Questions tagged [motors]

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

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1answer
417 views

How do I build a dc generator at home for my presentaion?

I'm having a presentation about dc generators and I wanted to demonstrate how it works. Anyone have an idea on how to build one. I left my electric motors at home because of Christmas break, now I can'...
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1answer
174 views

Does a sinusoidal input voltage make a BLDC motor into a PMSM?

As the title says, does a sinusoidal input voltage make a BLDC motor nearly into a PMSM? From Sensorless Trapezoidal Control of BLDC Motors, it follows that a BLDC motor has a trapezoidal back emf ...
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2answers
186 views

Motor Controller Design Considerations

I'm working on developing a speed controller for a motor that is geared to rotate a mass. Currently, the motor in question has a step voltage applied to it and moves the mass at a relatively slow ...
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1answer
107 views

Charging a battery pack using a motor

I want to fit a Hub motor ($15kW$ BLDC motor) to my car to convert it into a hybrid vehicle. Would it be possible for me to use the same motor (as a generator) to charge my battery pack, while the ...
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1answer
365 views

Motorcycle Engine Vibration - Difference between left and right side

I measured the vibration (jerk) on the left and right side of different motorcycles. I tested different engine types: Boxer engine, 3 cylinder, and V4. I measured the vibration on the same route, ...
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1answer
511 views

Stepper motor holding torque without coils energized?

I want to know what torque a stepper motor can hold when stationary. They seem to only have one figure in specifications for holding torque which, I presume, is while coils are energised. How is ...
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1answer
439 views

Is there a more efficient transducer to convert mechanical energy into electrical energy than electromagnetic induction? [closed]

I know piezo film has one of the lowest efficiency to date when it comes to converting mechanical energy (or stress in the context of piezoelectricity) and motor (magnet and coiled copper wire) seems ...
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2answers
274 views

Energizing of armature as function of position in electric motor

How is the armature in an electric motor energized (i.e. main conditions on signal as function of position)? Let's consider the following parameters: $n_a$,$n_f$ the number of armature and field pole ...
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2answers
1k views

How to size a motor for a lifting mechanism?

I am building a machine that has to lift a load of approx 80 kg including the material and lifting mechanism's weight. The velocity requirement is quite low (around 4.5 cm/s or 0.045 m/s). The whole ...
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1answer
67 views

Will AC Motor Maintain Speed of Descending Object

Suppose we have an AC motor which needs to lower an object at a set speed. We use a PID loop to determine and correct positional errors. Presumably the PID loop will keep the current low as most of ...
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1answer
790 views

VFD/rheostat for motor speed control

I have a 3 phase motor and 3 phase power supply (400V, 50Hz) Currently this motor produces 1.5hp in torque and ~1750rpm. I need it to produce less. My question is: Is the best way to go about this, ...
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2answers
93 views

How do you mount a polystyrene foam wheel to a motor?

I have a wheel I CNC milled out of foam and I need to mount a motor to it. I designed and printed a part that would attach the motor to the foam, but I anticipated that the wheels would be wood back ...
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2answers
91 views

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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29 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, $M(q)$, $...
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27 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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2answers
42 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. ...
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1answer
47 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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0answers
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 ...
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1answer
19 views

What size of fan requires motors with a transmission? [closed]

I am wondering at what fan size/speed a direct drive motor is no longer sufficient to drive a fan? Phrased alternatively, what size/speed of fan requires motors with a transmission? For an axial fan.
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72 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 ...
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2answers
52 views

Selecting the right DC motor for horizontal motion

I have come across a problem that for the life of me I can't seem to figure out. I'm sharing this here in the hopes that the amazing community here can help push me in the right direction. The problem ...
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0answers
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 ...
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0answers
18 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 ...
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1answer
113 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 ...
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43 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+...
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1answer
104 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 ...
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13 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, ...
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19 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, ...
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0answers
33 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 ...
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91 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 ...
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0answers
95 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 ...
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21 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: ...
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16 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 ...
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3answers
158 views

How to calculate the torque created by a rotating motor?

I have watched this video where the speaker explained how the vertical spin of a quadcopter is stabilized, and how it could be unstabilized to make the drone rotate. Here is a screenshot of the video,...
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0answers
87 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 ...
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1answer
43 views

Why large industrial units combine induction and synchronous motors?

We usually use induction motors to turn electrical energy to mechanical, however synchronous motors are the machines on the other side of the grid (generation). A week ago we had a student visit to ...
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0answers
76 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
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0answers
31 views

DC Inverter motor AC utilization category

I am looking at specs of an air conditioner unit. It uses DC inverter technology and maximum current listed as 21.5A So are DC inverter motors considered resistive or inductive? What utilization ...
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0answers
141 views

what does 775 mean in a 775 dc motor? [closed]

I don't understand sometimes what numbers actually mean in some naming conventions of many types of motors. Is there a good repository of knowledge regarding this subject except for those boring books?...
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0answers
45 views

DC motor Magnetic axis of armature winding vs EMF

When considering the cross section of a DC motor we have: I notice that the Magnetic axis of the armature winding is aligned with direction of the EMF that will cause the rotation. Is there a ...
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1answer
86 views

off-scale torque measured - what is my torque arm?

I have assembled a benchtop torque measurement stand for evaluating electric motor and controller efficiency. The motor is 49kV , 5kW brushless outrunner. Input power reading is taken from motor ...
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0answers
25 views

Which type of motor can I use for my project?

I am working on a project of linear positioning where a bed is coupled with a motor driven high pitch multi-start back driving lead screw. I need the bed to be freely moving when the motor is not ...
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0answers
40 views

Coupling two double shafted stepper motors in series [duplicate]

Coupling two identical double shafted stepper motors in series using two identical drivers will that double the torque?
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1answer
88 views

Need to produce vibration amplitude of 200 um (approx) at natural (resonant) frequency, can be any frequency between 100 to 150 Hz

In order to conduct study, I need to produce controlled vibrations with amplitude (maximum) approx 200 um (micro) at frequency between (100-150) Hz. Vibration amplitude must be controlled with input ...
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115 views

Measurement of ICE torque

I'm seeking a precise description of engine torque. We talk about torque in terms of the twisting force that the piston exerts on the crankshaft with a radius equivalent of the rod throw. Assume these ...
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0answers
21 views

Correct terminology for a zero turn stator winding on a BLDC?

I'm designing a BLDC motor with some unique geometry constraints (~250mm long, ~45mm diameter with a ~35mm bore down the center) and am considering using straight copper bars carrying high current ...
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0answers
26 views

Calculating the proper power of a motor

I'm trying to build a filament extruder with some basic available tools and materials. Simply the main principle of the machine is to insert some amount of plastic raw material ( ABS in our Case ) to ...
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0answers
414 views

How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...
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70 views

Choose a DC Motor for a skateboard

My body weight and that of the skateboard is $M = 90\text{ kg}$ I want to move 10 meters in 4 seconds. $$\begin{align} x(t) &= (at^2)/2 \\ x(4) &= (a\cdot4^2)/2 = 10 \\ &= a\cdot16/2 = ...
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633 views

Determining brushed DC motor inertia for modeling a motor

I'm making an model of a DC motor, and following the guide for measuring motor parameters: I am having trouble measuring the motor's inertia, as the guide for this section is vague. This is a graph ...

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