How Is Brushless Motor Torque Calculated?

What is a good amount of torque in a car?

100 to 400 lb.-ftEngines in mainstream cars and trucks typically generate 100 to 400 lb.

-ft of torque.

That torque is created by the pistons within an engine as they reciprocate up and down on the engine’s crankshaft, causing it to rotate (or twist), continuously..

How do I get low end torque?

How to Increase Low End Torque?Change the flowing exhausts and intake systems. Replace these components with a new one if you find any damage. … Install some high-quality spark plugs. … Replace the ignition lead with a better one. … Retune the air/fuel ratio (AFR) and the ignition timing maps.Apr 23, 2018

How efficient are brushless motors?

Brushless motors are typically 85-90% efficient whereas brushed DC motors are around 75-80% efficient. This difference in efficiency means that more of the total power used by the motor is being turned into rotational force and less is being lost as heat.

Which is better torque at low rpm or torque at high rpm?

Running at lower RPMs equates to higher torque and thus lower horsepower, while making higher RPM power outputs less torque and higher top horsepower.

Does lower KV mean more torque?

Torque is determined by the number of winds on the armature and the strength of the magnets. A low Kv motor has more winds of thinner wire—it will carry more volts at fewer amps, produce higher torque, and swing a bigger prop.

How do I know what RPM My brushless motor is?

To estimate the RPM of a motor, simply multiply the Kv value by the battery voltage. Kv is in units of RPM/Volt.

How do you calculate torque needed to move a car?

The required tractive torque of the motor shall be equal to the tractive torque at wheel, Tw = Ft. rw , (i.e. Tractive Torque = Tractive Force x mean wheel radius). So you must determine the acceleration required to reach you designed speed.

How is brushless motor power calculated?

Identify the maximum power (BHP) of the motor. Divide this by 1.5 i.e. 2/3s and multiply by 750 to convert the BHP to watts to determine the output power of the equivalent brushless electric motor.

How is torque constant calculated?

The Torque Constant defines the torque-current relationship of a motor and is in Nm/amp. The motor and torque constants are related by the formula Km = Kt(trap)/sqrt(R), where R is the phase-to-phase resistance of the winding.

How do you increase engine torque?

To increase the torque … that a bit harder. All you can do, electrically (as you can do it mechanically via gears), is to reduce the source impedance to maximise the current that can be delivered for a given stator impedance. Rewind it with more turns of thinner wire.

Is HP better than torque?

Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.

How do you increase the torque of a DC motor?

If you want to adjust the output torque within the rated torque range, you can usually adjust the input voltage or the amount of excitation current. If the DC motor has been set, the torque can only be increased by the speed reducer, which can be multiplied or even increased by a thousand times.

How do I choose a BLDC motor?

The key to rating a BLDC motor is torque. This particular design is rated at 6.9 inch-pounds of torque and like all brushless DC motors, the maximum torque rating is independent of speed. The only limitation is that when the speed is lower than 300 rpm, cogging may occur with the motor.

How much torque does a 1 hp motor have?

The 3600 RPM, 1HP motor produces 1.5 ft. lbs. of torque at 3600 RPM. So if your 1HP pump was operating at 1800 RPM, the 1800 RPM motor would be producing 3 ft.

What Kv motor is faster?

Well, it is related to the power out from a motor. Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor.

How do you increase torque?

How You Can Increase Horsepower and Torque?Clean House to Increase Horsepower. … Perform a Tune-Up on the Engine. … Install a Turbo Kit or Supercharger. … Install a Cold-Air Intake. … Install an Aftermarket Exhaust System. … Buy an Engine Tuner. … Conclusion.Mar 16, 2018

Why does torque drop at high rpm?

At high RPM, torque drops off primarily from intake and exhaust flow restriction. Volumetric Efficiency declines because the engine can’t breathe any faster. Mechanical efficiency also declines at higher RPM, due to increased frictional resistance. This further reduces torque at the output.

Are DC motors constant torque?

DC motors can develop a constant torque over a wide speed range. For a DC motor : Torque is proportional to armature current – this means controlling torque requires simply controlling the motor DC current – easily achieved with a simple DC drive.

How is motor torque calculated?

Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.

How do you calculate KV torque?

Therefore, the torque a motor produces is τ=KtI. The SI unit of Kt is the weber. So a lower Kv implies a higher Kt; a higher Kt means the motor will produce more torque from a given amount of current.

Does more torque mean faster acceleration?

A car with more hp than torque will always be quicker since this gives a car acceleration and speed. … Higher torque doesn’t mean one vehicle will necessarily be faster than another, though. For example, a Ford F-250 makes 925 lb-ft of torque, while a Honda S2000 has just 162 lb-ft.