking at: ...
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How would I calculate the torque of the motor shown in the diagram?

Torque due to force of gravity: -Payload: 0.2kg x 0.3m x 9.81 = 0.5886 -Hand: 0.1kg x 0.25m x 9.81 = 0.24525 -Forearm: 0.3kg x 0.1m x 9.81 = 0.2943 Torque due to force of gravity = 1.13Nm What about ...
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Is ther any way I can attach this servo attachment to a normal DC motor?

I would like to use a small dc motor as a winch for a hobby project. I found a budget winch attachment on Aliexpress but it only attaches to hobby servo motors. A servo motor has a 25t (teeth) 6mm ...
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How to pick a motor that won't stutter/vibrate?

I built a system that has 4 rods with a block attached at the end that rotates in a circle and stops every 1/4 revolution of a cycle. It then starts back up after a certain amount of time. What I ...
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Advice needed to source a compact, quiet and powerful brushless motor for a lathe

I am designing a small metal lathe for home use, and I am having trouble sourcing a motor for it. Disclaimer: I am aware that such lathes are available for purchase, and anything home-built will be ...
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Can you calculate torque without any pulleys involved, and if so, how?

I'm trying to calculate the type of motor I need to turn something of a certain weight, so I feel the thing I'm trying to calculate is torque, but, when I research how to find torque, I find this &...
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Motor that plugs directly into wall outlet

I am looking to drive a disk at relatively low speeds (9rpm) and somewhat high torque (not sure on exact numbers, 100+ in-lb.) I am looking for a motor that can plug directly into the wall and just ...
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Understanding small DC motor curves (torque, efficiency etc)

I have a small DC motor/gearbox unit and the spec sheets is shown below. All* the units are measured at the gear box output, so 100 RPM would be 3,000 at the motor. I'm using it as a generator so am ...
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Determining if a known DC motor is powerful to accelerate and rotate a known mass

This question has been asked a fair amount, but I can't quite seem to 100% figure it out. I'm trying to figure out if a known motor is powerful to rotate a known mass (or approximated) at a given ...
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Why aren't pneumatic/hydraulic artificial muscle actuated humanoid robots more common?

I'm designing a humanoid robot using pneumatic artificial muscles. I chose these actuator units because they're much cheaper than electric motors of comparable power output capability. instead of ...
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System identification of a simple motor with only position measurements

(Cross-posting from statistics stackexchange) Say we have a permanent-magnet DC motor that roughly obeys the system equation $$\ddot{x}(t) = \alpha \dot{x}(t) + \beta u(t) + \gamma $$ where $x(t)$ is ...
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Help with design of linear actuator

I am working on an automated gate positioner for a drill press. This gate will move back and forth by a set distance so lining up the drill press is automatic. I have tested with the Z axis of a cheap ...
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Predicting thrust of a Motor

I want to be able to predict the load a single motor and propeller can carry, so I can choose an appropriately sized propeller and powerful enough motor. I say predict because I'm first going to ...
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How to maximize strength/torque of a joint?

I'm an elec engineering student and so mechanics isn't my best field, apologies if the question is straightforward. If i have a robotic joint (e.g elbow or knee). What are the best methods for ...
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Damage to drill through torque?

I've got a Bosch PSB 50 drill, which I'm using to drill through some apparently really tough wood. I don't know why, The drill seems to be struggling, and at times comes to a complete stop. I'm not ...
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Calculating Motor Torque needed for a belt driven linear motion mechanism?

I am working on a belt-driven linear motion mechanism using drawer slides (I've attached a small video that shows the Mechanism for my First Tech Challenge Team. I was now wondering how much torque ...
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How do 3 different gen kVA ratings Service Load (maximum), Service Load (continuous), and "Motor Starting kVA (Max.) relate to the nameplate value

I'm reading an engine generator parameter schedule that has three different kVA values listed. The standby generators have "Service Load (maximum)", "Service Load (continuous)", ...
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Motor to rotate gear and hold place when powered down

I have an application where I need to rotate a solar panel on a moving cart around 2 axes. The solar panel is medium size (22x25in) and is only 50 watts. I plan to use an actuator to rotate the ...
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