Quick Answer: How Do You Choose Torque For A Motor?

Which motor gives higher starting torque?

DC motorsSeries wound DC motors are best for applications that require high startup torque, without the need for speed regulation.

Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage..

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.

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.

Why do electric motors lose torque at high rpm?

The torque reduction occurs because motor impedance increases with frequency increases. A VFD cannot increase the voltage above its supply voltage. This causes the current to decrease as frequency increases, thus decreasing the available torque.

Do electric motors have more torque?

That’s possible because at lower speeds, electric motors deliver more torque than gas engines. “Torque is what you need to get a car going,” says Grace, and with more of it, electrics out-accelerate comparable gas engines.

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.

How is rated 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.

Which motor is used for high starting torque?

DC motorDC motor has high starting torque.In a series motor the same current flows through the armature and the field winding. The torque is therefore proportional to the square of the current.

What determines the torque of an electric motor?

Electric motors operate on three different physical principles: magnetism, electrostatics and piezoelectricity. In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force, and thus a torque on the motor shaft.

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.

What is the starting torque?

Starting torque is the torque transferred by the shaft coupling during run-up (see Start-up process). It is calculated based on the ratio of power (P) to angular velocity (ω) and is represented as a rotational speed function.

Why do electric cars produce more torque?

That’s because the electric motor inside of an EV generates torque in a way that produces the necessary force to get the car moving quicker than its conventional counterpart. While EVs won’t be tearing up the track like a Lamborghini or Ferrari, instant torque gives them great acceleration from a dead stop.

What is better to have torque or horsepower?

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.

Is a higher kV motor better?

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. … A higher turn number means more wire and thus more resistance, resulting in a slower motor. So turns with a lower number means a faster motor.

How is kV brushless motor calculated?

The formula to calculate Kv for a brushed DC motor is to just divide the speed by the generated DC voltage that you measure using your multimeter. Another option for brushless motors is to buy a BL motor tester that will calculate Kv for you. One example of this tester is here, but there are other available out there.

What is pull out torque?

Pull-out torque is the maximum torque that can be delivered without losing steps. It reaches its maximum at the lowest frequency or speed, and decreases as frequency increases. … Pull-in torque is the maximum torque at which a motor can start rotating at a given frequency.

What is rated torque of motor?

Rated torque is the maximum continuous torque available at the design speed that allows the motor to do the work without overheating. Starting torque is the torque the motor delivers at zero speed. i.e. startup. It is also called the stall torque.

How do you calculate starting torque of a motor?

We know that at the start the rotor speed, N is zero. So, the equation of starting torque is easily obtained by simply putting the value of s = 1 in the equation of torque of the three phase induction motor, The starting torque is also known as standstill torque.