What does detent torque mean?
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.
How is holding torque calculated?
Identify the formula. Holding torque is computed as torque sensitivity x maximum current. Calculate holding torque. Where torque sensitivity is 4.675 Nn/Amp x 10 raised to the power of (-3) and maximum current is 0.35 amps, holding torque is 4.76 x 10 power (-3) x 0.35 which equals 7.93 x 10 power (-3) Nm.
What does detent torque mean on a motor?
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 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. This is because of the difference in design between the variable reluctance motor and the permanent magnet and hybrid motors.
What’s the holding torque and detent torque of the stepper motor?
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. Holding torque is one of the primary benefits that stepper motors offer versus servo motors and makes steppers a good choice for cases where a load needs to be held in place.
How is the periodicity of detent torque determined?
It is also known as detent or ‘no-current’ torque. This torque is position dependent and its periodicity per revolution depends on the number of magnetic poles and the number of teeth on the stator.