# Questions tagged [motors]

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

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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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### 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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1 vote
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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 ...
84 views

### 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 ...
100 views

### 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 ...
1 vote
64 views

### 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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1 vote
495 views

### 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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### Torque Required From Motor For a Project

The device I am building is responsible for supporting 200 lbs and is required to accelerate 10 feet per second. The device will have two 8 inch diameter wheels. I have worked out what I believe to be ...
58 views

### Is the torque adequate?

I have a 10 pound flywheel attached to a 200w motor that has a torque rating of 280Nm that can achieve a 12000 rpm. The gear ratio to the inner axial of the flywheel is roughly 1:1 which is 48mm in ...
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### How to find the torque required to rotate wooden slab

How can I find the Torque needed to rotate a wooden slab with no weight applied on either end of the slab if I have a servo motor placed at the middle of the slab?
2k views

### How turbo engines increase efficiency if have lower compression ratio than naturally aspirated engines?

I know that efficiency depends on compression ratio(CR), NA engines always has higher CR than turbos,so how turbo engine can have better efficiency?
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### Required Motor Torque [duplicate]

I am interested in constructing an robot which will be responsible for supporting a 200 pound load. There will be four wheels and the diameter of the wheels are 8 inches. The robot will be required to ...
149 views

### How to make motor spin the other way

Let’s say I want two motors in parallel in a circuit (so they get the same Voltage), and wanted one motor to spin anti-clockwise and the other clockwise- is it possible? I thought by flipping one of ...
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1 vote
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### BLDC motor electrical constant in Vms/krpm?

At this random motor shop and elsewhere (in the results of STMicroelectronics' motor profiler), I find a Ke constant expressed in Vms/krpm. If this were Vrms/krpm, I would guess that "rms" ...
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### A regenerative braking system, what am I doing wrong?

I am currently working on a system of regen braking using two DC motors one of them is driven by the motor controller and the other one is using the main motor to spin in cases of full load and in ...
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### Controlling Motor Rotation

This is my first question / post here. I have just begun researching motors and how they work, as they are necessary for a personal project. I want to know how to control a motor so that it only ...
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### Why are there grooves on this bearing?

I tore apart a Corsair PC Case Fan, and after stripping away plastic, I found this bearing inside. It has swirly grooves. What are these swirly grooves for? My guess is it has something to do with ...
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### Motor driver only works on one side

I have three motor drivers and all three other them only seem to only work on one of the two sides. I have used a voltmeter to check the voltages across the each of the two sections on each motor ...
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### Motor For powered adult swing

I'm trying to design a powered swing for adults (similar to a baby swing, but scaled up). Am I right in assuming that this is functionally a pendulum and the power required is (0.5)mgsin(t)? How ...
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### How can you make a solid box jump up with no external forces?

Let's say I have a box lying on a flat surface. Inside the box, I make a heavy mass hang from a spring attached to the top of the box. If we pull the mass all the way down and let it go, I believe it ...
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### Motor Power for vertical lift in linear slide mechanism

I want to pull up and down 10 kg metal cylinder at 7 inch vertically by using linear slide mechanism in 1 second. What should be the motor rpm, gear type, torque, watt etc? Otherwise how to calculate ...
• 101
1k views

### Is electric motor torque determined by Kv or by power (watts)

I'm trying to size a motor for an e-bike, but I'm confused as to what motor parameters determine the maximum torque that it can output (Kv or power in watts); I've found the following formulas: Power (...
57 views

### How to size a motor for a balanced lever?

I'm new to mechanical engineering. I have a 5m long lever with a fulcrum positioned 1m from one end. The whole setup is balanced and I need to calculate the torque of a motor that would move the lever ...
129 views

### How does Kia charge the high-voltage battery in EV mode?

I recently bought a Kia Ceed 2020 PHEV (Plug-in Hybrid Electric Vehicle). Its specs mention a 6-gear Dual-Clutch Transmission (DCT), a 105 kW Internal Combustion Engine (ICE) and a 44 kW Motor-...
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### Does a 6 channel motor driver exist?

