What is the load torque characteristic of production machinery? What are the types? What are the cha

1. Constant torque load characteristics.

The so-called constant torque load means that the size of the load torque of the production machinery does not change with the speed n, and this characteristic is called the constant torque load characteristic. According to the direction characteristics of the load torque, it can be divided into two types: resistance and potential load.

2. Constant power load characteristics.

When the load power is constant and independent of the speed, or the load power PL is a certain value, the load characteristic that the load torque tl is inversely proportional to the speed n is called the constant power load.

The constant power load is characterized by the torque required by the spindle of the machine tool and the rolling mill, the paper machine, the coiler and the uncoiler in the plastic film production line, which is roughly inversely proportional to the speed, which is the so-called constant power load. The constant power nature of the load should be in terms of a certain range of speed variations. When the speed is very low, the torque cannot be increased indefinitely due to the limitation of mechanical strength, and it is transformed into a constant torque property at low speed.

3. Load characteristics of ventilation models.

The directional characteristics of the load of the ventilation model are that it belongs to the resistance load; The size is characterized by the fact that the size of the load torque is proportional to the square of the speed n. Common such loads as fans, water pumps, oil pumps, etc.

It should be pointed out that the above three types are typical load characteristics, and the load characteristics of actual production machinery are often similar or combined with several types of loads. For example, when the crane lifts a heavy load, in addition to the potential load torque, the motor must also overcome the resistance load torque caused by the mechanical friction of the system, so the load torque on the motor shaft should be the sum of the above two torques.

The relationship between the rotational speed n and the load torque tl of the production machinery n = f (tl ) characteristic. Constant torque load: It is characterized by a constant torque size; Constant Power Load:

It is characterized by a constant load power; Ventilation load: It is characterized by the fact that the torque is proportional to the square of the speed.

Motor torque is the output torque of the motor, also known as motor torque, which is related to the output power of the motor. The greater the power of the simple motor, the greater the torque, and the increase of the reducer is related to the reduction ratio, and the larger the reduction ratio, the greater the torque.

The output torque of the motor is related to speed and power, and is inversely proportional to the speed Power is proportional But there are constant power and constant torque motors: p=m*n 9550 m is the torque n is the speed Motor efficiency refers to the ratio of the output power of the motor to the active power.

That is to say, one of the three variables must be determined in order to be proportional.

On the working curve section of the motor, the magnitude of the torque is directly proportional to the power of the motor and inversely proportional to the speed of the motor.

(1) It is proportional to the square of the voltage. According to the rotational principle, the electromagnetic torque is proportional to the magnetic flux and rotor induced current at each pole, which in turn is proportional to the voltage. Therefore, the torque is proportional to the square of the supply voltage.

Therefore, the drop in the supply voltage has the greatest impact on the starting performance of the motor. For example, if the power supply voltage drops to 80%, the starting torque is only the original (80%)2, which is 64% of the original starting torque, so it is particularly difficult to start the motor at low voltages.

2) It is related to the leakage reactance of the motor. The leakage reactance (generated by the leakage flux) is large, and the starting torque is small; Conversely, decreasing the leakage reactance increases the starting torque. The leakage reactance is related to the number of winding turns and the size of the air gap.

Therefore, when repairing the motor, it is important to maintain the number of winding turns and air gap of the original design.

3) The starting torque increases with the increase of rotor resistance. For example, when the wound asynchronous motor is started, the starting torque can be increased by inserting an appropriate additional resistance into the rotor winding circuit.

t=9549*p n, which is related to speed and power.

A dynamic torque sensor is a type of sensor that can measure both static and dynamic torque.

Due to their high measurement quality and low linearity error, sensors are also advantageous in terms of quality control or R&D. The MH803 is designed for contactless operation and zero maintenance

Ideal for production environments, whether it's a shift-based production line, a test bench, or an end-of-line test system.

The difference between dynamic torque and motor load torque is as follows:

1. The control function is different.

From a control point of view, speed control and torque control are independent control functions.

2. The control objectives are different.

The target physical quantity of speed control is the speed of the motor, and the target physical quantity of torque control is the torque of the motor.

3. The control principle is different.

From the point of view of control principle, speed control is to carry out closed-loop control with speed as the actual value, the speed regulator is in a closed-loop state, and the current regulator guides the current regulator through its output, and the current regulator controls the current of the motor, and adjusts the torque of the motor in a timely manner.

4. The control speed is different.

The local motor always tracks the set speed of the motor. Speed mode means that the inverter aims to control the speed of the motor, and the torque of the motor must be adjusted to maintain that speed.

Therefore, the outer ring of the control system is the speed of the lap of the ring, and the inner ring is the current ring. The output of the speed loop is a given (torque given) current loop, which is also known as a torque loop.

5. The purpose of control is different.

Torque mode means that the inverter is used to control the output torque of the motor, and the speed is related to the external load. At this time, the inverter generally has no speed loop, only a current loop, and the external given directly gives the current loop as the torque setting.

In order to prevent overspeed, many high-end inverters have a speed outer ring to limit overspeed, which is an enhanced torque mode in which the speed loop only plays a role in limiting the maximum speed, and the current loop still plays a dominant role.

The drag torque is generated by an electric motor to overcome the load torque to drive the movement of the production machinery. Static torque is the load torque generated by production machinery. Dynamic torque is drag torque minus static torque.

The load torque is the torque required by the load to be driven by the motor, which is not considered in the general mechanical rotation calculation due to the change of conditions, but will be changed in the electromagnetic calculation.

The dynamic torque is related to the drag torque, the static torque, and changes with the change of the drag torque.

Load torque is a variable that is related to the load.

Constant torque load: It is characterized by a constant torque size;

Constant power load: It is characterized by a constant load power;

Ventilation load: It is characterized by the fact that the torque is proportional to the square of the speed.

Each has its own characteristics, so it's better to go to the store and see if it's more reliable.