Development of a dynamometric test stand for comprehensive motor-wheel assembly testing

The development of electrified transport is constrained by the lack of unified methods and test stands for evaluating the characteristics of motor-wheel assemblies under conditions close to real operation. A significant limitation of existing analogues is their inability to synchronously record electrical and mechanical parameters under the combined effect of vertical load and horizontal tractive resistance. (Research purpose) The study aimed to develop a dynamometric test stand with a combined loading system and a methodology for comprehensive testing. (Materials and methods) The test stand consists of a frame designed as a movable platform equipped with a motor-wheel assembly and weight platforms used to apply a vertical load, as well as a load simulation platform that generates adjustable tractive resistance. The rear section of the movable platform is flexibly connected to the load simulation platform through a force-measuring unit. A microcontroller unit synchronously records current, voltage, rotational speed, temperature, and time. (Results and discussion) Tests were carried out on asphalt concrete at a wheel load of 300 newtons, a module base length of 0.6 meters, a wheel radius of 0.125 meters, an initial vertical dynamometer reading of 50 newtons, a rolling resistance coefficient of 0.02, and an adhesion coefficient of 0.7. The platform load was varied from 50 to 400 newtons, and the power input from 50 to 600 watts. Kinematic relationships were derived. At a platform load of 100 newtons and a power range of 50–350 watts, the tangential force was 58.7 newtons, the tractive force was 52.7 newtons, the vertical sensor reading was 37.8 newtons, the rolling resistance was 6.0 newtons, and the torque was 7.3 newton-meters. At a platform load of 350 newtons, the tangential force increased to 192 newtons, the tractive force to 186 newtons, while the vertical force decreased to 10 newtons, the rolling resistance remained 6.0 newtons, and the torque reached 24 newton-meters. The torque varied with the platform load and was almost independent of the power input. Slippage was recorded at loads above 384 newtons. (Conclusions) The test stand enables synchronous acquisition of time-dependent electrical and mechanical parameters for evaluating the efficiency of a motorwheel assembly, determining rolling resistance, validating mathematical models, and substantiating control algorithms for traction electric drives over the operating load range.

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