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Questions tagged [motors]

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

172 questions with no upvoted or accepted answers
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1 answer
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Quick return mechanism for spring-loaded screw

I am looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a ...
PSz's user avatar
  • 93
4 votes
0 answers
98 views

Is there any side effect to soft start an AC motor?

I have a ground to water heat pump for my home heating/cooling (scroll compressor). The 3-phase 15kW-peak motor can be soft started but this option is off by default. I'm aware of all the positive ...
Kyle_the_hacker's user avatar
3 votes
4 answers
101 views

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 ...
Andrew Bechdolt's user avatar
3 votes
0 answers
204 views

PMDC Motor Characteristic Graph

I am trying create a graph similar to as shown below. However, I am confused as to how the torque is related to the characteristics. The graph that is to be replicated for certain parameters: The ...
Benny's user avatar
  • 31
3 votes
0 answers
333 views

Is having a keyway in aluminium for 30Nm a bad idea?

I'm designing an aluminium shaft hub for a 16mm keyed shaft with a maximum torque of 30Nm. However, stress analysis tells me that the keyway can suffer too much stress: If my understanding is correct,...
Kar's user avatar
  • 351
3 votes
0 answers
144 views

Etymology of the term "journal bearing"

Typically the word "journal" refers to a collection of written records, experiences, or transactions. However, there is a common type of bearing known as a sleeve bearing, radial bearing, or journal ...
Matt P's user avatar
  • 133
3 votes
0 answers
61 views

Rotating four cylinders with one motor/actuator

I have a setup with 4 cylinders placed next to each other in following configuration. The cylinders are made of .2mm stainless steel. I would ideally want to rotate them along their axis using a ...
touchaddict's user avatar
3 votes
0 answers
145 views

A round, plastic pinion in a lock?

I'm looking at a teardown of a Masterlock. The guts look like this What's strange to me is the black, plastic pinion that appears to be smooth and a strangely shaped cam: Here's the cam magnified: ...
John M.'s user avatar
  • 1,033
3 votes
0 answers
635 views

Upgrading to a brushless motor

I have a mini-lathe with a 500W 3/4 HP variable speed motor, that is run by a controller at two different gearings. However, even at the LOW gearing I find the torque to be a little inadequate. Is it ...
Wallace Park's user avatar
  • 1,635
2 votes
2 answers
714 views

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 ...
user15588486's user avatar
2 votes
2 answers
364 views

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 ...
Fareed Ahmad's user avatar
2 votes
2 answers
167 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 ...
tt600's user avatar
  • 23
2 votes
0 answers
2k views

Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
curioso's user avatar
  • 31
2 votes
0 answers
58 views

Overcurrent protection, limit for nominal current or stall?

Background: I'm currently working on a robotics design that will drill through soil. I have selected a 48V motor who's nominal current is 3.17A and has a stall current of 42A. I will be driving the ...
gunter's user avatar
  • 321
2 votes
2 answers
140 views

How can I model a hysteresis curve from data?

I have the task of modeling the current to torque mapping for a given motor. I have an experimental set up where I can retrieve current, torque pairs. Now my initial approach was to model the ...
ganto's user avatar
  • 137
2 votes
1 answer
108 views

clockwork motor output in joules formula

I'm trying to understand the output of clockwork coils in joules or watts for different coils. You know the pullback car or windup pocket watch mechanism. I have heard it also called power in the ...
ASH's user avatar
  • 121
2 votes
1 answer
483 views

How to calculate torque requirement for vehicle with Mecanum wheels?

What changes are specific to mecanum wheels when calculating torque requirements for a vehicle? I have the vehicle's mass, top speed and acceleration data.
manuj kushwaha's user avatar
2 votes
0 answers
160 views

How do I calculate the velocity of the piston?

