What is meant by detent torque?

What is meant by detent torque?

Stated another way, detent torque is the amount of torque the motor produces when the windings are not energized. The effect of detent torque can be felt when moving the motor shaft by hand, in the form of torque pulsations or cogging.

How is detent torque measured?

Detent torque is calculated as the differential of the magnetic coenergy with respect to rotor angular position at constant rotor excitation. Validation of the detent torque equation is performed by comparing results obtained from the proposed method with laboratory test results.

What causes detent torque?

The detent torque exists because of the residual magnetism in the permanent magnetic material used for the construction of the rotor of the motor. It is produced when the stator coils are not energized. This torque prevents the rotor from drifting when the motor supply is turned off.

What is mean by holding torque?

Holding torque is a measurement of how much rotating force is required to force a stationary stepper motor shaft out of position. Holding torque (T) is the product of a motor’s torque constant (KT) and the current (i) applied to the stator windings.

What does detent mean?

Definition of detent : a device (such as a catch, dog, or spring-operated ball) for positioning and holding one mechanical part in relation to another in a manner such that the device can be released by force applied to one of the parts.

Are stepper motors High torque?

Although stepper motors aren’t notable for their ability to produce high torque at high speed, it is possible, in some applications, to achieve both. The motor’s pull-out torque curve shows the maximum torque that can be produced over the range of operating speeds.

Which of the following motors provide detent torque?

In two stepper motors, the permanent magnet and the hybrid, both produce detent torque, but the variable reluctance stepper motor does not. This is because of the difference in design between the variable reluctance motor and the permanent magnet and hybrid motors.

What is a magnetic detent?

A detent is a mechanical or magnetic means to resist or arrest the rotation of a wheel, axle, or spindle. Such a device can be anything ranging from a simple metal pin to a machine. The term is also used for the method involved. Magnetic detents are most often used to divide a shaft rotation into discrete increments.

What is the difference between holding and detent torque?

So Holding torque is the most important specification of the stepper motor. When someone says torque for a stepper motor but not appointed, usually it means holding torque. Detent torque: A stepper motor’s detent torque is the amount of torque the motor produces when the windings are not energized.

Is stall torque the max torque?

Starting torque is the maximum torque that can be produced by a motor in order to start rotational movement of the load. Stall torque is the maximum torque that can be applied to the shaft and cause the motor to stop rotating.

What does the term detent imply?

A detent is a mechanical or magnetic means to resist or arrest the rotation of a wheel, axle, or spindle. Such a device can be anything ranging from a simple metal pin to a machine. The term is also used for the method involved.

What does detent torque do to a motor?

Detent torque is the amount of torque (the measured ability of a rotating element, as of a gear or shaft, to overcome turning resistance), that must be applied to overcome the static equilibrium of the motor when it is in an state of rest and unpowered. The effect is torque pulsations, known as cogging, when the motor shaft is moved by hand.

How much detent torque does a permanent magnet have?

It usually averages between 5 to 20% of the holding torque. In two stepper motors, the permanent magnet and the hybrid, both produce detent torque, but the variable reluctance stepper motor does not.

What does a detent on a wheel mean?

A detent is a device used to mechanically resist or arrest the rotation of a wheel, axle, or spindle. Such a device can be anything ranging from a simple metal pin to a machine. The term is also used for the method involved.

What does holding torque mean on a stepper motor?

Holding torque. A stepper motor’s holding torque is the amount of torque needed in order to move the motor one full step when the windings are energized but the rotor is stationary.