What is the holding torque of a stepper motor?

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. In most applications, electronic drivers control stepper motors.

How can you increase the holding torque of a stepper motor?

There are some other things you can do.

1. Use big fat power resistors to reduce the L/R time constant of the motor windings.
2. Use a bilevel supply so the coil sees about 40V when a phase turns on and a much lower voltage when the current in the coil approaches say 90\% of the holding current.

How do you calculate holding torque?

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.

Is higher torque holding better?

The momentum of the moving rotor is countered by the detent torque, along with friction in the rotating components. Therefore, a higher detent torque will help the motor stop more quickly. Detent torque typically ranges from 5 to 20 percent of the motor’s holding torque.

Is holding torque the same as stall torque?

Both holding torque for a stepper motor, and stall torque for a servo motor, refer to the maximum amount of torque when the shaft is not spinning and the windings are fully energized.

When motor speed of stepper motor increase the torque will be?

At higher speed increases, torque output from stepper motors diminishes. No wonder then that most stepper motors aren’t recommended for continuous running at high speeds under such conditions. One solution is to increase supply voltage … but respect the system voltage-supply limits and the dangers of overcurrent.

Does microstepping reduce torque?

The real compromise is that as you increase the number of microsteps per full step, the incremental torque per microstep drops off drastically. Significant too is that any load torque will result in a magnetic backlash, displacing the rotor from the intended position until sufficient torque is generated.

How do you calculate holding torque of a motor?

Load torque is very simple. As you see this equation torque is the product of the force and the distance between the force and the center of rotation. For example, if you want to hold the force acting on the end of pulley, T = F x r.

What is holding torque and detent torque?

The torque which is caused by the motor when the rated current flow across the winding is known as the holding torque. Detent torque is beneficial for stopping the motor. It also resists the momentum of the moving rotor and the friction in the rotating components.

What is maximum holding torque?

Holding torque is typically higher than running torque, and is limited primarily by the maximum current the motor can withstand. From a practical standpoint, holding torque is the sum of the magnetic force exerted by the coils to hold the motor’s current position, plus the detent torque.