How to calculate detent torque. Here is the formula: TH = 1.
How to calculate detent torque. Detent torque is defined as the torque at the maximum load that is applied to the shaft of the motor which is unexcited without causing continuous rotation. This protects against "spring back", an inherent property of torque hinges without a detent. The periodic fluctuation in output torque of a motor is referred to as torque ripple. This now constitutes a practical speed-torque curve. The momentum of the moving rotor is countered by the detent torque, along with friction in the rotating components. But I keep searching for stuff online and there seems to be so many explanations for the motor torque output. Jan 13, 2016 · On the other hand, detent torque can be beneficial when stopping the motor. This torque calculator can calculate the torque (T) value, distance (D) or force (F) by using the same formula (T = F * D) and can support various measurement units. The torque-speed curves for a stepper motor are developed with a specific motor-drive combination, operating voltage, and driving method. Sometimes, this is attributed to the detent torque on permanent magnet and hybrid motors, but in fact, both detent torque and the shape of the torque versus angle curves are products of poorly understood aspects of motor geometry, specifically, the shapes of the teeth on the rotor and stator. The same effect causes a slight decrease in torque with speed in the constant torque region as well. Professionals in the aerospace industry argue that the Magnetic Coulomb Torque (fc or Detent Torque) is a function of position and typically integrates out over a course of a step. Jun 23, 2020 · When information about holding torque or load torque is unavailable, the horsepower of the motor can be used with a general formula to get a ballpark figure for brake requirements. Jun 23, 2020 · Using a General Formula When the Load or Holding Torque is Unknown When information about holding torque or load torque is unavailable, the horsepower of the motor can be used with a general formula to get a ballpark figure for brake requirements. This calculator helps analyze the performance and capabilities of a stepper motor by computing the difference and ratio between these two torques. . In the diagram: S = Side force F = End force (spring force) R = Reaction force A = Countersink angle The reaction force (R) is perpendicular to the contact surface. 15. Here is the formula: TH = 1. Preview: Roller Detent Mechanism Design Calculator Roller Detent Mechanism Design Equations Displacement in the S (vertical) Equation S = ( ( N · tan α ) / 2 ) - R ( ( 1 - cos α ) / ( cos α ) ) Feb 7, 2025 · Detent torque is the torque resisting motion when the motor is not energized. Because detent torque has to be overcome in order for the motor to move, it reduces the ideal torque that the motor can produce when it’s running. In order to calculate the side force, Fs, necessary to disengage a ball plunger from the detent hole you need to know the end force of the ball, FE, the resultant force, FR and the countersink angle. This phenomenon is generally recognized as torque. It causes uneven, jerky motion and velocity ripple. Overcoming the detent torque requires more power from the motor, and the amount of power needed is proportional to speed. According to Intelligent Motor Systems (IMS) holding torque is the maximum force that can be externally applied to a stopped, energized motor without causing the rotor to rotate continuously While the inherent high detent properties of discrete permanent magnets provide desirable unpowered holding performance characteristics, it results in unique behavior especially in low duty cycles. See the diagram below for reference. Mar 26, 2018 · Stepper motors remain popular for industrial motor applications because they are low-cost, rugged, simple, have high torque at startup and low speeds, require little maintenance, and they can operate in an open loop control system. Figure 3 Notice how in Figure 3 the power output decreases with speed because of the constant-torque loss due to detent torque and other losses. By the end of this section, you will be able to understand how torque is calculated and why this is important when selecting a hinge. They seem to only have one figure in specifications for holding torque which, I presume, is while coils are energised. According to Intelligent Motor Systems (IMS) holding torque is the maximum force that can be externally applied to a stopped, energized motor without causing the rotor to rotate continuously How is torque calculated? In this section, you will learn about concepts like moment, why Newtons are favored over Kilogram Force, how to select appropriate torque hinges that accomodate for torque variation and much more. To calculate the side force needed to slide a ball plunger out of its detent hole, refer to the free-body force diagram to the left. Jan 3, 2022 · Holding Torque – amount of torque that the motor produces when it has rated current flowing through the windings but the motor is at rest. Holding Torque Varies With Position The holding torque of a stepper motor is not constant with position but varies as the shaft moves from one full step position to the next. No current is flowing through the windings. Stepper Motor Working Point and Load Angle. Oct 11, 2023 · Holding torque is a measure of how much rotating force is required to force a stationary step motor shaft out of position. When designing motors used to power rotational devices engineers need to understand the engine's sensitivity to force. Detent Torque – amount of torque that the motor produces when it is not energized. 25 x 63,024 x ( (P x K)/ω) Here are the variable definitions: Because detent torque has to be overcome in order for the motor to move, it reduces the ideal torque that the motor can produce when it’s running. This variation is caused by the detent torque which adds and subtracts from the electrically induced torque as the shaft of the motor moves. Roller Detent Mechanism Design Equations and Calculato r This is an example of a roller detent mechanism for linear rack and pinion functions. Detent torque typically ranges from 5 to 20 percent of the motor’s holding torque. Since FR is perpendicular to the contact surface, use the following equation to solve for FS: The recommended approach defines two distinct relationships to calculate the Motorization Ratio for 100 percent duty cycle and partial duty cycle, when the motor detent (unpowered holding torque) is the main contributor to holding position. On the other hand, detent torque will create distortion of the total available torque, which is not desirable when driving in microstep. Holding torque (T) is the product of a motor’s torque constant (KT) and the current (i) applied to the stator windings. Any deviations from the stated motor-drive combination and operating conditions can change the system’s torque-speed characteristics. If someone can equip me with some stepper motor knowledge and maybe share some calculation equations that would be great. Detent torque can be useful to hold position without energizing the motor, which can save on power consumption. What can microstepping really achieve? This tutorial debunks common myths and delivers technical facts for the optimal use of stepper motors. The residual torque in a permanent magnet or hybrid stepping motor is frequently referred to as the cogging torque or detent torque of the motor because a naive observer will frequently guess that there is a detent mechanism of some kind inside the motor. Mar 22, 2016 · The achievement of low and repeatable values of cogging torque probably is the major problem encountered in designing and manufacturing permanent magnet motors. Solving for side force (S): Mar 26, 2023 · I know there are such things as pull-in torque, pull-out torque, detent torque, motor constant, stuff like that. Pull-in Torque Curve – Shows the maximum value of torque at given speeds that the motor can start, stop or reverse in May 31, 2016 · I want to know what torque a stepper motor can hold when stationary. Notably, the running torque reduces quickly to the unpowered holding torque when the duty cycle is reduced. At the end, you will be introduced to While the inherent high detent properties of discrete permanent magnets provide desirable unpowered holding performance characteristics, it results in unique behavior especially in low duty cycles. Therefore, a higher detent torque will help the motor stop more quickly. How is Detent torque hinges are able to hold torque hinges completely closed. In other words, part of the cycle, the Detent Torque is working against the electro-magnetically generated torque, and part of the cycle, the Detent Torque the generated Jul 9, 2024 · In this article, we'll explore the concept of holding torque, its significance, how it compares to detent torque, and its impacts on motor performance, providing a technical yet accessible guide. Jan 9, 2018 · How to Calculate Holding Torque. utducdxketbv0sszna7zisn7zxzqmseay0vhui3ogl