I have a system with a motor connected to the trapezoidal lead screw. The lead screw is connected to the tube which is connected to the piston. The piston has to pump 1000cc oil against a pressure of ...
Tech Gravity's user avatar
2 votes
0 answers
71 views

Mechanical engineering, Please help me finding the torque and answering other doubts too

Below I attached two BLDC motor commonly used for skate boards, I am confused with the calculation of stall torque for these two motors,What i need to know, What is the maximum weight lifting ...
Eng. Jamshid's user avatar
2 votes
0 answers
476 views

Angular Velocity of motor shaft as function of Angular Position

I have a set of shafts that need to be rotated at a high frequency (~1000 RPM) but not at a constant speed. That is to say, the angular velocity of the shaft needs to be a periodic function of the ...
plam's user avatar
  • 21
2 votes
0 answers
49 views

Servo drive gear placement relative to the body

Is there a universal rule for servo drive gear placement? I'm planning to use this servo for a robotics project, but I need to know exactly where the drive gear is located relative to the body. The ...
CoilKid's user avatar
  • 121
2 votes
0 answers
42 views

Standard name for "retargeting" behaviour in motor controller

Over the years I've encountered a number of motor controllers (e.g., controllers in the NI Motion series) that incorporate what I usually refer to as "retargeting" behavior. Specifically, if the ...
Reign of Error's user avatar
2 votes
0 answers
81 views

How do I calculate the best mass for the highest linear speed?

I have a motor whose specifications say that its torque is 190g*cm. If I have the formula for the mass of the wheel vs radius, is there any way I can find the radius to get the best linear speed? The ...
electricviolin's user avatar
2 votes
0 answers
61 views

How are small refrigerator compressors started?

Small refrigerator compressors in the US generally all have exactly the same design and I am trying to understand their starting mechanism better. How exactly does it work? What I generally ...
Wallace Park's user avatar
  • 1,635
2 votes
0 answers
198 views

Validation of transfer function

I have developed a second order transfer function model for a permanent magnet dc motor in terms of speed and voltage. I had performed open loop no load experiments on the dc motor and derived the ...
user4122292's user avatar
1 vote
0 answers
72 views

How to calculate the torque disturbance of an unbalanced flywheel?

I would like to understand how an unbalance of a flywheel affects the dynamics of a simplified mechanical model. Assuming that the mechaincal dynamics can be modeled as (neclecting inertia of the ...
Zeit's user avatar
  • 11
1 vote
0 answers
49 views

Electric motors and Internal Combustion Engines compared

I know that Internal Combustion engines are rated in terms of peak power developed, while electric motors are generally specified in terms of continuous power output. Is there a good way to determine ...
Slartibartfast's user avatar
1 vote
0 answers
48 views

Counter-intuitive behavior of chain drive

In a chain drive system, sprocket 2 has a motor attached, sprocket 1 is being driven. The blue construction is static and immobile. Before starting the motor, both load cells show 0 (tare). ...
FlegmatoidZoid's user avatar
1 vote
0 answers
63 views

Examples of uses of different voltages as seen on motor nameplate

The electric motor nameplate (pictured) has a variety of different voltage configurations which are listed. I understand that the motor can be configured to run on different voltages by changing the ...
hamslice's user avatar
1 vote
1 answer
83 views

How do I wire up this Single Phase AC Motor? (Wye Arrangement)

The no-volt-release switch stopped latching on my single-phase planer thicknesser. The motor is under 1.1kw (1.5hp) and I understood that I would be able to drop in a generic switch. However now ...
James's user avatar
  • 11
1 vote
1 answer
99 views

Stepper motor response under varying load

I had a thought that came to mind that made me curious-- Though unfortunately I am not an ME. I was wondering if someone could assist me in working through my thinking, but you will have to be gentle ...
Nevermnd's user avatar
1 vote
0 answers
82 views

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 ...
Robert Werner's user avatar
1 vote
0 answers
41 views

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 ...
lidorov19's user avatar
1 vote
0 answers
49 views

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, $M(q)$, $...
ayr's user avatar
  • 226
1 vote
0 answers
120 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 ...
Singed's user avatar
  • 119
1 vote
0 answers
52 views

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 ...
Alex Baum's user avatar
1 vote
0 answers
281 views

VFD or soft start to minimize power consumption on starting a motor?

