What is the holding torque of a stepper motor?

 

Holding torque refers to the maximum torque that a stepper motor can produce when it is stationary or holding a load in a fixed position. It is the amount of torque required to overcome any external resistance or to prevent the motor from rotating under load. Holding torque is typically specified in units of force-distance, such as N·m (Newton meters) or oz·in (ounce-inches).

 

 

 

 

 

 

 

 

Picture from: 24HS34-3504D

 

 

 

 

 

 

 

Significance of Holding Torque:

The holding torque of a stepper motor is a critical parameter that determines its ability to maintain position and resist external forces. It plays a vital role in applications where the motor needs to hold a load without any additional mechanical braking or locking mechanisms. The higher the holding torque, the more capable the motor is at maintaining position and resisting disturbances.

 

 

 

 

 

 

Picture from: 23HS30-2804D

 

 

 

 

 

 

 

Factors Affecting Holding Torque:

Several factors influence the holding torque of a stepper motor, including:

 

Motor Design: The physical design and construction of the motor, including the size, number of poles, and winding configuration, can significantly impact the holding torque.

 

Current and Voltage: The current and voltage supplied to the motor windings affect the magnetic field strength and, consequently, the holding torque. Higher currents generally result in increased torque, but it is essential to stay within the motor's specified limits to avoid overheating or damaging the motor.

 

Rotor Position: The holding torque varies depending on the rotor position, with the maximum holding torque typically achieved when the rotor teeth align with the stator poles.

 

Motor Temperature: Stepper motors may experience a decrease in holding torque as the temperature rises due to increased resistance in the windings. It is crucial to consider the motor's operating temperature and its impact on holding torque during prolonged usage.

 

Application Considerations:

When selecting a stepper motor for a specific application, it is crucial to consider the required holding torque carefully. Factors such as the weight and inertia of the load, external forces, acceleration, and deceleration requirements should be taken into account to ensure that the chosen motor can provide sufficient holding torque to meet the application's demands.