Questions tagged [rpm]

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How is power consumed by an induction motor calculated based on speed (from a VFD) and torque induced by the rotor shaft?

I've been tasked with carrying out some design improvements on my company's production floor. There is a flat belt conveyor assembly line, whose movement forward movement is controlled by a single ...
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3 answers
322 views

Is it OK to reduce fan speed by reducing voltage?

I have this air cooler whose speed is just too much even on the lowest speed setting, so I added one more speed controller(or regulator) in series which is basically used to control the ceiling fan ...
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4 answers
226 views

How to reduce the RPM of a DC motor

I need a small 3-pole commutator motor with 4000 RPM @ 12 V and the best I can buy is 8000 RPM @ 12 V. I am considering buying an 8000 RPM motor and replacing the existing windings with thinner wire. ...
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1 vote
1 answer
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Brushed DC Motor Closed Loop Speed Control Under Load

I've designed a PI controller to control brushed DC motor speed between 0.6Hz - 6Hz (RPM:36 - 360). When I control the motor speed at 0.6Hz (approximately 4.0V supply and 60% PWM duty), it can rotate ...
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8 votes
4 answers
825 views

Is it normal that a 12 V DC motor changes its RPM depending on its orientation?

I got a 40mm brushless DC fan from SHENGSHIDA which is rated at 12V and 0.15A. I supply it with 5V from a Raspberry Pi. I noticed that the rotational speed of the rotor changes depending on the ...
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1 answer
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MAX9926 Maximum Variable Reluctance Input Frequency

I am planning on using the MAX9926 to read 2 variable reluctance (magnetic pickup) sensors installed in the crankcase of an engine. The sensors will read the teeth of the starting gear to get the RPM ...
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-2 votes
1 answer
53 views

What is the effect on speed and power when we connect three motors on a single shaft? [closed]

Rolls Royce used three 750R (YASA) motors in their aircraft "Ionbird." All motors are mounted on the same propeller shaft. What is the effect on the overall speed and power of the motors? ...
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0 votes
3 answers
373 views

How can this BLDC motor have constant torque over its RPM range?

I was going through this catalogue of BLDC motors for my EV project. I found two motors in it, one rated at 2.5 kW of peak power, and the other 6 kW of peak power. My questions are as follows: It is ...
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0 votes
1 answer
630 views

How to convert pulse width modulation (PWM) of DC motor to RPM or distance traveled?

I have a DC motor attached to a robot car wheel which can give me the PWM data as the motor is linked with the TB6612FNG H-bridge, but there is no other sensor to measure the RPM of the wheel. The ...
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0 votes
2 answers
181 views

Fan humming sound when decreasing speed with a dimmer [closed]

I am using a ~large 400mm wall mounted metalic fan (specs below). I wanted to decrease the speed (and noise) with light dimmers (I tried 2 models so far) but when speed is decreased it makes humming ...
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1 answer
234 views

how can rpm of a brushed dc motor be measured

My brushed dc motor spec. sheet lists BACK EMF CONSTANT (Ke) V/K R.P.M. 20.8. So knowing/controlling the voltage sent to the motor would make it easy to calculate, and set the rpm. My problem is my ...
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1 vote
2 answers
90 views

Underwater train project's battery powered DC/BLDC/Stepping motor gear/non gear requirements and water proof sealing problem

I am a software developer by trade, having put together a few beginner Arduino projects and such. My next project entails an underwater roller-coaster (without loops, just going over the surface, so ...
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2 answers
41 views

Determination detection of direction with 2 optic sensors which are on opposite sides of disc

I would like to ask you is it possible to detect the direction of rotation with 2 optic sensors which are on opposite sides of disc? In the disc is small hole, when the part with hole goes through the ...
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1 vote
1 answer
88 views

Average data transfer rate

I am learning computer architecture and organization I am stuck in the following question. Consider a hard disk with sector size 1024 bytes, 5000 tracks per surface, 64 sectors per track, and 8 ...
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1 vote
2 answers
422 views

DC Motor, Torque vs RPM

I am making a pulley system (for an electric bike) that requires about 300rpm and 40lb-inch torque. The motor that I am looking at is a 24V DC Permanent Magnet Electric Motor Generator 250W 2750RPM ...
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4 votes
3 answers
440 views

Need to increase the amplitude of op-amp output

I'm using this circuit to measure the RPM of a DISC rotating at 24000 rpm. This circuit is working fine. But the problem is with amplitude. It should be of 4.2V, but actually is of 2V as shown in ...
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0 votes
1 answer
666 views

What is the relationship between the RPM, power, and impedance of an induction motor?

