Abstract:The results of research on the creation of induction traction electric motors (EM), which made it possible to improve their technical, environmental and operational qualities, are presented. The main criterion for assessing the quality of EM were selected vibration levels. The main research methods were experimental and statistical methods. New technologies for assembling bearing units assemblies and EM as a whole were studied. New design and technological solutions have been developed. The dynamic characteris… Show more
“…The criterion for evaluating the quality of such electric motors is the classes of permissible vibration in the frequency range from 5 Hz to 10 kHz (Figure 2). 25,26 Vibration levels exceeding acceptable values are diagnostic signs of reduced reliability and service life of the traction electric motor, proportional to the amount of exceeding permissible vibrations.Figure 2.Ranges of vibration classes of electric motors.…”
Section: Improving Evaluation Methods For Traction Electric Motorsmentioning
The progression and refinement of traction electric motors play a pivotal role in the enhancement of vehicles. With constant advancements in power efficiency, diagnostic tools, and reliability, electric traction motors are becoming more economical in terms of operational costs. This article underscores the significance of methods used in assessing the technical proficiency of traction electric motors, coupled with their testing techniques. The vibration characteristics of these motors serve as a prime criterion in assessing their quality throughout their lifecycle – from design and manufacturing to operation. A groundbreaking proposition made in this article is the evaluation of electric traction motors’ health based on their vibration acceleration within an expansive frequency range of 5 Hz to 10 kHz. This contrasts the conventional approach which focuses on vibration speed in a restricted frequency spectrum up to 1000 Hz, as outlined by current standards. Such permissible vibration classes are essential in ensuring the high-quality design, technical finesse, and dependability of traction electric motors. Exceeding these vibration thresholds can result in rapid wear and tear, diminishing the motor’s reliability and lifespan. Hence, motors that surpass these permissible vibrations are not advised for vehicular use. Additionally, the article sheds light on requisite equipment controls for accurately gauging vibrations and noise levels in electric motors. Delving deeper into the nuances, the methods for mounting vibration transducers and electric motors on testing platforms are elucidated. These methods are pivotal in obliterating any hindrances that could impede the precise measurement of vibrations induced by an electric motor.
“…The criterion for evaluating the quality of such electric motors is the classes of permissible vibration in the frequency range from 5 Hz to 10 kHz (Figure 2). 25,26 Vibration levels exceeding acceptable values are diagnostic signs of reduced reliability and service life of the traction electric motor, proportional to the amount of exceeding permissible vibrations.Figure 2.Ranges of vibration classes of electric motors.…”
Section: Improving Evaluation Methods For Traction Electric Motorsmentioning
The progression and refinement of traction electric motors play a pivotal role in the enhancement of vehicles. With constant advancements in power efficiency, diagnostic tools, and reliability, electric traction motors are becoming more economical in terms of operational costs. This article underscores the significance of methods used in assessing the technical proficiency of traction electric motors, coupled with their testing techniques. The vibration characteristics of these motors serve as a prime criterion in assessing their quality throughout their lifecycle – from design and manufacturing to operation. A groundbreaking proposition made in this article is the evaluation of electric traction motors’ health based on their vibration acceleration within an expansive frequency range of 5 Hz to 10 kHz. This contrasts the conventional approach which focuses on vibration speed in a restricted frequency spectrum up to 1000 Hz, as outlined by current standards. Such permissible vibration classes are essential in ensuring the high-quality design, technical finesse, and dependability of traction electric motors. Exceeding these vibration thresholds can result in rapid wear and tear, diminishing the motor’s reliability and lifespan. Hence, motors that surpass these permissible vibrations are not advised for vehicular use. Additionally, the article sheds light on requisite equipment controls for accurately gauging vibrations and noise levels in electric motors. Delving deeper into the nuances, the methods for mounting vibration transducers and electric motors on testing platforms are elucidated. These methods are pivotal in obliterating any hindrances that could impede the precise measurement of vibrations induced by an electric motor.
“…The study showed that such an implementation is viable in terms of cost and energy efficiency. The use of a Induction Motor (IM) instead of an internal combustion engine [6,7] with approximately the same power increases the traction force by approximately 2 times.…”
Section: Research Status Of Electric Tractor Designsmentioning
One of the promising steps to improve the environment in various industrial sectors is the transfer of specialized technical means to alternative clean energy. Agriculture is not an exception, because the introduction of an electric drive on tractors of small traction classes, which are designed to perform traction, as well as small transport work, is relevant today. Such an implementation is implemented by replacing the internal combustion engine with an electric drive, in connection with this; the task of observing the traction properties of the tractor arises. Therefore, the material of this type aims to increase the traction efficiency of the wheeled lowpower tractor by optimizing its design features. The implementation of the outlined goal occurs due to the use of multi-criteria optimization when conducting a simulated numerical experiment of traction test cycles. When solving the set goal, the method of dynamic tests of the German Agricultural Society DLG-PowerMix is used, this includes 12 traction tests of an agricultural tractor. The result is a justified selection of the distribution of the total weight of the low-power tractor in combination with the tire pressure in conditions of compliance with the maximum average integral values of the speed and efficiency of the tractor, as well as the minimum average integral value of skidding, as those that should be implemented in an electric tractor. The practical significance of the work consists in providing specific values of weight distribution on the axle of the low-power tractor and tire pressure when aggregating with a plow, a cultivator, a rotary cutter and a hay mower, as well as taking into account the operation of a manure spreader and a hay baling. The scientific novelty of the work is the establishment of a relationship between the design parameters of the low-power tractor and the change in traction indicators during traction work, namely between the tractor weight distribution, tire pressure, speed, tractor efficiency and wheel slip.
“…Зниження рівнів вібрації ЕД дозволяє підвищити їх безвідмовність, довговічність, ресурс, зменшити шкідливий вплив на людину і навколишнє середовище, знизити витрати на технічне обслуговування електромобілів в цілому [14].…”
Problem. Despite the widespread use of asynchronous electric motors (ED) in electric transportation, they often fail to meet high reliability requirements. This is primarily due to their operation in a wide range of rotational frequencies, variable load modes, frequent stops and starts, and challenging road conditions. These factors result in significant vibrations of traction asynchronous EDs, leading to reduced reliability and service life. Goal: The goal of this study is to develop methods to enhance the reliability and longevity of traction asynchronous EDs by improving the design and manufacturing technology of the stator housing and rotor of the electric motor. Methodology: Analytical research methods were employed to investigate approaches for improving the quality of traction electric motors for electric transport. Experimental research methods were used to determine the technical condition of EDs based on their vibrodiagnostic parameters. Statistical methods were utilized to process experimental data. Results: Vibration levels, which are indicative of the technical condition of EDs, were selected as the primary criterion for assessing their quality. The proposed design and manufacturing technology for asynchronous electric motors enable the following: increased manufacturing and assembly precision of EDs, simplified assembly process, reduced number of sorted parts during inspection and bearing replacement, and the development of an asynchronous traction ED with a power capacity of 90 kW and a rotational frequency of 3000 rpm, meeting class D requirements with permissible vibration levels. Originality: This study presents developed methods for increasing the reliability and longevity of traction asynchronous EDs through experimental approaches. The one-sided arrangement of base surfaces in the stator housing and the attachment of rotor bearing units enabled the production of a vertical ED assembly consisting of two independently controlled units: a housing with a shield and a rotor with bearing units. Practical Value: The achieved reduction in vibration levels allows for a predicted 2-3 times increase in the lifespan of the developed ED, depending on operating conditions. Furthermore, the created ED meets all environmental standards' requirements for vibration levels.
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