There are some differences between the stepper motor and the belt-pulling motor used in the packaging machine in terms of function, working principle and application scenarios. The following will elaborate on these aspects in detail:
Functional differences
1. Stepper motor:
- Diverse functions: The stepper motor has multiple functions in the packaging machine, such as feeding packaging film, controlling the transverse sealing wheel, driving the metering screw, etc. It can accurately control the rotation angle and position according to the given electrical pulse signal to achieve precise positioning and fixed-length supply.
- Precise control: Stepper motors are particularly suitable for occasions with strict requirements on speed and position, such as packaging machinery parts that require precise metering or positioning.
2. Belt-pulling motor (here it is assumed to be a traditional motor for belt-pulling function, such as a DC motor or a servo motor):
- Main function: The belt-pulling motor is mainly used to pull packaging film or other materials to achieve intermittent or continuous feeding. Its function is relatively simple, and it mainly focuses on the stability and reliability of the pulling force.
- Control accuracy: Although the belt-pulling motor can also achieve a certain control accuracy, it may be slightly insufficient in applications that require precise control of position and speed compared to the stepper motor.
Differences in working principles
1. Stepper motor:
- Electric pulse drive: The stepper motor is an open-loop control element that converts a given electric pulse signal into an angular displacement or a linear displacement. Given an electric pulse signal, the stepper motor rotor rotates the corresponding angle (step angle).
- Digital control: Due to the linear relationship between the electric pulse signal and the stepper motor rotation angle, the stepper motor has high precision and flexibility in speed control, position control, etc.
2. Belt-pulling motor (taking DC motor as an example):
- Current drive: DC motors usually control the speed and direction by changing the magnitude and direction of the current. Its control method is relatively simple, but the accuracy and flexibility may not be as good as stepper motors.
- Analog control: In terms of control, DC motors rely more on analog signals or simple digital signals, and it is difficult to achieve high-precision digital control like stepper motors.
Differences in application scenarios
1. Stepper motor:
- Wide application: Stepper motors are widely used in packaging machinery, not only limited to belt-pulling functions, but also including metering, horizontal sealing and other links.
- High-precision requirements: In situations where precise control of position and speed is required, such as the speed and number of revolutions of the metering screw, the speed synchronization of the transverse sealing wheel, etc., stepper motors have obvious advantages.
2. Belt-pulling motors:
- Specific functions: Belt-pulling motors are mainly used for the belt-pulling function of packaging films, especially in some situations where the control accuracy requirements are not particularly high.
- Traditional applications: In some traditional packaging machinery, belt-pulling motors may still occupy a certain market share, but with the advancement of technology and the reduction of stepper motor costs, their application scope may gradually narrow.
In summary, there are certain differences between stepper motors and belt-pulling motors in packaging machines in terms of function, working principle and application scenarios.
Stepper motors occupy an important position in packaging machinery with their high precision, high flexibility and wide range of applications; while belt-pulling motors mainly undertake the belt-pulling function and still have certain application value in specific occasions.