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The washing process is made by powering the motor windings for less than 1 second per turn. What occurs is that the magnetic brake is in general connected electrically to the water pump ( this way manufacturers save 1 switching device ), that means, energizing the brake, releases the basket to spin and just during draining process is when you can s
Hello. I am building a magnetic blender, it's really nothing more than an PC fan with a hard-disk magnet attach to it and then placed in such a way that you can place a glass beaker on top of the fan, of course without touching the fan, then you place the liquid to be mixed into the beaker as well as a little peace or rod of a metal that respond
Torque is proportional to Current HP is proportional to V*I Due to variation of torque between phases, more phases gives smoother torque. You can search for waveforms depending on size and drivers using magnetic Hall sensors for commutation
Here are suggestions where the sensor has no direct connection to the engine (in case that is what 'wirelessly' means). * The alternator produces a changing magnetic field. Perhaps it is strong enough to be picked up by a coil of wire. * High voltage goes through the spark plug wires. It should be possible to detect this in similar manner to a t
You need a precise optical or magnetic index marker for one of the recursive quadrature cycles counted to compute phase. Then you need to know torque available and interia on motor to predict when it will stop and what external forces are present with acceptable drift. There are several approaches to feedback using both computed position and sense
Place a coil of wire near an opening of the motor housing. It could pick up some signal. Maybe magnetic field. Maybe sparks, etc. Detect the waveform coming from your coil. To count rotations, you'll probably need to divide by the number of windings in your motor.
You need a foot pedal switch and a three phase magnetic contactor. See the picture What is the voltage system (220V or 110V) at your location ? What are the motor ratings ? (voltage, current, horse-power or kil
magnetic Hall sensors or single chip encoders are suitable with a saw tooth scanning or magnetic pole wheel ( ). Enjoy your design work!
`micro controller at89c51 -dc motor -magnetic sensor -load sensors -automatic door open/close -audio notification -seven segment display -switches-and other component -how to done programming of micro controller -and give a new idea on this project give me a circuit diagram and told how interfacing with micro controller
Hi all, thanks for the reply. I really can't add a stepper motor or more complex A micro stepper motor gives the cogging feel without any circuit due to magnetic poles. The two coils with a quadrature logic and generate the step pulse and direction outputs needed or if you prefer , step CW and CCW. This can
magnetic Core saturation is a function of V/f so this ratio must not be exceeded. In your case V should be 183Vac for 50Hz. If the lower RPM is acceptable, ensure V/f is not exceeded in your transformer selection and accept that you will not get rated HP out due to excess heat from Excitation currents which are much higher than this frequency r
I suppose it should work but like all generators it relies on the magnetic field shifting relative to the coil. If you could move it around the Earths poles 50 or 60 times a second you could be on to something. If you rotate the coil by other means you are only converting that energy to electricity. Brian.
It might work but I would doubt it. What it is trying to explain is: the speed of an AC motor, such as used in the small pumps, isn't proportional to the voltage you connect them to. They work by spinning a fixed magnet in an alternating magnetic field, the speed at which it spins is directly related to the rate at which the current alternates.
The basic system is that if you apply a pulse to a coil, the motor steps 360/64 ~ 5.7 degrees. On removal of the pulse there is a magnetic holding force. The pulse must not be too short or there is not enough power to get the rotar to jump to the next mag, holding position, extending the pulse does increase the magnetic holding force. If the (...)
How many wires are coming out of the motor?. Has got a permanent magnetic field? If the motor has a permanent magnet in it, it will produce a voltage directly in proportion to its speed. If there are no magnets, then it will rely on the actual output current to produce the magnetic field, so loading it with a resistor will (...)
1) A solid state relay rated at 5Amps or more 2) A magnetic relay rated at 5 amps or more, inductive load.
why donot you use a 12v dc motor . i think that would be the easiest way . and if you have to buy one from scratch reverse engineer a cordless drill 12v motor or wiper motor of a car You need electrical power to make magnetic field, to avoid that he use permanent magnets I suppose Neodymium magnets which wil
I had used Servo motor for last two years. Got it from mmy Epson Dot Matrix printer ( 4 pin ) and Western Digital Hard Drive ( 3 Pin ) I burn my ICs as I did not care for Back EMF, the magnetic flex generated inside the motors. I learnt to use Diode ( rectifier ) protection on each pin before connecting with IC. Do you (...)
hello, In industries, it's common to use Solid state relay to drive heaters but power relay to drive AC motor, mainly for safety reason even after power relay you use a Power unit to control the speed.. and a thermal-magnetic tri phases breaker (disjoncteur) , calibrated on 1,2 x times nominal Intensity to protect the motor.
The direction of the motor is due to the interaction of the fixed magnetic field and the magnetic field in the armature (rotating part) which is caused by your current flow. So you reverse the current and the direction of the motor reverses. Frank
Did you use Neodymium magnet for magnetic field? What diameter of alternator and how many poles you have? Standard car alternator is not suitable for this job, alternator rotor need to be with permanent magnets. This conversion can be done.
Noise, EMI (Electro magnetic Interference) etc are all the causes for this. When the motor starts, the noise generated in the power lines resets the microcontroller which is easily prone to such noise, and will start behaving abnormally. You need strict isolation for the microcontroller from all such external interferences. When you say control
You may use different methodes depending on your need and capability. Either optical or magnetic solutions. Here you find different applications: . Enjoy your design work!
