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140 Threads found on Rpm Speed
I am currently working in the project which fetches OBD (On Board Diagnostic) information from the cars. Well, I could read rpm, speed and other data and ensured that the communication is happening in proper way But the problem is, I couldn't find any PID for fetching the odometer reading...Since it is one of the important parameter for our proje
The liquid and the amounts of liquid that are to be stirred aren't very large nor very dense. Ok the liquid is sort of dense, this stirrer is meant for mixing liquids for personal vaporizer (e-cigg) which consists of 30% PG(Propylene Glycol) and 70% VG(Vegetable Glycerin). PG is almost like water while VG is really thick like
hello What rpm speed ? or pulses per second ? You don't use debounce of RX detection ? so you can get bad detections RX must stay enough time to 1 , to valid this information maybe recheck after a litle delay of any ?Sec... if Rx==0 you spend a lot of time with all instructions to do ! so you can miss some information Best way is to
Motor torque and rpm need to match, the work being done for proper sizing. Weight, acceleration, speed. Stall current will be your starting current and this will drop to idle current at full speed if there is no friction, otherwise higher. Once you choose motor power and time duration, energy required between charging, you can choose (...)
Hi I can run the 6V 2A Stepper motor with the help of L298N driver.But how to increase and decrease the rpm of motor with the help of PWM without changing delay.And is the L298 driver is protect-able or not? Thanks and Regards, M SAI KIRAN.
The bipolar geared stepper motor I am planning to use has a resistance/ phase of 8.5 ohms per phase, inductance of 2.14mH per phase , normal current per phase is 2 amps, holding torque of motor is 0.8Nm, gearbox ratio is 1:8, holding torque of gearbox is 6.4Nm. The maximum permissible rpm of gearbox shaft is 200 rpm. The input voltage rating of the
I used a triac in my homebrew fan speed control. The fan was a 'squirrel cage' type (mounted on a wood stove). The type is important. As I understand it, most fans cannot be speed-controlled by a triac, with their rpm dependent on the frequency of the AC supply. If you simply limit power (as with a triac), the normal fan tries to spin at (...)
I once made an rpm meter. I remember counting the pulses within a given time period, like half a second was much easier and yield higher resolution than measuring the time between pulses. On the other hand counting the pulses in a given period gives you a much smaller refresh rate than measuring the time between pulses. Those are my two cents.
I got a BLDC motor from an old HDD (it has no Hall sensor). I made a driver circuit with an Atmega-8, one ULN2003, six opto-couplers and six IRF610 MOSFETS. Wrote the following C code to send sequential pulses to the gates and the motor is running freely without any kind of feedback at a relatively low speed (my idea is 4 to 5 rotation/sec). speed
emergency landing of the quadrotor in case of a failure of a propeller. You'll want the craft to descend slowly. To ensure this you either need to (a) install an altimeter, or (b) spin the propellers at an rpm which you determined (by previous experiments) is the proper speed so that 3 propellers will reduce altitude
hello, the only way is to know the linear speed of the rotor (on his circonference) VL= PI * Dia * N so Dia= VL / (PI * N) N=rpm VL in Meter per Minute Dia in Meter it is an unusual request ? How do you can have an accees of the rotor circonference inside the stator ? what is for ?
THe current for Fans starts at a fairly constant current and then rises slowly to perhaps double the current from 12 to 24V as more work is done pushing air. Typical 4" muffin fans take about 5W and you would get perhaps 20% of the rpm at 12V. Adding resistors would only reduce the fan speed and dissipate more power in the series R's and be ineff
The missing info is your wind generator power vs air speed and stall threshold. Then compute time to charge up 4Wh. (1Ah*4V~) vs wind speed. Unless rpm is regulated separately from boost DC-DC regulator for optimum power transfer , expect far less than rated power. Better to use higher voltage gen and Buck current booster with MPPT control (...)
I am using a pic16f877a, an EM-506 GPS module, and a 16x2 LCD to display the speed Over Ground and using Timer 0 as the timer and Timer 1 as a counter to display rpm's. I can get the rpm's and speed to display individually but not at the same time. For the tachometer, I set the pre-scalar to 0x07 to create the longest delay (...)
