Question

What does stepper motor Nm mean? How is stepper motor Nm calculated? What is torque formula calculation? What does a larger stepper motor Newn value mean?

Comments

What is the concept of the torque unit n.m of the stepper motor? How is it different from torque?

---

What is the difference between torque (g.cm), torque (n.m), torque (kg.m) in stepper motor?

Torque, torque and torque are actually the same in stepper motors.

In stepper motors, it refers to the driving "moment" generated by the rotor winding in the stepper motor that can be used to drive mechanical loads. The so-called "moment" refers to the product of the force and the distance perpendicular to the fulcrum and the direction of action of the force.

Answer 1

1. The motor has a common formula, P=MN/9550

P is the rated power, M is the rated torque, N is the rated speed, so please confirm the motor power and rated speed to obtain the rated torque size. Note that the unit of P is KW, the unit of N is R/MIN (RPM), and the unit of M is NM.

Screw closed loop stepper motor

2. Torque and torque are completely a concept, which is the product of force and force arm length, in NM (Newton meters);

For example, a motor output torque of 10nm, at a distance of 1m from the output shaft (force arm length 1m), a force of 10n can be obtained; if it is 10m away from the output shaft (force arm length 10m), only 1n of force can be obtained.

Motor torque selection

Moment of inertia calculation

In rotational motion, the moment of inertia J of an object corresponds to the mass of the object in linear motion. To calculate the dynamic load of the system during acceleration, it is necessary to calculate the moment of inertia J and angular acceleration w of the object, and then derive the moment of inertia T = J*w.

The moment of inertia of an object is: J=∫r²pdV, where dV is the volume element, p is the density of the object, and r is the distance between the volume element and the rotating axis. Unit: Kgm². Take a cylinder as an example:

J=W/8(D/10³)²=πp/32(L/10³)(D/10³)^4, where: L(length/mm)D(diameter/mm)

To convert the load mass to the moment of inertia on the output shaft of the motor, the common transmission mechanism and formula are as follows:

1) Ball screw

J=W（1/2π*BP/10³）²*GL²

W: Total mass of movable part (Kg)

BP: Lead screw pitch (mm)

GL: Reduction ratio

2) Rack and pinion, conveyor belt, chain transmission

J=W（1/2*D/10³）²*GL²

W: Total mass of movable part (Kg)

D: Pinion diameter (mm)

Sprocket diameter(mm)

GL: Reduction ratio

3) Rotating body, turntable drive

J=（J1+W（L/10³）²）*GL²

J1: The moment of inertia of the turntable

W: The mass of the object on the turntable (Kg)

L: Distance from the object to the axis of rotation (mm)

GL: Reduction ratio

4. Acceleration calculation

For the control system to be accurately positioned, the object movement must have an acceleration and deceleration process.

Given the acceleration time △t and maximum speed Vmax, it is easy to calculate the angular acceleration of the motor: w=Vmax/△t(rad/s²)

5. Motor torque calculation

T=(J*w+TL)/n, where: TL is the torque converted from the external force of the system to the motor; n is the efficiency of the drivetrain.

According to the calculated torque T plus a certain safety factor, the model of the motor can be selected.

Answer 2

There are generally two units of torque, torque and torque, that is, kilogram · meter (kg·m) and newton meter (N·m), gram·meter (g·m) is only kilogram·meter (kg·m) thousandths. "1kg force = 9.8N". 1 kg·m (kg·m) = 9.8 Newton·m (N·m).

The torque (g.cm), torque (n.m), and torque (kg.m) in the stepper motor are very important parameters when selecting, and if the selection is not correct, it is basically impossible to cooperate for a long time.

Answer 3

Stepper motor Nm calculation:

Torque in physics is the size of the moment, equal to the product of force and force arm, the international unit is Nm, in addition we can also see kgm, lb-ft and so, because G=mg, when g=9.8, 1kg=9.8N, so 1kgm=9.8Nm, and pound lb-ft is an imperial torque unit, 1lb=0.4536kg; 1ft=0.3048m, you can calculate 1lb-ft=0.13826kgm.