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T-Drones NEW LI-ION BATTERY Email: [email protected] TEL • +86-15070853230 Electric motors | Focus hinders the development of eddies. Iron and steel laminations with different grades of material additions or design qualities are now available. For instance, some e-motor makers have investigated how much silicon should be used in electrical steel in order to improve its performance without having a negative effect on its brittleness or weight, and how thick the laminations should be. Thinner layers can be harder to manufacture, and are not necessarily useful if a motor is not going to run at very high speeds. However, growing demand from UAV manufacturers on the capabilities of electric motors has driven some producers towards progressively thinner laminates, in one case from 3.5 mm sheets to 2 mm sheets, with thinner layers potentially planned for the future pending data from further r&d. However, issues with weight and a propensity for lamination faults, as well as the inevitable absorption of flux by iron or steel stators once magnetic saturation is reached, has driven some manufacturers to innovate alternative architectural approaches, in the hope of creating iron-less stators. Iron-less stators Iron-less motor cores are not a new idea, they have been discussed and even produced for many decades. They are superb for high-speed applications, are extremely weight-efficient and far less prone to thermal and eddy current losses during operation. Forgoing an iron core also largely removes the thermal- and saturation-related caps on performance, meaning they can theoretically exhibit very high peak torque outputs (although that depends on copper density). The absence of iron also removes the ‘cogging’ effect, in which the core intermittently exerts an unwanted attraction on the permanent magnets. Eliminating that reduces both vibration and torque ripple, meaning a much smoother and quieter power output (unless a poor motor controller is used). Until recently, however, iron-less motor cores have been extremely costly to produce, and have been inflexible in terms of how easily they can be customised from existing manufacturing lines. New iron-less designs unveiled in the past few years though are formulated around overcoming these issues. Circumferential flux motors for instance are built without any kind of core layers that radial and axial flux motor stators tend to use, as they are largely unnecessary in terms of the motors’ strength and precision manufacturing requirements. Also, the unique form and low heat generation of their stator windings have steered them towards using teeth made from plastics or composites, using 3D printing for prototyping or small batches, or Precision Drive Systems Simply the best for your ROV maxon thruster and actuators Max. depth limit of up to 6,000 meters High energy efficient of minimum 80 percent Long service life of up to 1,000 operation hours aquaticsolutions.maxongroup.com