Hi All, I would like to control washing machine AC motor to have speed of 80 rpm. I know it sounds weird but this is just a part of the project. I was thinking to use the same concept of DC motors to control the speed of AC motors. the easiest thing was to use PWM technique. I would use 220V source and the circuit should look like (...)
Is adapted rpm code what you really want? The rpm code is originally to count the number of times the IR beam is broken within a fixed time period so it can calculate the speed of the fan. In your application it seems all you need to do is count the number of times the beam is broken and keep incrementing the number until you reset it. Am I (...)
can you plz explain the flow of this code? module(clk,mpulse,speed); input clk,mpulse; outputspeed; wire speed; regcval, tcount, quot,rem; reg zero,sts; wire rfd; assign speed = (zero?16'd0:quot); always@(posedge clk) begin if(!mpulse && sts) begin tcount = cval; sts = 1'b0; cval = 32'd0;
i m having a permenent magnet dc motor that runs at 1000rpm speed at 12v rating, it is possible to control speed in the range to 10-50 rpm using pot. please suggest some circuits regards kalyan
if using a microcontroller such as a PIC24 you can connect the hall sensor to an interrupt on change input you then count the interrupts over a period of time (using a timer interrupt) and calculate the rpm
in a PIC24 based mechatronics trainer we use the motor speed sensor is a simple system where a fan interrupts a beam 1. the signal from the fan is fed to a digital input with interrupt on change - a count is accumulated 2. timer runs for a tenth of a second and the calculation for rpm is (the fan h
i'am doing tachometer using microcontroller AT89s52 in this i'am using sensor to detect the pulses of motor and i want display the speed in lcd that is for below 100 rpm i want to display two decimal point and below 1000 rpm i have to display one decimal point and above 1000 rpm their won't be any decimal point please some (...)
Check the plate on the motor for AC there is the AC volts ,number of phases ,internal connection type,current for fixed ac motor speed,and optimum rpm for it if using AltiVar(freq converter) the actual speed is displayed on the alivar it self the issue is with the DC motor you have to use external tool like TacoMeter and for current don't (...)
To obtain the response of output voltage to shaft rpm, you can use a paint mark on the shaft and use a simple pulse counter with an optical pickup to measure rpm. Make sure the generator output is not loaded, otherwise the output voltage will drop due to the load.
It is not a speed regulator. Instead it is a simple "light dimmer circuit" that reduces the average voltage of its output. A speed regulator senses motor rpm then adjusts the output voltage for the speed to be regulated.
i am unable to display the rpm speed of my motor on LCD screen. While debugging in keil, I get all values correct. But when i load the program in the 8051 controller IC, it doesnt display value on LCD screen. It shows 0 rpm continuously. Here is the code. please help. #include #define LCDDATA P2 sbit BUSY=P2^7; sbit RS=P3^7; (...)
If a 3 phase inverter feeding a BLDC based water pump is switched at 400Hz?..then this should mean a motor speed of 8000 rpm. However, what if the DC Link capacitor voltage is not enough for the motor to rotate at this speed, in spite of the commutation being at 400Hz? Will the motor still rotate but will it ?slip?, and rotate at a (...)
Size of the pulley? You want direct drive or belt driven? If you can use belt driven then use a flywheel fixed to motor (if dia of flywheel is larger then dia of your pulley then rpm of pulley will increase).
is it also true that PWM can be better at low rpm?
hello what PIC family you are using ... sprintf can be used for 18F... and what unit for other info like rpm , Fan value is it integer, long or float ?
A high current capable boost converter is what you want. It will run differently than a normal fixed output, slightly variable input - you need a wide range of input from the full speed armature voltage, to as low a rpm's back EMF as you can manage, so that your braking recoups as much kinetic energy as possible. And your braking effort needs to b
Use Hall switch. He can measure rpm or rotating rotor at all. Lots of fans have already embedded Hall switch sensor. If speed is under normal speed or 0 rpm this tell you to check fan. Pay attention on Cool&Quiet option. Best regards, Peter
Hello there, You would write a formula for speed calculation. For example. using timer for a second.. check how many pulses is coming?? like 1sec=200pulses then rpm is 50 and 1 sec=1000pulses then rpm become ((50/200)*1000)=250rpm. Just try these method it might work.. and revert back me. Best regards
Hey guys, This question is for electric motor experts: 93340 I'm here with a BLDC motor. (No brand... Sorry) The motor is rated for 100W. It is a 4 pole (2 pairs) rotor with 12 teeth stator. The nominal voltage is 24V. The no load speed is 8000 rpm The nominal speed is about 6000 rpm. The magnets are ferrite.
