Which motor should the packaging machine use?
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Rotary servo drive technology and its similar linear motor technology are likely to enter the packaging machinery industry and may not be accessible, depending on who is discussing the issue with you. A small number of packaging machine manufacturers are paying attention to the high flexibility that linear motors can bring to industrial applications, which is what is necessary in packaging machine design to ensure the integrity of the packaged product.
Claude Chirignan, senior applications engineer at Anorad in Sherry, NY, believes that engineers in the packaging machine industry don't have to be fascinated by the high precision or high smoothness of linear motors. These two features only help to meet semiconductor process equipment and machine tools. The special specification requirements, but should focus on another capability of linear motors, which can reliably extend the accuracy to almost any imaginable stroke length, which is obviously different from the ball screw drive, Chirignan added, the transmission When the length is large, the ball screw may have distortion, breakage, and other problems of the drive shaft.
The way of movement is different: the linear motor system produced by Jacobs Automation LLC is different from the traditional system. The output device, propulsion device and mover reciprocate in a straight line, and the track control method is also different. Control each mover.
However, George Gulalo, president of Motion Tech Trends, an industrial analysis and market research firm specializing in motor and motion control technology, believes that linear motors are too powerful for most packaging machines. The movements produced by packaging machinery are fundamentally relatively "stupid", and it is more appropriate to handle such movements by conventional cylinders and air motors.
New motors join the dispute
At least one established packaging company is still sketching areas where linear motors may be suitable. Kevin Jacobs of Jacobs Automation LLC has long followed the vertical and horizontal form, fill and seal machines with a keen eye, thinking about all the opportunities he can detect, with a view to applying his newly patented linear motor design. Unlike traditional linear motor systems, the new system designed by Jacobs, the power output, propulsion and mover reciprocate in a straight line, as if reciprocating on the two straight sides and the two swivel sides of the elliptical track. The same as the slot rail electric toy car. It is also unusual for PackTrak to be able to run multiple movers at the same time, and each filter can be controlled separately.
Jacobs believes that with this layout, PackTrak can replace the two servos on the rotary servo and the rotary servo motor, which is connected to the connecting rod drive of the opposing sealing head frame of the forming, filling and sealing machine. As needed, the pair of moving moves in the opposite direction always maintains a synchronous movement relationship with the movement of the package. As long as the heat sealing head maintains heat, it can be in close contact with both sides of the film and complete the fusion process for any length of time necessary. Thus the sealing time will no longer limit the duty cycle of the packaging machine.
The technological innovation of linear motors also helps manufacturers cope with the growing demand for flexibility. Jacobs remembers that a cookie maker could only offer two package sizes for the same product 20 years ago, and now the company has been able to offer 40 package sizes for the same cookie.
Replacing the fixed-pitch chain-bulk carrier currently used in flow packaging machines with linear motor slides can help engineers easily cope with changing package sizes and switch panel functions when switching between any package size.
Flexibility is critical for packaging equipment engineers, and Gary Schultze, senior electrical engineer at California Linear Devices in Carlsbad, agrees. He believes that a packaging machine may run at the same set position due to 50% or even 70% of the output of a certain product. The linear transmission consisting of a rotary servo motor and a ball screw will start and stop repeatedly at the same position. Countless times and eventually lead to wear points. Linear motors have limited mechanical contact and are present between the support shaft and the bushing so that they do not wear out after repeated operations. This means longer life and increased productivity, which he believes will help convince engineers of the practical value of linear motors.
He said that his company's cylindrical linear motors have been declared to enter some packaging applications that place great emphasis on high acceleration. For examples of what their company has developed or are paying attention to, there are many examples, such as grid brakes, separators, and fast. Return conveyor, packing machine, bottle filling machine, etc.
However, John Kowal, global marketing manager for packaging automation company Elau, believes that 50% of the linear motor market is still in the semiconductor industry and is called a “very ideal” application, requiring only a lighter and relatively consistent load. . Most of the demand for larger linear motors comes from the machine tool industry. A few years ago, the linear motor industry looked forward to the packaging industry to be the next big field, but it has not been able to do so. After all, linear motors are still much more expensive than rotary motors and gear drives, he explained.
He even believes that the high acceleration capability of linear motors, measured in terms of G, is not necessary for packaging materials such as milk, and adds that a fifth-order polynomial control strategy is sufficient to easily handle the slowdown required to prevent splashing.
He believes that the next-generation full-servo models in the packaging industry may not be able to use linear motors in large numbers. The application of linear motors is always limited to special occasions that require fast, short strokes.
New features of linear motors
The latest developments in linear motor technology:
■ A unique new linear motor system from Jacobs Automation LLC differs from a conventional linear motor system in that the power output, propulsion and mover reciprocate in a straight line, as can be along an elliptical track. An electric toy car with two straight sides and two swivel sides moving back and forth. Another unusual feature of PackTrak is the ability to run multiple movers simultaneously and control the trajectory of each mover separately. These "passive" movers are completely controlled by the coils that are fixed in the track, without any external connections, and thus can be freely run along the track without being entangled and bound by ropes, cables or chains.
■ Trilogy Systems believes that market sales indicate that users are reluctant to pay extra costs for permanent magnets that are not used in iron-free motors, but prefer iron-core motors that have lower magnet costs, so they began to focus on iron cores four years ago. Motor. The company recently adopted a patented technology that eliminates the positioning force of a linear motor with a core. Without reducing the efficiency, it can rely on the mutual offset of the positioning force to improve the smoothness of the motion. This new linear motor is equipped with a straight line. The rotary servo system of the encoder is more competitive in price.
■ Baldor's latest version of the hybrid linear motor uses toothed slotted steel to replace the expensive permanent magnet track. Its target market is where the requirements for use are not very high and there is no need for extremely high speeds, such as general-purpose actuators, low-end gantry, wood cutting machines and other related fields. Baldor produces a full range of core and ironless linear motors.
■ Anorad has developed a fourth-generation ironless linear motor with a higher thrust, higher efficiency, lighter weight and better heat dissipation, and a fifth-generation iron core linear motor. The company claims to have been able to increase the effective thrust of linear motors by up to 30%, and offers a wash-resistant, stepped, linear motor module with IP65 protection.