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Dependence of the torque-rotor position characteristic from the tape winding current DOI:10.15199/48.2019.09.14

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Permanent magnet torque motors have linear speedtorque and regulation characteristics, high operating speed, reliability and durability, especially in severe operation conditions. These advantages allow using permanent magnet torque motors in low-powered direct drives. At present, many companies are engaged in the development and improvement of such motors [1, 2]. The history, current state, main problems and solutions concerning torque motors, are described in the works of Mikerov [3-5]. Theoretical principles which are common practice in the operation of brushless DC torque motors are presented in [6-8]. Unlike classical motors, direct drive motors possess a modular structure consisting of two assemblies, namely rotor and stator. A rotor in a typical torque motor is made of high-coercivity rare-earth permanent magnets. A stator is made of laminated steel stacked up to carry windings. Steel laminations in stator can be slotted or slotless. A slotless core is more appropriate for high precision systems, since there is no cogging torque. In this design, permanent magnet motors are manufactured by industry [9-11]. Nowadays, both magnetic circuits and windings are being investigated in order to improve characteristics of torque motors [12, 13]. In 2008, a novel type of the torque motor active element was designed at Tomsk Polytechnic University. Thus, the traditional winding was replaced by a tape winding [14]. Benefits from this active element include the novel design and technological approach to the manufacture of the stator; a possibility of high current load with the appropriate heat removal; identification of desired functional dependence between the torque and rotor rotation angle. Martemyanov and Dolgih [14] suggested a limited angle tape winding torque motor schematically presented in Fig. 1 [14]. The rotor represents a multipolar permanent magnet 1 connected to the magnetic core 2 via a nonmagnetic disk 3. The stat[...]

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