I have just ordered a giant robot chassis on the internet that consists of 6 motors: https://shop.pimoroni.com/products/dagu-wild-thumper-6wd-all-terrain-chassis The only issue is that I am unable to ...
64 views

### Kollmorgen TBM frameless motor material

I am an undergraduate student in electromagnetics. I am analyzing and researching Kollmorgen TBMS series motors. What I am curious about is why its motors are wrapped with a "shell" around ...
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1 vote
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### DC motor as generator - some questions

I have been doing some experiments using a small brushed permanent magnet DC motor as a generator. I have it coupled to a similar (as in, exactly the same) motor which is powered by a PSU. thus ...
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1 vote
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### Help finding motor to replace awning motor (want to jerry rig something together)

The motor on my awning just bit the dust (again). This is the second time this has happened. I'm looking to replace it with something that I can build myself, using the existing motor enclosure. You ...
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### How can I map a global spherical position of a central normal vector to the rotation of 2 perpendicular motors?

I have a machine that rotates two concentric frames. The outer frame has a motor that rotates it relative to the global y-axis, and the inner frame has a motor that rotates it about the outer frame's ...
79 views

### How to evaluate motor rating?

I am trying to determine what type of motor to buy that can spin my load at high speeds without overloading it, but really, evaluating this is not my forte. I know this is not sufficient information ...
881 views

### How do I start looking for a cheap encoder?

For my project, I need a rotary encoder. The first requirement for it is to be cheap, and I am not sure how to even start looking for them. The RLS magnetic encoders seem cool, but they are a bit more ...
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### How this synchronous motor works and how to modify them?

I have the following synchronous motor ripped out from an old range hood in my kitchen. I used new electrician tape to cover up the coils that should form the electromagnet--the old cover is too oily....
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### Selecting motors to lift 3 kg

I need a little guidance to select a motor for a lifting mechanism for a weight of 3 kg. I am going to use two motors and both motors will have a gear (attached to the shaft) very close to each other ...
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### Calculation for Motor Selection

I need help with the selection of a motor and a motor driver I need to spin a 700g (65mm radius) round ball at 35,000 RPM. I need to bring it up to speed slowly, so I also need a motor driver/speed ...
103 views

### Inverting motor polarities automatically to close and open a door

Hi, I need to build a device that opens a chicken coop door. The idea is quite simple, a motor connected to an axle that pulls a string up just like a wench. It would be activated by a relay timer ...
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1 vote
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### Equations of motion in matrix form and energy consumption

I am working on Lagrangian derived high-dimensional motion equations for a robot in matrix form. The structure of such an equation is known: $M(q)\ddot{q}+C(q,\dot{q})\dot{q}+G(q)=0$ In here, $M(q)$, \$...
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### Can peltier modules be more efficiant with a medium other than air?

Peltier modules are said to be less efficient than conventional air conditioners. Can a medium like moving cold water over the heat sink increase the efficiency of a peltier module? By how much? ...
1 vote
111 views

### How to design an outrunner BLDC motor

I've difficulties to find a good documentation or a book to how to design an outrunner BLDC motor. My propose is, defined RPM and approximative kW and some other parameters, which are calculation ...
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### Raise/Lower 350lb Sawmill Head 12v Motor Specs

I am new to this site and have a problem to solve in an area that I’m pretty lost in. I can usually figure stuff out with the help of the internet and some digging but not getting real traction so ...
1 vote
50 views

### Will a motor with 1,16 Nm rotate a 50 mm gear moving about 12 kg

I'm not an expert in mechanics, so this is my question. I will buy the motor of the image below to move my door. In the motor shaft, there is a gear with 50 mm of diameter which will move the door. ...
131 views

### how much power is needed to move a linear axis

Ι need help calculating the power usage for a linear axis motor. it must move up and down at a maximum speed of 0.5 m/s a load of 50 kg What I did so far: The load (i.e. weight) acting on the motor ...
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### calculate torsion in a diffrent sized shaft

first of i know it seems like a homework assignment but it does not, it is calculations i need to do at work and it has been a long time since i studied this material. so I need help to calculate if a ...
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1 vote
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### What are some techniques for improving stabilization given a mechanical time constant?

Problem: I have a self-stabilizing system that utilizes an intertial measurement unit (IMU) attached to the hull of a vessel. The system self stabilizes by performing matrix rotations based on the ...
1 vote
1k views

### Connecting a custom 3d-printed part to an SG90 servo

I've very recently got into prototyping as I'm working on a project that I intend on making as simple as possible through conventional methods, just to learn general best practices. I have an SG90 ...
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### Mechanically increase motor torque

An electrical engineer here. Using a stepper motor for a robotic arm. A stepper motor at the base of the arm has a max holding torque of 6kgcm. The arm is around 30cm in length from this base motor ...