Induction motor: "The single coil of a single phase induction motor does not produce a rotating magnetic field, but a pulsating field reaching maximum intensity at 0 degree and 180 electrical." 83164 I understand that splitting the phase using capacitors produces a Rotating magnetic field in order to sustain rotation
BLDC = BrushLess DC motor, its characteristics are totally set up by the internal IC and the magnetic circuit and the physical loading of the fan and the inertia of the rotor. As you have not got these figures to hand, put 24V on it and its typical load, wind the voltage down until it stops. Then put voltage at zero and increase it to see at what
i would think that there are two sets of magnetic circuits in the motor, so its a two pole machine for high speed and four pole for low speed. You can only adjust the speed of these motors by the number of poles or the frequency of the AC. Frank
I wonder what you mean with "magnetic load"?
If the motor has not a build in encoder or zero position sensor the position sensing device needs to be external. If you can put a magnet on the axis you could use a single chip magnetic encoder, like the iC-MA from iC-Haus ( application you find here: , or here:
Hi I am going to build a governor control for hydro electric project. I would like to use PIC micro controller for developing PID logic.The first part of governor consists of frequency control of the hydro electric generator. The frequency sensor is magnetic pickup type. I have seen DC motor speed control project with PID logic using microcontrolle
hello there, regarding the magnetic poles (North, south) of an electric motor. When electricity is applied magnetism comes out from the pole face, towards the rotor to make it rotate. I am just wondering, what about the other side of the pole (face), which is facing the casing or the body of the motor, is there magnetism coming out from (...)
Hello, Speed estimation can be done based on voltage applied to and current through the motor. The EMF generated inside the motor is proportional to RPM and static magnetic field. You can "measure" this EMF based on supply voltage minus voltage due to copper resistance. So you should know the relation between EMF en RPM (measurement or (...)
scan metal detectionheads of loops over an oval shape of motor scan as say 10,000 rpm of detector head beet match system {uses pulse induction {sample rate = 1second / 10,000 loops = 100ms per sample in rt}} for scanning but beat match and active ib for distance tune and scan} ie the sensor loop heads {ferrite} are mounted on a spinning of
WimRFP, There are some concepts of phisics not yet neither well known and explored by scientific comunity. The fact is that vacum energy extraction implies proximity of a star, where nuclear fusion generate magnetic dipoles that are the power supply of those aparatus. engineerpervez1, I buyed a book of this subject, but unnafortunnately,
i want to build a magnetic gyroscope. this video is really interesting, but i don't understand the components involved. YouTube - one magnet no-bearing "magnetic gyroscope" it seems the primary gyroscope is in some type of perpetual motion due to the 'magnetic motor??' next to it. it continue
Hi, I think the speed of a stepper motor is less dependent on the voltage of opeartion rather it should be more dependent on the frequency with which the coils are energized!!! This should be correct as the rotor of a stepper always tries to synchronize with the rotating magnetic field of the stator coil. Asimov
To generate more magnetic fields with same current. -- Amr Ali
in an AC induction motor does the rotor and stator magnetic field have same rotation speed ? ( but rotor is turning at slower speed than the stator rotating field ) can somebody explain why ?
When you switch off H Bridge, current in inductors starts to delay in reverse direction. Thats why you see those reverse clamped diode to prevent MOSFET reverse breakdown. Forgot to mention role of inductor is to create magnetic flux to rotate the rotor not to decay current!!
No, you cannot do that. In a stepper motor the rotating magnetic field is created by switching the voltage to the windings. Without switching there is no rotating magnetic field and hence no movement. At mos the motor will rotate 1 step, if you happen to connect the right winding to the power supply. But be very (...)
One alternative, which may not be superior, is the "magnetic amplifier" principle which was firsts used in German submarines in the 1939-1945 war. All combatants had their submarines powered, while submerged, with batteries. There are a few "ancient" books on the subject that may be found on internet used book sites like or bibliof
hi friend, The difference between ac induction motor & synchronous motor are given bellow. Induction motors use shorted wire loops on a rotating armature and obtain their torque from currents induced in these loops by the changing magnetic field produced in the stator (stationary) coils. (...)
Microchip's AN885 and AN894 are nice articles of various ways of speed controll for BLDC by usin magnetic hall sensors and back EMF AN885, Brushless DC (BLDC) motor Fundamentals AN894, motor Control Sensor Feedback Circuits search the web, they are commonly available.
i want to some induction motor fault data for fault diagnosis research, includeing variable loads, temperature effects, magnetic and mechanical vibrations, and other relevant factors. i konw the motorSIM can simulate the motor fault,but where can i download it ?or who can tell me another software tool.thank
Not sure what you mean with "armature", but take a look at the length of the brushes. If they are not properly seated on the communator you will see
This means there are total n poles in the motor. Poles cannot exist except in pairs, i.e. the total number of poles is an even number. Poles act as sources/sinks of magnetic field, so they must exist in pairs.
Hi.... I've read about "mid-band resonance" that causes the stepper to stall when running at low steping rates. The oscillation may be so strong that the motor has no more torque in certain step frequency ranges and looses completely its position. This is due to the fact that the rotor of the motor, and the changing magnetic field of the (...)
banh; Some of them have a return spring and some do not, they rely on the magnetic field to get a starting point just like you assumed!
If you need only sense motor run , you can use piezo sensor as vibration sensor or magnetic switch sensor near accelerator paddle
I encountered a weird problem in permanent magnetic DC motor control application. I used L6204(from ST) as my H-bridge driver for a 11 watt DC motor. I set up the typical circuit named "Enable Chopping". Using DSP PWM output to drive the H-bridge enable input, I just implemented a simple position feedback and used position error to command a (...)
Hi, I found it attached on Old Yaskawa motor SGM-02B312B. It is Sony made magnetic rotary encoder. Anybody know how this thing work? I only know the principles of optical rotary encoder. How to find the wiring fin out? Any one have any clue? I have ask Yaskawa by mail, but no answer. Thx + rgds Tr2000