What is the difference between torque control and torque limiting?

Torque limiting control, the method adopted is the saturation of the speed regulator; Torque is given and the speed regulator bypass is used. "Well said, top it! Torque limiting control, when the speed ring has a large speed deviation input signal, the speed ring's PI regulator output"Saturation"。

Then, the output of the velocity regulator in the saturated state is limited, which is the torque limiting. We're always there"Soft connections", torque limiting control is used. In strip production lines, paper machine production lines, acrylic production lines, etc., load distribution between transmission rollers can be considered"Torque limiting control"。

The speed of the driven roller is given the same value as that of the driving roller, and the speed of the driven roller is given by about 2% 5%, and the speed ring of the driven roller will be saturated. The torque of the driving roller is used to control the torque limiting of the driven roller to ensure that the output of the driven roller is not greater than that of the driving roller at any time.

These two are actually the same, but the requirements of the process are different. A torque is often reached to the rated value, and the speed is not yet there. The other torque is less than the limit and the speed is up to the rated value.

However, there is one that is understood. That is, the torque priority level is high, that is, the torque reaches a limit value, regardless of the given value of speed. The torque limit is not reached, and the speed is subject to the speed given.

The definition of torque is the force multiplied by the force arm, and the popular example is that you use your hand and a wrench to tighten the nut of the bolt, and twist the nut of the same size, using a large wrench will save more effort because the force arm is larger.

Three torques, which belong to the three performance indicators of the motor, are briefly described as follows:

1. The maximum torque refers to the torque when the motor can maintain normal operation, which is the maximum load that can be driven, and in fact, there is a performance index of the minimum torque, that is, the minimum load that can be driven. Beyond these performance indicators, the motor will not be able to operate normally, after exceeding the maximum torque, the motor is in danger of burning, and the front spine blind motor after exceeding the minimum torque belongs to the operating condition of large energy consumption and small output.

2. The rated torque refers to the best operating condition under the rated current (which can be understood as the rated power), which is the best working condition of the motor and the highest efficiency.

3. Stalled torque, also known as short-circuit torque, refers to the torque when the rated voltage is applied to the motor, but the motor is forced to rotate by external force, which directly reflects the starting performance of the motor.

Under normal circumstances, the larger the stalled torque, the better, but too large the stalled torque, the starting current will increase at the same time, resulting in an impact on the power grid. Therefore, in the national standard, the minimum limit of the stalled torque, and at the same time the maximum limit of the starting current.

There are three formulas for calculating the torque of a rotating object:

1, m=n (torque equal to power divided by angular velocity).

2, m=j (torque equal to moment of inertia multiplied by angular acceleration) 3, m=fl (torque equal to force multiplied by force distance).

The rated torque of the motor indicates the output of the motor shaft end under the rated conditions. Torque is equal to the product of force and force arm or force couple arm, and in the International System of Units (SI), torque is measured in newton-meters (n m).

In engineering technology, kilograms and meters have also been used as the unit of measurement of torque. The motor shaft end output torque is equal to the mechanical power output of the rotor divided by the mechanical angular velocity of the rotor. The formula for calculating the stalled torque of DC motor tk= .

Torque is the manifestation of torque on rotating machinery.

There are three formulas for calculating the torque of a rotating object:

1, m=n (torque equal to power divided by angular velocity).

2, m=j (torque equal to moment of inertia multiplied by angular acceleration) 3, m=fl (torque equal to force multiplied by force distance).

Torque is a special moment that makes an object rotate. The torque fluid cancellation of an engine is the torque that the engine outputs from the crankshaft end.

Under the condition of fixed power, it is inversely proportional to the engine speed, the faster the speed, the smaller the torque, and vice versa, it reflects the load capacity of the car within a certain range. The external torque is called torque or external force moment, and the internal torque is called internal force moment or torque.

Torque is the work done by the piston for each unit distance of reciprocating motion in the cylinder, and automobile torque is the torque output by the engine from the crankshaft end. Torque is also a reflection of the load capacity of the car, the greater the torque, the greater the load that the car can bear, and the better the performance of the car.

A force that causes an object to rotate or rotate is called torque.

Damn, the wrong people upstairs!

Torque is the force multiplied by the radius of the point of application.

Torque: The product (m) of the force (f) and the arm (l). That is: m=f·l. where l is the vector from the axis of rotation to the force, and f is the vector force.

The dimension of the moment is the distance force; Same dimension as energy. But the moment is usually measured in Newton-meters, not in joules. The unit of moment is determined by the unit of force and force arm.

A physical quantity that forces have a rotational effect on an object. It can be divided into the moment of force to the axis and the moment of force to the point. The moment of force on an axis is the physical quantity that a force uses to produce an action on an object around a certain axis.

It is an algebraic quantity, the magnitude of which is equal to the product of the component of the force in the plane perpendicular to the axis and the vertical distance of the line of action of this component to the axis; Its positive and negative signs are used to distinguish the different turns of the moment, which is determined according to the spiral rule of the right hand: the four fingers of the right hand are along the direction of the force component, and the palm is facing the axis and clenched into a fist, and the direction of the thumb is consistent with the positive direction of the axis. The moment of force to a point is the physical quantity of force that rotates around a certain point on an object.

It is a vector equal to the vector product of the force action point position vector r and the force vector f. For example, an object fixed to point o with a ball hinge is subjected to a force f, and r denotes the position vector from point o to point a of f, and the angle between r and f is a (see figure). The object rotates around the plane perpendicular to R and F and passes through the axis of point O.

The magnitude of the rotational action and the direction of the rotating shaft depend on the moment vector m of f to the point o, m r f ; The magnitude of M is RFSINA and the direction is determined by the right-hand rule. The projection of the moment m on the Cartesian axis of the center of moment o is mx, my, mz. It can be proved that mx, my, and mz are the moments of f to x, y, and z axes.

The dimension of the moment is l2mt -2 and its international unit is n·m.