Does an induction motor draw more power at higher RPM? Increasing the frequency of the AC power supply will increase the RPM of the induction motor. However, that should also increase its impedance (...
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2 answers
312 views

How to lower the RPM of a motor without using PWM or gears?

I need to lower the RPM of a simple DC motor to almost 20 - 30 RPM for some reasons. I cannot use PWM signals or gears to lower the RPM of the motor (I know how to use them but I want a simple ...
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0 votes
1 answer
140 views

Does this motor have a gearbox inside?

I have a DC motor and the sticker says its rated for 24Vdc and 3700rpm. There is an AC tacho inside it which I am using to measure the speed of the motor. So when I run the motor with a 24Vdc supply ...
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1 answer
874 views

Converting pulses to RPM

I have a question about how to take an output from a sensor and calculate RPM. The sensor produces a square wave at a maximum frequency of 1kHz. So I think I have two options: Count rising edges in a ...
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0 votes
3 answers
167 views

Why don't *small* electric cars use small cheap hobby motors? [closed]

The automotive blogger Jason Torchinsky recently bought an inexpensive electric car, a Changli Nemeca, whose motor he describes as being powered by five car batteries and producing 1.1 horsepower (820 ...
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0 votes
1 answer
55 views

How much load DC motor can move? [closed]

with 1000 rpm how much load it can move on 12v? I want to no load of DC gear motor on 12v and 5v
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0 votes
2 answers
108 views

Difference between analog and digital rpm controller

I was doing some research into RPM governors for diesel engines and could essentially find two different approaches. One was based on some NE555 based PWM circuit that based on the input RPM from a ...
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0 votes
1 answer
68 views

BLDC Motor question

Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it. I would like to use motor between 15 and ...
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2 votes
2 answers
656 views

Alternator output rating

Overview: I am currently working on a project that requires a 24v alternator, which is powered by a mower engine. This engine in particular runs around 3,000 RPM, and does not exceed 3,200 RPM (based ...
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0 votes
1 answer
80 views

Torque issues with DC motor

I am currently trying to use a DC motor with a lead screw to eventually open an close a window. My window requires around 2 kg's of force to open and the distance that needs to be traveled is 20 ...
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0 votes
1 answer
115 views

Calculations for a DC motor

I want to open and close a window using a DC motor and a lead screw. My window is 20 inches long. I know buying recommendations are outside the scope of this forum. I have little to no knowledge ...
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0 votes
1 answer
53 views

How does gearing affect power generated by a permanent magnet DC motor?

I am currently working on a project to harvest electrical energy from a rowing machine. I am trying to make use of gearing ratios to adjust the resistance level offered by the system, and the impact ...
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0 votes
3 answers
187 views

Alternator and voltage regulator recommendation(s) for antique engine based 12V power source

What would be good hardware to provide 12V DC for battery bank charging driven by an antique stationary engine that does not run at a steady RPM? These old engines can run on practically any liquid ...
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0 votes
1 answer
774 views

How to calculate RPM from a square wave signal Voltage-Time graph

I'm struggling to understand how to show the relationship between the input and output of a hall effect sensor used as a wheel speed sensor through mathematical expression. How can I calculate the RPM ...
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0 votes
3 answers
6k views

Correct way of calculating BLDC torque for a given RPM and Current

A permanent-magnet 3-phase brushless DC electric motor is attached to a load. Motor is operated with vESC6.6 inverter, which is software-limited to 140A. Measured efficiency at maximum power is 81%. ...
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0 votes
2 answers
162 views

Is 1 Hz equal to 1 rotation of a motor shaft?

I'm rather new to the world of electronics but I have been trying to find the frequency of a DC motor. I've found that 1 hz is equal to 1 revolution per second, but does that refer to shaft rotation ...
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1 vote
1 answer
119 views

Confusion with RPM calculation of a DC fan from its datasheet

I want to calculate pulse periods from a tacho output of a DC fan. I want to read pulses by a MCU and convert them to RPM and display in LCD. But I'm confused with the following description of RPM ...
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5 votes
3 answers
5k views

If a high rpm motor is run at lower rpm, will it produce more torque?

