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#### Elephant Racing • Horsepower and Torque: Which one should

To review we know that a) axle torque converted to linear force accelerates the car b) for a given gear the acceleration will be greatest at the engine torque peak and has nothing to do with RPM or speed c) horsepower is a calculated function of torque and RPM.

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Chat Online#### Torque relationship to speed in a DC motor Electrical

And this increase in speed will require some more torque to accelerate but after it reaches its new speed, the torque will back off to its original torque (unless, of course, the load is dependent on speed

Conceptually, you have to think about this slightly differently. The way I think you are thinking about this is kind of like torque in a vehicle. A car with more torque is going to accelerate more quickly and is associated with an increase in speed. In other words, you press on the gas pedal to increase the speed and you need torque to do that. However, when you are talking about the relationship between speed and torque of a DC motor, then you have to think about it differently. For a given motor with a constant input voltage, the speed of the motor is going to be determined by the load on the motor shaft. For a given load, the only way to increase the speed is to increase the voltage. And this increase in speed will require some more torque to accelerate but after it reaches its new speed, the torque will back off to its original torque (unless, of course, the load is dependent on speed like in a fan). So maybe a better way for you to think about it is instead of saying "Torque and speed in a DC motor are said to be inversely proportional" you say " For a given voltage, torque and speed in a DC motor are said to be inversely proportional." A speedtorque curve that you see on data sheets is only valid for the rated voltage and the motor will operate on that curve. So if torque goes up, the speed will follow that curve and go down.Best answer · 10simulate this circuit – Schematic created using CircuitLab This is a steadystate approximation of a dc motor that works fairly well with some types of dc motors(see comment by super). Since steadystate, the armature inductance $L_a$ is neglected. We have the following:$$begin{align}V &= text{input dc voltage}R_a &= text{armature resistance}E_b &=text{backe.m.f}omega &= text{angular rotational frequency of shaft} =frac{2pi cdot text{speed}}{60}I_a &= text{armature current}K_e &= text{backe.m.f constant}K_T &= text{torque constant}T &= text{shaft torque}end{align}$$and the following equations apply:$$begin{align}E_b &=K_e cdot omega (1) T &= K_Tcdot I_a (2) E_b &= VI_a R_a (3) (text{obtained from equivalent circuit shown})text{from the above 3 equations,} T&=frac{K_T V}{R_a}frac{K_e K_T omega}{R_a}end{align}$$ The equation relating torque and speed(or frequency) is graphed below, clearly showing torque is inversely proportional to speed:2For a constant power delivered to the mechanical load torque and speed multiplied together is a constant. That's the basic definition of power ie Power =$2pi n T$ where n is revs per second and T is torque. An increase in torque (and by torque increase I mean the angular force produced when the mechanical load increases) naturally produces a slowing down of the armature if power in is constant. However, "dc motor" could mean anything and quite a few motors will have field windings that exhibit "constant power" type effects whilst others (with different field windings) will work as constant speed regulators and thus for an increase in torque (due to the load), the speed stays almost constant. Other type of dc motors can have electronic controllers that do the same they sense the current and as it rises, they increase the dc voltage to the armature and this can achieve near constant speed. I think you are confusing real torque with the ability (or potential) to deliver real torque. Without a mechanical load torque is meaningless except for the mechanical losses in the motor.1The general rule of thumb with brushed DC machines is Current ~= Torque Voltage ~= (angular) Velocity (to be fair almost all machines kind of follow this as well but it becomes less and less proportional and more "in some way related" eg freq) You have two constants (kind of constants) when it comes to electrical machines Kt & Ke Ke is the openterminal voltage constant with units: Volts/w. This produces a BackEMF Kt is the torque constant with units: Nm/A in theory Ke == Kt, but Kt is effected by iron characteristics (hence why two exist). The Reason that Torque and Speed are said to be inversely proportional is the ability to generate torque diminishes with increase speed. The reason for this is because the BackEMF opposes the supply that is attempting to force current into the stator, that will generate EMTorque. You are right that for a certain appliion of Torque a certain amount of acceleration will be generated based upon the rotor inertia and load inertia, BUT this torque will be reduced with increased speed as well (windage, bearings etc). So between a diminishing ability to force current into a machine at increase speed as well as increased losses at higher speed the rate of acceleration will diminish until finally noloadspeed is reached (or some loaded speed when compared to the load torque and the generated torque)0I agree that increase in torque will definitely increase the angular acceleration, But it does not mean that speed will always increase by increasing torque or acceleration, For increasing speed torque should be positive( in direction of angular velocity), not necessary increasing . suppose angular Velocity = + 50 rad/sec Eg1: torque1 = +5 Nm, torque2 = +10 speed increasing both cases .Eg2: torque1 =+5 Nm, torque2 = +3 speed is still increasing even after decreasing torque but definitely with a lesser rate . Eg3: torque1 = 5 Nm, torque2 = 10 speed decreasing both cases .Eg4: torque1 =5 Nm, torque2 = 3 speed is still decreasing even after increasing torque but definitely with a lesser rate . In all examples angular velocity is assuming to be positive . So I think you have doubt is in basic dynamics not in machine.0Any answer which seems to deny acceleration is proportional to torque or that power is not proportional to speed is just nonsense. There are answers here that seem to deny that but which are dressed up in sophistied (=false wisdom) language. So let's be plain. If you increase the torque you increase the speed UNLESS you increase the load. The important thing to remember is that with electric motors there is a backEMF (a motor is a generator too) which increases with speed and that limits the effective voltage and thereby the current and thereby the torque. But more torque? More speed. Ref Isaac Newton.0The way i think is, as for steady state operation load torque must be equal to motor torque, now if load is increased for dc motor (shunt), current will increase. Now in other way you can say if current drawn increases motor torque increases. Now as load increase, the motor speed will decrease and will stable at a speed lower then previous value, and hence you can say as load increase, current drawn increases but speed decreases. So you can conclude, as load(load torque) increases→motor torque increases but at the same time speed decreases as load torque is becoming more than motor torque.0Chat Online#### torque caracteristic of ball mill mowasahhospital

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