What is holding torque of a stepper motor?

If external force is applied to a stepping motor when it is stopped but energized, the attractive force generated between the rotor and stator works to maintain the stop position of the motor. This torque of withstanding the external force is called the holding torque.

How do you pick a torque on a stepper motor?

Second, determine the application supply voltage. Then select a stepper with at least twice as much torque as required at the target operating speed, and use a motor rated at about ¼ supply voltage. Next, look at the driver current required to get target motor torque. Select a stepper driver based on that number.

How much torque can a stepper motor generate?

For example, a conventional size 34 stepper motor can produce 5.9 N-m of holding torque. The ultra-high-torque version of the same motor produces up to 9 N-m of holding torque. For a conventional motor to achieve this same torque rating would require a 31% longer motor.

Can stepper motor holding torque?

One feature of stepper motors that differentiates them from other motor types — particularly servo motors — is that they exhibit holding torque. This means that when the windings are energized but the rotor is stationary, the motor can hold the load in place.

Why do stepper motors have high torque?

Why do stepper motors have trouble producing high torque at high speeds? For a given stepper motor design, torque production is primarily a function of current through the motor windings — the higher the current, the more torque the motor produces.

How fast can stepper motors go?

approximately 1000rpm
Generally speaking the top speed of a stepper motor is approximately 1000rpm. The exact speeds that are possible depend on the specific motor being used and the controller being used with it.

When the motor speed of the stepper motor increases the torque will?

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.

Is higher torque holding better?

The amount of power the motor needs to produce to overcome the detent torque is proportional to the motor’s speed. 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.

How do stepper motors fail?

One of the major problems with a stepper motor is complete motor failure. This problem is caused by excessive current being sent to the device by the power supply. A short circuit in the wiring from the power supply to the motor cause this problem with the stepper motor. Some application will cause this short circuit.

Do stepper motors need drivers?

A Stepper Motor Driver is the driver circuit that enables the stepper motor to function the way it does. For example, stepper motors require sufficient and controlled energy for phases in a precise sequence. Due to this, stepper motors are considered more advanced than the typical DC motor.

What’s the maximum speed I can get with a stepper motor?

Generally speaking the top speed of a stepper motor is approximately 1000rpm. The exact speeds that are possible depend on the specific motor being used and the controller being used with it.

How accurate is a stepper motor?

Precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 to 5% of a step and this error is non-cumulative from one step to the next. Excellent response to starting/stopping/reversing. Very reliable since there are no contact brushes in the motor.

How fast can stepper motors turn?

Modern stepper motors can reach rotation speeds of up to 1500 RPM, taking into consideration that the motor torque curve decreases considerably with the increasing of the step frequency.

What is the purpose of a stepper motor?

A stepper motor is an electrical device which divides the full rotation of the motor into individual parts called steps. Generally, these motors are brushless in order to facilitate a synchronous rotation and operate without the input of an external source on the gear itself.