# What Is Motor Commutation?

## What is a commutation of a sentence?

A commutation of sentence reduces a sentence, either totally or partially, according to the Department of Justice’s Office of the Pardon Attorney.

A commutation can also release a person from a fine imposed at sentencing – at least the part of the fine that has not already been paid..

## What is back EMF in BLDC motor?

When the same thing happens in a brushless DC motor (BLDC) as a result of motor torque, the EMF produced is known as “back EMF.” It is so called because this EMF that is induced in the motor opposes the EMF of the generator.

## What is the purpose of commutation in a motor?

On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.

## What is commutation in BLDC motor?

Put simply, commutation is the process of switching the current in the motor phases to generate motion. Brushed motors have physical brushes to achieve this process twice per rotation, while BLDC motors do not, hence the name. Due to the nature of their design, they can have any number of pole pairs for commutation.

## What is sinusoidal commutation?

Sinusoidal commutation eliminates the torque ripple inherent to trapezoidal commutation and provides smooth motion and precise motor control. … Based on the rotor position, two sinusoidal waveforms are created, 120 degrees phase shifted from each other.

## What do commuted mean?

verb (used with object), com·mut·ed, com·mut·ing. to change (a prison sentence or other penalty) to a less severe one: The death sentence was commuted to life imprisonment. to exchange for another or for something else; give and take reciprocally; interchange. to change: to commute base metal into gold.

## What do you mean by commutation of pension?

Commutation is defined as giving up part or all of the pension payable from retirement in exchange for an immediate lump sum. Commutation factors (usually calculated by the Scheme Actuary) are used to determine the amount of pension which needs to be given up in order to provide the lump sum.

## What is meant by commutation?

noun. the act of substituting one thing for another; substitution; exchange. the changing of a prison sentence or other penalty to another less severe. the act of commuting, as to and from a place of work. the substitution of one kind of payment for another.

## How can I improve my commutation?

Methods of Improving CommutationResistance Commutation.Voltage Commutation.Brush Shift.Commutating Poles or Interpoles.Compensating Windings.

## What is ideal commutation?

(also called straight-line commutation) is that in which the current of the commutating coils changes linearly from + to in the commutation period as shown in Fig. 7.15. The figure also shows delayed commutation and the current in the spark.

## Why is BLDC trapezoidal back EMF?

We have seen that the principle of the BLDC motor is, at all times, to energize the phase pair which can produce the highest torque. To optimize this effect the Back EMF shape is trapezoidal. The combination of a DC current with a trapezoidal Back EMF makes it theoretically possible to produce a constant torque.

## Is brushless DC a 3 phase motor?

Because the rotating magnetic field generated by the stator causes the rotor to revolve at the same frequency, a BLDC motor is known as a “synchronous” type. BLDC motors can come in one-, two-, or three-phase. Three-phase BLDC motors are the most common and will be the subject of the rest of this article.