hello, this is the first topic in this forum and i happy for register here :-D i have 2 prob. in "single phase induction motor" and i can't solve them ======= ======= 1)360 w , 220v , 50 hz , 4 pole , R(main)=6 , R(aux)=10 , X(aux)=14 , X(m)=48 , constant torque=.72 , rated speed=1440 rpm determine: torque at full load ====== 2)
Hello! I'm not sure you can do that with a PIC. Well, it depends on your encoder, but for instance if you use a 16 bits encoder running at 6000 rpm, you will get 6.4 million transitions per second, and catching interrupts at that speed will be tricky. What kind of encoder is it? Dora. Update: apparently the encoder is not that performan
you're comparing apples and oranges. The angular velocity is constant everywhere on your fanblade, the LINEAR velocity is not. And you don't "need to calculate the angular velocity of the blade", you already stated that it's 300rpm!!
Current is related to torque of acceleration and loading above the idle current, which you have not specified. Starting and stopping voltage is motor dependant torque vs speed, load and stiction of bearings. Looks like a good helicopter motor, since loading at starting rpm depends on acceleration factor and not wind, it could max out or be
Hello all, I'm trying to set up a wind driven small generator. However, the wind speed is less at times and is about 250-300 rpm at an average. Even a small, seemingly fast windmill might do most of its work at 600 rpm, not nearly fast enough for a car or truck alternator. This means that gearing up with pulleys or other methods is needed, (...)
Usually Phase angle control method will be used to control the speed of 1ph AC motors. ex: fan "Power ratings 500 Watts 18,000 rpm" - I hope it must be universal motor. Ex: mixie In universal motor we can use the same phase angle control method but mostly different rating tapping from the winding will be taken out and rotary switch or p
1/8hp ,230v/50Hz ,6000 rpm @ No load 6000 rpm @ 50 Hz would be hardly achievable without a gear... Maximum (synchronous) rotor speed of single pole pair motor is 3000 rpm.
DC motor rpm is high. How will you get exactly 360 deg rotation? How will you know when to stop the motor? You can have angle control with stepper motor.
Hi Im having a problem when i display the speed of the motor on LCD (16X2) causes the motor to stop. Im using PICDEM MCLV board (Brushless DC Motor) and is connected to EasyPic 7 development board (LCD is on) via RS232 cable (UART). The LCD does display the speed (rpm) of the motor but after 5 seconds or so the motor stops running. I (...)
Just tell me yes or no whether rpm of a motor can be increases by a vfd ? The question has been already answered in post #2. what do you mean by field weakening ? what is it ? It's a well defined technical term in power engineering. Field weaking related to VFD is briefly discussed here
Hi all :) A very nice and interesting discussion going on here. Quite learning. I want to drive a stepper motor(1.8 Step Angle)at 1500 rpm, for which I require 5KHz freq. If I supply a clock signal of 5Khz to the Clk pin of l297, will I get the same freq. on output i.e ABCD of motor? I will be using L297 + l298.
The gennerated voltage will be about 80 - 95 % of the motors ordinary characteristic. i.e. if a motor runs at 18,000 rpm at 12V, then at 18,000 it will generate 10V+ Frank
Dear All, We are using MC33035 ASIC for BLDC motor speed control with 3-H-Bridge. We have already done up to 6000 rpm on One 8 pole motor & motor load current is 0.6A cont. & 1.5A peak. Can we use the same circuit for 15000 rpm with different 4 pole motor?
Brilliant - I love it! In days gone by there was a desktop computer called the DEC Rainbow. It had clever, variable speed floppy drives and it didn't take long for engineers to get them to play music by controlling the rpm.
What is hidden inside that rar, and what is relation of that rar with your question ? See this projects:
Two adjustable speed drives (separately excited dc motors) have maximum speeds of 1000 and minimum of 500 rpm. speed adjustment is obtained by field flux control. Motor A drives a load requiring constant developed power over the speed range and motor B drives a load requiring constant torque. All (...)