I did the following calculations: Max current = 1.2A, Max voltage = 12V Then power = 14.4 watts = 0.019hp Rpm = HP * 5252 ÷ torque I need a torque to 2kgf-cm = 0.144 lb-ft Gives rpm= 698. Thus this ...
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2 votes
2 answers
256 views

ratiometric hall effect sensors outputs at high RPM

Im using an allegro A1308 linear ratiometric hall sensor to measure the rpm and angular position in a shaft rotating at 20K rpm. My magnet is a 2mm dia 1120 mT magnet placed at around 15mm from the ...
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0 votes
1 answer
35 views

How to properly utilize RPI 1391

I'm trying to get going with the RPI-1391 sensor but I'm obviously doing something wrong. I'm connecting it to a Raspberry Pi, where: Pins 1 and 3 are connected to Pi's ground Pin 2 is connected ...
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2 votes
2 answers
240 views

Is there an economical 2-3 RPM 120v motor with speed control? Or what components could I use to achieve that scenario? [closed]

I've got a mechanical design for a piece of catering equipment and I need to figure out a way to achieve some variable speed control for a slow RPM motor. This is a direct drive application (imagine ...
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1 vote
1 answer
276 views

Motor Speed Output Signal [closed]

I need an advice. I just got a DC motor and its controller board. On the controller board it has 6 pin/wire: +12V, GND, PWM, ENABLE, DIRECTION, SPEED OUT. What I want to know is how do I interpret ...
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0 votes
1 answer
91 views

Calculating RPM from Angular Changes

For a project, I have to determine the RPM of a turning resolver. I can correctly read the angular position of the resolver as as a hex number via an RDC. This number is then converted into a 14-bit ...
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0 votes
3 answers
1k views

Why does my shaded pole motor barely rotate when driven at 1/2 its rated voltage?

Hello electronics community! I'm attempting to service a shaded pole motor (pictured below) that is used for rotating a cylindrical fan from an electrical heater. The fan stopped rotating and so I ...
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0 votes
2 answers
284 views

Bouncing at some points in square wave

Well I am trying to make RPM and reading steps values 0-24 Volts. but in square wave there are a bouncing point which is illustration with red arrows marked. it makes electrical noise generation and ...
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0 votes
1 answer
53 views

Thermoelectric Cooler sensor

My team and I are testing our Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A from Adafruit. We are using an external power source and sensors to get readings for the current, voltage,...
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1 vote
2 answers
711 views

Run 1800 RPM motor at 3600 RPM

I have a 2”x72” belt grinder with a Brook Crompton bf4n.75-2 motor. It is connected to a Teco L510 VFD. Running here in the United States on 110v. My question is about turning up the RPMs sometimes ...
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0 votes
1 answer
49 views

Is there a limit for voltage a PM generator gets to based on RPMs?

I build different small PM handcrank generators for fun, Recently I built a single phase generator and printed myself a couple transmissions. Now as far as I know 3 things affect voltage, speed of ...
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2 votes
1 answer
244 views

BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?
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0 votes
2 answers
194 views

DC motor parameter identification using microcontroller

I've built a DC motor controller which measures the speed and current (not really sure yet about current values) of a permanent magnet DC motor. I plan to connect different PM DC motors. Is there a ...
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-1 votes
1 answer
682 views

What motor do i use to rotate a tumbler at low RPM and high torque which run by a battery charged by solar?

I am gonna run the motor to turn a tumbler of 50-85 kg @ 5 rpm MAX. The motor will be powered by a battery which will be charged by solar. So should i go for a DC or AC motor? Single phase or 3 ...
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1 vote
1 answer
3k views

Is this alternator W RPM input circuit ok and how can I improve it?

I need a robust and reliable way of taking a RPM signal from the W terminal of a standard automotive alternator. Most of the time the signal will come from a 12V alternator but there is a requirement ...
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1 vote
2 answers
181 views

What are these SOT23 components in this RPM gauge circuit?

I'm trying to work out the input portion of the input circuit on a digital RPM gauge. It accepts a W input from a standard automotive alternator. I can't identify the JCL446 which only uses two of ...
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1 vote
2 answers
117 views

Having difficulties running AC compressors from a generator on a boat

I have a problem that has me stuck and it’s marine related. When my ship is on shore power the AC system works perfect with no defects the evaporator and compressors comes on. When I switch over to ...
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