What is the industry standard for servo motors?
Hi! Hi everyone, as a supplier who has been dealing with servo motors for many years, I often get asked, "Is this servo motor qualified? What standards have to be looked at ah?" Servo motors are like "precision dancers" in the equipment, every move has to be followed, and the industry standard is its "dance manual", which stipulates what kind of "basic skills", 'stamina' and "endurance" it should have. "endurance" and "coordination". Today let's talk about what key requirements are written in this "manual".
First, the "basic skills" up to standard: performance parameters have a bottom line
Like dancers have to have a standard split, rotary action, the core performance of the servo motor also has a clear "passing line", these parameters directly determine whether it can accurately complete the task.
1. Speed and speed range: servo motor has to be like a "variable speed bicycle", fast and slow adjustable and stable. Industry standards require that the speed fluctuations under the rated speed should not exceed ± 0.5%, and the speed range should be at least 1:1000 (from 1rpm to 1000rpm can be stable operation). For example, in a precision machine tool, the motor has to be switched from slow feeding to fast moving, and the rotational speed cannot "wobble" even if it varies greatly, otherwise the processed parts will be in error.
2. Positioning accuracy and repeat positioning accuracy: this is the servo motor's "watchword", like shooting an arrow to hit the bull's-eye. The standard specifies that the positioning accuracy is generally not less than ± 0.01mm (for supporting ball screw system), repeat positioning accuracy should be controlled within ± 0.005mm. An automated sorting equipment has been due to repeated positioning of the motor is not allowed, resulting in frequent misplacement of goods, replaced with a motor that meets the standard, the accuracy rate increased to 99.9%.
3. Response speed: the motor has to be like a "sprinter", start and stop quickly. From the time of receiving the signal to reach the rated speed, the standard requirement is no more than 100ms; after receiving the stop signal, the braking time is no more than 50ms. in the robot welding scenario, the response is slow will lead to weld point offset, meet the standards of the motor in order to ensure that the welding is accurate.
Second, "physical quality" hard: safety and reliability are guaranteed
servo motor "body" to withstand the test, like a warrior to withstand the wind, rain and snow, the standard on its safety performance and durability have strict provisions.
1. Insulation and voltage: motor internal "circuit system" has to be like "wearing an insulating suit" to prevent leakage. Standards require that the insulation resistance between the windings and the shell can not be less than 100MΩ, in 1 minute to withstand 1500V voltage test (DC) can not be broken. A food production line has been due to poor insulation motor leakage, after investigation, found to be the winding moisture, according to the standard replacement of insulation materials, and then there is no safety issues.
2. Temperature rise and overload capacity: the motor can not work for a long time "high fever", just like the human body temperature can not exceed the standard. The standard provides that the ambient temperature of 40 ℃, the motor shell temperature rise can not exceed 80K (that is, the shell temperature does not exceed 120 ℃); overload capacity to reach 150% of the rated load to work for 1 minute without damage, like the occasional "overtime" can also be carried. A packaging machine motor burned due to frequent overload, replaced with a model that meets the overload standards, 8 hours of continuous work without overheating.
3. Life and vibration noise: high-quality motors have to be "long-life champion", the standard requirements of the rated working conditions of the service life of not less than 10,000 hours (about 5 years); vibration speed level of not more than 71dB, the noise does not exceed 75dB, like "quiet work does not disturb the people! ". In laboratory equipment, low noise motors in order to avoid interference with precision measurements.
Third, the "external image" compliance: structure and installation specifications
servo motor 'shape' and "installation mode" must also be in accordance with the standard, just like the actor on stage to wear the prescribed clothing, to ensure that the equipment and the "fit". and equipment "with the tacit understanding".
1. Shaft extension and flange size: the motor's output shaft (shaft extension) is like a "handshake position", the diameter and length should be standardized, such as 80 flange motors, shaft extension diameter of the common 14mm or 19mm, the tolerance control in the h6 level (-0.011mm to 0mm), so that the coupling and the "grip tightly". This is the only way to "hold tight" with the coupling. A customer due to the motor shaft extension size over the difference, resulting in loose coupling installation, and re-exchange the standard size before the solution.
2. Protection level: according to the working environment, the motor has to have the corresponding "protective equipment". IP54 level (dustproof and waterproof splash) is suitable for general workshop, IP65 level (anti-spraying) is suitable for wet environment, just like going out on a rainy day to choose an umbrella or a raincoat. In a car wash, it is essential to use IP65 rated motors, otherwise rainwater penetration will burn the internal parts.
Interface and identification: the electrical interface of the motor (such as encoder plug, power interface) to be standardized, like a cell phone charging port unified specifications to facilitate; shell should be clearly marked with the model number, rated parameters, date of manufacture, like the "ID card" complete, convenient for late maintenance.
Fourth, "special talent" standard: segmented areas have special requirements
servo motors in different industries, like a "special talent" dancers, in addition to the general standards, there are industry-specific requirements.
1. Machine tool industry: to pass the "high-speed high-precision test", in 1500rpm speed, positioning accuracy of long-term retention (after 2000 hours) attenuation of no more than 10%, like a dancer jumping for a long time without deformation. A machining center with a servo motor, in line with the special standards for machine tools, continuous processing of 1,000 parts, accuracy fluctuations of only 0.002mm.
2. Robotics industry: pay attention to the "lightweight" and "dynamic response", the motor weight is more than 20% lighter than ordinary models, acceleration time (from 0 to 3000rpm) is no more than 50ms, like a gymnast agile. Collaborative robots with motors, but also have to pass the "collision safety test", touching people can immediately stop.
Aerospace field: to pass the "extreme environment", in - 55 ℃ to 125 ℃ temperature normal operation, anti-vibration level of 20g (acceleration), like the "space dancer" to adapt to weightlessness and radiation. A satellite attitude adjustment motor, because it meets the aerospace standards, has been operating stably in space for 5 years.
Summarizing
the industry standards of servo motors, just like a "all-round dancer training manual", from the basic performance to safety and reliability, from the structural specifications to the requirements of subdivided fields, all-round delineation of the "qualification line". These standards are not constraints, but the basis for ensuring that motors "dance steadily, accurately and for a long time" in a variety of equipment. As a user, understand these standards can help you choose the right motor; as a supplier, follow the standards in order to build a reliable product. After all, a servo motor that meets the standard can really become a device in the "star dancer", so that the whole system operates efficiently.
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