Which Kind of Dc Motor Has the Poorest Speed Regulation -shunt ,series ,cumulative Compound?

SERIES MOTOR

1. Why can't a superconductor make a DC motor self sustaining?

There are other losses in a motor besides I^2R losses. There are eddy currents in the steel as well as hysteresis losses. There are also losses from friction and wind resistance.

2. DC motor makes noise but does not rotate

For the benefit of anyone reading Jeremy Blum's Exploring Arduino book who is having the same issue- he has labelled the transistor wrong in the book so the collector and emitter are back to front. Turn the transistor around to face the other way and your issue will be resolved

3. If carbon is non-metal, then how do carbon brushes in a DC motor transmit electric current?

Actually carbon brushes of DC motor are made from a weak conductor of electricity, called graphite. It is an allotrope of carbon. This material has a smooth planar lattice arrangement and has a lot of "valence" electrons or free electrons in the lattice. These electrons can move when an electric potential is applied to the sides of a graphite plate.

4. what do you mean by DVI feedback widely used in dc motor speed control?

The term "DVI feedback" appears to be a term that is unique to one particular company. It refers to an isolated armature voltage feedback signal. DVI may mean DC or Digital Voltage Isolated or Isolator. The company web site uses a lot of acronyms and technical jargon but does not provide much clear or easily accessible information. Electronic motor control equipment and other power electronic equipment generally includes some type of galvanic isolation between higher voltage power handling circuits and the lower voltage control circuits. Isolation is required for all command or driver signals and all feedback signals transmitted between the two areas. Isolation is usually provided by opto-isolators or transformers. Either digital or analog signals can be used.

5. In the DC motor, how is the maximum speed determined in the case of no load?

Notes from personal experiments, not from theoretical analysis: Small permanent-magnet motors removed from toys or devices like tape recorders when supplied with rated DC voltage run at a pretty high speed. It seems to be limited by friction and air resistance. They have not self destructed in my experience at rated voltage. Under normal load they run a little slower. If they are given increasingly high voltage, with no load, the windings overheat and smoke, the bearings overheat and seize, and it might fly apart or jam from the centrifugal forces

6. What is the best way to measure the following DC motor parameters?

The torque constant and the back EMF constant will not change with changing voltage. The standard units of measurement should be Newton-Meters / Amp for the torque constant and Volts / Radians per Second for the back EMF constant, but other units could be used, so it is best to have the units stated by the manufacturer.Motor regulation is the speed change resulting from a given load torque change. If the magnetic flux of the field is constant as with a permanent-magnet DC motor with a commutator, the torque vs speed relationship is quite linear from no-load speed to stalled torque.

7. Controlling Stepper or DC motor with L298 or L293 and getting operation similar to Servo for 6 dof arm

You can not do position control without position feedback.You need position feedback. Your comments regarding why you are not going to use position feedback ("cumbersome and inaccurate due to vibration") are totally inaccurate. There is no vibration unless you do not mount the equipment correctly. It's not any more cumbersome than anything else. If you want to do position control, you are going to put a position sensor somewhere.How well you want to do position control, how accurate you want it to be, how long you want the startup/homing routine to be, those are all questions for you the designer to answer. Being lazy now and choosing to slap a limit switch on because you can not be bothered to actually look at rotary encoders means you get to wonder for the life of your robot arm whether the arm is actually in the position you think it is. You can command an incremental position change. You cannot verify the final position

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The reason you see the sparks is because you are open-circuiting a charged inductor (ie the stator of the motor) Thou shall not open-circuit a charged inductor, thou shall not short-circuit a charged capacitor. The stator of the motor has been "charged"... you have at one point applied a voltage to it to permit current to flow. For whatever reason (intent or oversight...) the relay has opened the stator terminals. The inductor MUST keep the current flowing & due to: $V = LfracdIdt$, a sudden (attempted) change in current can only result in an increase in voltage which leads to sparks, avalanche or insulation breakdown. To remove such sparks you could consider using a H-Bridge arrangement but these are more involved. As a "poor mans" replacement, some sort of snubber across the motor would be the next best thing. An R-C-Z would be one option1. reversing DC motor rotation using TWO limit Switches Problem !! need helpNormally you use state machine for this kind of programming: you have a state variable that remembers what you are doing, and depending on the current state you decide what to do next. Below is an example with two states. I have embedded a few assumptions about the wiring of your motor and your switches, which may be wrong, so you have to check the code.This will start in the MOVING_CW state, but you have to actually start the movement in setup(). It has the drawback of having long delay()s in the loop, which is undesirable if you have other tasks to perform. These delays can be removed by "remembering" that you are waiting as two extra states:2. how do i hook a small 12vault dc motor to a battery when it doesnt have any wires ?There is only one motor shown in that link, and that has two solder tabs. (I can see only one, but I am sure there is another one on the other side). So you solder the wires to those two tabs.3. Change Direction of 12v DC Motor Rotation using RelayMaybe something like that could work.Switches are on the two ends and trigger the change of direction of the motor.The relay should be of the 'latching' a.k.a. 'bistable' type.simulate this circuit - Schematic created using CircuitLab4. What if we don't use split ring commutator in a DC motor?Cosider the simplest of motors, one with a single coil of wire within a fixed magnetic field. The split ring commutator is a primitive switch so the that DC electricity goes through the coil one way, and then reverses the current when the armature turns 180 degrees. Without a split ring commutator the current would not reverse when armature reverses, and the magnetic fields of the rotor and stator would clash and the rotor will stick in a position and not turn.5. Wiring DC Motor Controller board to Raspberry Pi 3QuestionPie fired - Why?AnswerThere is 50% chance that the pins 1, 2, 3 labelled below are hardwired to Gnd or Vcc. These pins are used for dry run, without Rpi connected. You use a jumper to short the pair of pins to check out if the motor can move. But if you connect your Rpi GPIO pins to these dry run test pins, Pi fried instantly.You might use a multimeter to measure the voltages at these pins, or give me the link to the motor driver to check out the schematics to confirm6. What kind of DC motor is this and what does the circuit do?That looks like a DC motor of the type used in tape cassette players.For music reproduction with accurate pitch constant motor speed is required. Achieving this in battery powered equipment requires addition of a voltage regulator or speed controller as DC motors' speed varies (nearly linearly) with voltage. The potentiometer in the motor allows the speed to be factory set.I modified one such motor on a good tape deck, adding an external pot and switch to allow some pitch adjustment so that I did not have to keep retuning my guitar between tracks / albums.The TDA1151 seems to be one simple device intended for such applications.7. Battery Specification for using a 1 HP DC Motor?One horsepower is equal to 746 Watts; in reality, however, a 1 hp AC induction motor draws 1500 Watts at 1 hp load. If you use a DC motor, you would connect batteries in series. If you are designing uninterruptable power for an AC motor, the requirements are formidable. First, you need an inverter capable of 1500 Watts comtinuous and 9000 Watts starting surge. Second, at 12 Volts the battery will have to supply 150 Amperes. A back-up supply of this size is not practical as opposed to a standby generator. A suitable inverter will be expensive (if available). The actual battery requirement would be several hundred Ampere Hours of capacity for every 20-30 minutes of operation.
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