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Questions tagged [rpm]

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1answer
8 views

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

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 ...
1
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1answer
38 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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1answer
43 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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2answers
84 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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2answers
116 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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1answer
37 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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0answers
88 views

Formula for RPM and its relation with slot stator

I want to clarify a formula regarding RPM. The formula \$\mathrm{RPM} = 120f/p\$ where \$f\$= frequency and \$p\$= # of poles. But what if the motor has different slots, for example, a 24 slot stator ...
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2answers
144 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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1answer
36 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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0answers
76 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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2answers
72 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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1answer
191 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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1answer
157 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 ...
1
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1answer
68 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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2answers
109 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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2answers
975 views

What happens when a motor is spun faster than its rated RPM from an external force?

I've seen plenty of questions wondering what happens when voltage is applied that would exceed the RPM rating, but what happens on the voltage/current side when something external - the wind spinning ...
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1answer
168 views

Sizing a motor for cake turntable

I have to build an automatic (self-revolving) cake turntable to rotate a maximum of 15 pounds and I'm not entirely sure as to how to size the motor to be used (in terms of maximum current or voltage ...
0
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1answer
289 views

Simple way of measuring RPM of motor by How to make Frequency/Pulse counting circuit

I want to measure RPM of a motor. For this, I am planning to put an assembly where an IR LED facing with IR sensor under line of sight. With every rotation, the line will be cut once - and hence the ...
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0answers
121 views

finding air gap shear stress in a permanent magnet generator

I have found that the air gap shear stress is a limiting factor when sizing a generator, but how do I find the value for it?
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2answers
255 views

RPM measurement using interrupt

I am controlling the speed of the motor and measuring RPM using IR module. The method I used works fine (I rotated the motor manually). I am facing problems when I connect the motor to the power ...
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2answers
3k views

How to calculate RPM using frequency

I am working with VFD (CT-2002ES-A75). It shows output frequancy on it's seven segment display. However It has a parameter(Cd46 on page 27 in the manual) for display the current RPM of the motor. For ...
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3answers
613 views

3-phase Motor RPM depends on power line frequency?

I have a 3-phase motor but my knowledge on the topic is almost null. But, you know, I have also curiosity to satisfy. The motor's nameplate reads: ...
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1answer
98 views

Rpm in stepping motors

Can rpm be in decimals like 2.45 rpm in stepper motors? And is it possible in servo motors? Can stepping motors be used in closed loop system?
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1answer
88 views

DC motor characteristics and control

I don't have a lot of experience into detailed / calculated selection of DC motors based on their specs. Now, I'm starting to do it for robotics competitions as I'm progressing to more serious ones. ...
0
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1answer
114 views

Power of motor needed to carry 2kg of weight at speed of 10 kmph [closed]

I need to make rc car which can carry a weight of 1-2 kg and can give speed upto 15kmph, can anyone please tell me what should be rpm and torque of motor for this purpose ? Thank You !
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2answers
818 views

Motor to spin slowly, low torque [closed]

I am trying to find a motor to use to spin a cardboard wheel to drop balls through a hole. I want this to happen pretty slowly, around 10rpm. It also needs almost no torque, as it is spinning ...
0
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1answer
88 views

Reading rpm and also reading 5 HX711

I have a code where I have 2 functions: 1 - read_loadcell - which reads 5 HX711 (5 load cells) 2 - rpm_read - which is supposed to read rpm's using an inductive sensor. Basically I have a metallic ...
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2answers
409 views

DC motor speed and torque circuit equation, why is the current changed while voltage constant?

so i have a power window motor with spec the voltage 12V, continues torque 3 N.m, max load current 12A, and 90 RPM. the resistance is 2.5 ohm i understand that torque is correlated with current and ...
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0answers
392 views

Count RPM on diesel truck using an Arduino

I'm trying to make an truck RPM reader that will output a signal once the RPM's exceed a set-point. I believe that I can easily code an Arduino to do this, but I'm having trouble with the circuit. I ...
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4answers
265 views

using inductor in series with a psc motor

I'm trying to reduce a PSC electro-motor rpm to about 80% to 90% of it's nominal speed. It is attached directly to a centrifugal fan and a mechanical approach is not possible. The ratings are: 450 W, ...
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1answer
2k views

DC motor RPM accuracy/precision

Small, permanent magnet, brushed tri-phase DC motors ('toy motors') may give a speed/torque curve, or at minimum a no load RPM. What is typical RPM accuracy relative to the datasheet, and how precise ...
1
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1answer
581 views

Measure rpm of a DC motor using two timers/counter and IR sensor (atmega 328p)

I'm trying to measure the speed of a DC motor. I have an IR speed sensor connected to the T1 pin(PD5) of an ATMega 328p. My idea is when there is a change from LOW to HIGH, a counter is incremented ...
0
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1answer
98 views

How much voltage will i generate from this DC motor? [duplicate]

http://www.moog.com/literature/MCG/moc23series.pdf i am using the C23-L33 model. if i rotated the motor at the rated speed of 3000RPM, how much voltage will i generate? can I please know the exact ...
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3answers
68 views

IC that measures RPM mounted on rotor without magnetic field [closed]

Does this chip exist, there only seem to be hall sensors?
6
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6answers
34k views

Can I use a resistor to slow down a DC motor?

I have a few DC motors of 1.5 V and 9 V and need them for some applications. These motors run at a certain speed (rpm). But I need to slow them down. Will it be a good idea to connect a ...
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2answers
228 views

Horn noise affects RPM data

I am working on a Data Acquisition project using Arduino Due for petrol scooters where I am trying to collect 6 types of data - acceleration, location, brake, throttle, horn and RPM of the wheel. I'm ...
2
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1answer
1k views

Correct PWM frequency for motor [duplicate]

I am using 4500 RPM motor.To be specific,this is the motor I am using https://www.robomart.com/4500-rpm-high-torque-dc-motor. I am using Cytron MD10C motor driver to drive it.The PWM source is ...
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2answers
2k views

Finding proper motor for lead screw lifting?

I need to lift amount 0.6 kilogram up to 20 cm in 2 second with Permanent Magnet DC Motor with PWM speed control driver ,for this device: So i have one PM dc motor with 300 RPM MAX,12 V and 2 Watt ...
4
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1answer
114 views

Want Square Waves based on Injection Timing of 4-Stroke Engine

Recently, I am working on ECU of CNG Auto Rickshaw having 4 Stroke Engine. Here, Image shows the Engine of Auto Rickshaw. I have already taken reading of MAP, TPS and RPM. And now I am working on ...
2
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1answer
307 views

Right power supply for DC motor with load

I am trying to turn a disc of 10" of 20kg with a DC motor. I would like to get at least 1200 RPM. The motor is an Ampflow A28-400 and the power supply I am using is an adjustable power supply by ...
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1answer
968 views

Setting a Motor so that it spins at a certain RPM [closed]

I'm making a record player for a school project and I'm having trouble with the motor that will spin the platter. I'm using a belt drive system, so I have two circles connected by a pulley system. ...