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


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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Shunt DC Motor Controller Improvement
Shunt DC motor controller improvementSo this looks as if the circuit controls armature current?It controls armature voltage.would it be better if the winding current was controlled?Controlling armature current with an outer voltage or speed control loop would be better, but more complex.By "winding current" I suspect you mean field winding current as apposed to armature winding current. Controlling the field winding current would make the minimum operating speed about equivalent to the present maximum speed. Reducing the field current will increase the speed and reduce the torque capability. I doubt very much that is what you want.The above seem to be the only actual questions asked. The question seems to imply that you wish to improve the control scheme because the motor " runs slightly erratically." You have not actually described what aspect of motor performance is undesirable.Speed decrease with increased load is normal for a simple armature voltage control. Random speed variation with a steady load could be due to line voltage variation, other power quality issues, motor brush problems or a loose connection. Failure to start relably would like be a brush problem— — — — — —Can you use an AC switch with a DC motor?Just follow the ratings of the switch. Typically, the DC voltage rating is less than the AC voltage rating. Current ratings are normally the same— — — — — —What is an interpole in a DC motor?Thanks for A2A.Purpose of Interpole in DC MachineFor understanding the role of Interpoles, we need to understand the effect of armature reaction in the DC Machine. The effect of armature mmf on the main field flux is to distort the main field flux and to reduce the net main field flux. The figure below, shows the effect of armature mmf on the main field flux. It is quite clear from the above figure that the flux at the location of Carbon Brush i.e. A, B and A are not zero and therefore an EMF will be induced in the coils undergoing commutation and will lead to the sparking. As we know that for better commutation, the coils short circuited by the brushes should have zero EMF induced in them. As the zero crossing of field flux is shifted due to armature reaction, the coils undergoing the commutation will have a net EMF induced in them. This induced EMF in the short circuited coil will delay the reversal of current in the short circuited coils and will result into poor commutation and sparking at the carbon brushes.The question arises how to resolve this issue?If we see the figure above, we observe that there is a net shift of zero crossing of net flux in the air gap by an angle Ɵ in the direction of rotation for Generator and opposite to the direction of rotation for Motor. So the cheap and easy solution shall be to shift the Carbon Brush at Zero Crossing of the air gap flux.Thus carbon Brush need to be shifted by an angle Ɵ from Geometrical Neutral Axis (GNA) in the direction of rotation for Generator and opposite to the direction of rotation for Motor.But this method of shifting the Carbon brush has a big disadvantage. What is that?As the Armature Reaction depends on the current flowing through the armature winding which in turn depends on the load current. Therefore as the loading of the DC Machine varies the angle Ɵ will also vary and therefore we need to continuously shift the Carbon Brushes. So we need to find a smart way.Again, looking back to the figure, if it could be possible to make the resultant or net air gap flux zero at GNA, then there would not have been any detrimental effect of armature reaction on commutation. Also, the existing flux at the GNA (at point C) is due to North Pole so we could use a South Pole (opposite of the pole which produced the imbalance at C) at C so that the net flux at C becomes Zero. Similarly at C' we can use a North Pole to make net flux Zero there. Okay, this will work fine but how t change the magnitude field strength of this newly installed poles at C and C'? Hmmmm. .We can use a winding on the newly installed poles at C and C' and connect that winding in series with armature winding so that the strength of field due to newly installed poles at C and C' varies proportionally will the loading of machine. Yes, this will work fine.So we can conclude our solution as,We will use Poles same as that of Main Poles ahead of GNA or Carbon Brush for Generator at the location of GNA or Carbon Brush and Poles same as Main Pole that of behind the GNA or carbon Brush for Motor at the location of GNA or Carbon Brush and will use winding on them and connect them in series with the armature winding as shown in figure below.The Poles used in our smart solution is called the Interpole. Interpoles are narrow poles placed at the GNA and fitted to the Yoke and also known as Commutating Poles or Compoles. For generator, the polarity of Interpoles must be same as that of main Pole ahead of it in the direction of rotation. For Motor, the polarity of Interpole must be same as that of Main Pole behind it. So I expect that you understand the purpose of Interpoles as you only designed it. But there is one more interesting role of Interpole.Interpole do not only nullify the effect of armature reaction but in addition, produces some extra mmf in the interpolar zone. This extra mmf in the interpolar zone induces rotational EMF in the short circuited coil undergoing commutation in such a direction to oppose the reactance voltage in the coil. Thus the resultant the resultant voltage in the short circuited coil becomes zero and the commutation is spark less.What is an interpole in a DC motor?
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