What Is Torque Pulsation

The method indicates that torque fluctuations are due mainly to the interaction of fundamental flux in the air gap at harmonic rotor currents.

What is pulsating torque?

They do however suffer from effects of pulsating torque, which is defined in literature as the sum of different perturbations [2]: The cogging torque—generated by the interaction between the PM of the rotor and the stator slots. It results from the varying air gap reluctance due to the slot positioning.

What is torque ripple in induction motor?

Torque ripple is an effect seen in many electric motor designs, referring to a periodic increase or decrease in output torque as the motor shaft rotates. It is measured as the difference in maximum and minimum torque over one complete revolution, generally expressed as a percentage.

Which of the following affects torque ripple?

The frequency of the torque ripple is proportional to the motor’s shaft speed. At high motor speeds, the inertia of the motor and the load can smooth out the effects of torque ripple. And at low motor speeds, high-frequency torque ripple can be filtered out using feedback and parameters in the motor controller.

What is drive torque?

Torque is a twisting force that speaks to the engine’s rotational force and measures how much of that twisting force is available when an engine exerts itself. This applies torque, or a twisting force, to the bolt. While horsepower is simply measured in horsepower, torque is typically measured in pounds feet (lb.

What do you mean by pulsating?

intransitive verb. 1 : to throb or move rhythmically : vibrate. 2 : to exhibit a pulse or pulsation : beat. Synonyms Example Sentences Learn More About pulsate.

Why is torque ripple bad?

Torque ripples have bad effects on the synchronous motors if they cause speed oscillations which contradict with the advantage of the synchronous motors being have constant speed applications. Induction motors may suffer from torsional oscillations due to these torque ripples.

What causes cogging torque?

Cogging torque of electrical motors is the torque due to the interaction between the permanent magnets of the rotor and the stator slots of a permanent magnet machine. It is also known as detent or no-current torque.

How do you reduce cogging torque?

The most effective way to reduce cogging torque is skewing of stator slots or rotor poles. It means skewing of one side of stator (rotor) core by few degrees in according to the other side of core (Fig. 7). The skewing allows to eliminate the cogging torque or to reduce it to minimum.

What are the effects of torque?

Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. Torque is a vector quantity. The direction of the torque vector depends on the direction of the force on the axis.

What is torque ripple in Pmsm?

Abstract: Permanent magnet synchronous motor (PMSM) has been widely used with the characteristic of high torque at low speed. For torque ripple reduction, a rotation coordinate system of the motor model is established, and then the factors that cause torque ripple and the characteristic of torque ripple are analyzed.

Which motor is brushless?

There are two types of commonly used DC motors: Brushed motors, and brushless motors (or BLDC motors). As their names imply, DC brushed motors have brushes, which are used to commutate the motor to cause it to spin. Brushless motors replace the mechanical commutation function with electronic control.

How do I calculate torque?

A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.

Is more torque better in a car?

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.

Does higher torque mean faster acceleration?

A car with more hp than torque will always be quicker since this gives a car acceleration and speed. This is why low-end torque becomes important for better acceleration in many scenarios. Higher torque doesn’t mean one vehicle will necessarily be faster than another, though.

What is a synonym for pulsating?

palpitating, pit-a-patting, pitter-pattering, pulsing, throbbing.

What does it mean pulsating pain?

Pain and a pulsing sensation can mean nerve pain like with a toothache or a pinched nerve in your back. If you have very bad belly or back pain and feel a pulsing inside your stomach, it could be an aneurysm that is bursting. Call 911 if that happens.

How does switched reluctance motor work?

The working principle of the switched reluctance motor is, it works on the principle of variable reluctance that means, the rotor of this motor constantly tries to align through the lowest reluctance lane. The formation of the rotary magnetic field can be done using the circuit of power electronics switching.

Is cogging torque bad?

COGGING torque is defined as the attraction/interaction of the magnetic poles (typically on the rotor) to the steel teeth (typically on the stator lamination) within an un-energized motor. Cogging is a “bad thing”; if the machine will not rotate, it is of no use for a process.

What is the effect of cogging torque?

The effect of cogging torque decreases the accuracy of the motor positioning at low speed, produces additional friction resistance, and to some extent, reduces the output power if the axial flux machine is applied as an electrical generator [8,9,10].

How do you calculate cogging torque?

The cogging torque is calculated by assuming that the flux density distribution on the side of the tooth is the same as the flux density calculated at the stator bore radius at the slot opening and multiplied by the relative permeance of the assumed circular flux path.