Is There Any DC Motor Produces 7000 RPM and 100 HP,if so then What Will Be the Input Volt and Wattag

100Hp means about 74kW.AT 12V, it will be a huge 6166 amps. Surely you require a train, not a car

1. (How) does blocking a (servo/DC) motor break it? [duplicate]

An increased torque causes an increased current to flow: -With no torque you get the no-load current and maximum speed. With full stalling torque you get a stalled rotor and maximum current.Either end produces zero mechanical output so all the electrical power taken is burnt in the motor.Clearly, with a constant voltage applied, the power burnt is very much smaller when the rotor produces no electrical torque than when the rotor is stalled. This is because the current is much smaller. Hence the motor gets hotter when stalled.if you power an electric motor while blocking it, and thus stopping it from moving, you will damage it.Yes, this can happen and for the above reason.Is the "damaging process" any different in servos, or do they get damaged in the same way?If you mean a servo like this: -Then, it is less likely to be a problem because the servo amplifier will current limit at a more reasonable value (most cheap RC servos etc.) just to protect itself. But you cannot generally rule it out.Could this be prevented by simple measures? (Like putting a resistor in front of it.)Using a resistor is possible but it limits the current at a vital point - when the motor is beginning to rotate from a rest position. The current taken should be the stall current and, in normal operation this lasts for a few hundred milli seconds for a small motor but, if you put a resistor in series, full stall current (and hence full stall torque) is not available and the motor will take longer to accelerate to normal running. In a servo motor this can be crucial - response times are extended and this might impart sluggish behavior to the thing that is being controlled.Active current limit circuits could be used that allow for brief periods of full stall current but then start to reduce current if the period lasts too long. But, now you are into a level of sophistication that may not work in some applications. For instance, if the motor is stalled and the current backed-off, what do you do when the demand signal changes - do you instantly restore full current and make the stall situation just as it was when not using such a control method?

2. How can I get the viscous coefficient of friction B for a DC motor?

The 'Mechanic' block stands for the mechanical part of the system, which is described by the Newton's second law for rotation: $$ Jdot omega=tau, $$ where tau is the overall torque. If we split it into the torque of viscous friction and the external torque, we get $$ Jdot omega=tau_ext-B omega $$ or $$ Jdot omegaB omega=tau_ext, $$ where B is a viscous damping coefficient. Computing the Laplace transforms gives us $$ (JsB)Omega= T_ext $$ or $$ Omega=frac1JsB T_ext. $$ Thus, B from the 'mechanic' block is nothing but a viscous damping coefficient.

3. If I need to lower the Rotation speed of a DC motor, but can't change the voltage what is the eaisest way?

Your potentiometer was too small for the load

4. Can you use a dc motor controller?

No way DC and AC wont work together!!!

5. What does an armature field diverter mean for a series DC motor?

It is used to control the speed of dc series motor. Here the field flux can be reduced by shunting a portion of motor current around the series field. Lesser the diverter resistance less is the field current,field flux. Since speed is inversely proportional to flux,therefore speed increases. This method gives speed above the normal.What does an armature field diverter mean for a series DC motor?.

6. DC motor starting 250W 24V?

A 250 watt motor will be drawing just over 10 amps at 24 volts. Most of the resistance of the motor is due to the induction of the motor. The conductors in a motor do not offer much resistance in themselves. When running the induction is higher than when it's stopped. I am not at all sure it's drawing significantly less current at 12 volts when starting than at 24 volts and the lower voltage may cause the motor to take more time in starting causing more wear and tear than starting with the correct voltage. The main point of wear in this motor would be the brushes themselves. They should last a reasonable amount of time and are normally easily replaceable as long as the motor is not hard to get at. You may not be gaining much if anything by doing this

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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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