I want to use the smallest generator possible to run a standard three-phase AC well pump. According to this website and others, it is advisable to use a generator capable of 3x the running kVA if the ...
Diogenes Creosote's user avatar
1 vote
0 answers
47 views

Building a custom indirect actuator, any thoughts?

I’m trying to create a custom indirect actuator, that is controlled by a microcontroller, for a custom robotics project. I have selected motor and gears (according to Fd = W = T2*pi) so that the ...
gunter's user avatar
  • 321
1 vote
0 answers
111 views

Motor part winding start

I have a BITZER compressor type 4GE-23Y-40P, with a part winding start option Nennspannung = nominal voltage = 380-420 Frequ = frequency = 50 Betr. strom = maximal operating current = 43.9 ...
B.Mohammed's user avatar
1 vote
1 answer
422 views

Why are the synchronous reluctance motors not self-starting?

I have been studying synchronous reluctance motor since a month. I am curious to know why is this motor not self starting? If used with an inverter, this motor can be made self-starting. Or by adding ...
yogeshwari's user avatar
1 vote
0 answers
77 views

How much torque is needed to mix melted marshmallow with rice krispie?

I am designing a robot to make rice krispie treats! More specifically, I want to use a fork to mix the melted marshmallow with rice krispie. I am currently specing out the motor, and since marshmallow+...
Wei Xun He's user avatar
1 vote
1 answer
256 views

Torque Required for a stepper motor to rotate a socket wrench ratchet around an axis point

I'm trying to build a kinetic machine that rotates socket ratchet tools (e.g. https://en.wikipedia.org/wiki/Socket_wrench) to make a bunch of ratchet 'clicking' sounds for an art project. I'm trying ...
melonhead's user avatar
1 vote
0 answers
16 views

DIY device to repeatedly depress and release gas pedal on a vehicle

The pedal needs to be depressed about 1/2 to 1 inch, once every three minutes. I believe the best way to do this will be with a rotating arm of length 2 to 2 1/2 inches that has rollers on each end, ...
mathematrucker's user avatar
1 vote
0 answers
23 views

Secure loads to gearbox shafts

I have a sculpture that is designed to rotate over 3 axes at max. 30RPM and is mounted on an aluminium disc. My plan is to use 3 of these geared steppers and secure the sculpture to the Z-axis shaft, ...
John M.'s user avatar
  • 1,033
1 vote
0 answers
56 views

BLDC Motor underwater ; weird behaviour

I recently was riding my e-bike (with a bldc hub motor) and decided to cool the motor (it -the stator- was approx 100-150 celcius I think) in the river. The controller is on the top of the bike and ...
Maarten -Monica for president's user avatar
1 vote
0 answers
205 views

Given a BLDC motor with one shaft, where should I attach my encoder?

I have recently purchased an ODrive servo controller made for hobby BLDC motors. Since I had a BLDC motor at home, I did not purchase a dual shaft motor when I got the ODrive. My question is if I ...
user391339's user avatar
1 vote
0 answers
199 views

Wobbling DC motor head

I have used 250 watt DC motor, for DIY electric potters wheel. Motor rated with RPM 3300 and geared reduction to 330 RPM. The issue I am facing is wobbling of the motor head. This issue is with the ...
aashunkon's user avatar
1 vote
0 answers
26 views

Axis connection types

Complete hobbyist here. I have two questions I have a problem figuring out. I have hard time finding information about axis and types of connections they have. For example take this worm gear reducer: ...
somerandomusername's user avatar
1 vote
0 answers
23 views

how do you calculate viscocity from torque arm load cell measurements?

I have a piece of company developed equipment that uses a pot mounted on a rotating base plate with a 0.15m torque arm and load cell, a mixing paddle is used to stir the mixture while the controller ...
Chris James's user avatar
1 vote
0 answers
175 views

Is it possible to have the load cell signal as feedback to the servo drive of the servo motor?

In my project, I have to control the linear motion in one of the two modes. It will be either in position control or load control. for the displacement control, The servo motor takes the quadrature ...
Aayvu.com's user avatar
  • 163