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Axial flux permanent magnet (AFPM) synchronous motors are attractive for low speed direct drive systems because of their high specific torque. The present paper proposes a novel axial flux machine topology, called MAGNUS, obtained by combining a yokeless central stator type NS arrangement with two external high polarity spoke-rotors, resulting in very high flux concentration. The stator, which includes...
This paper describes a simple ripple compensation method of suspension force and torque in a bearingless surface-mounted permanent magnet (SPM) motor with two-phase integrated winding configuration. Only two H-bridges or eight power transistors are used for the proposed topology. The neutral point of each phase is connected to the middle point of the power sources to superimpose the suspension and...
Wound rotor synchronous machines have gained popularity as an alternative to permanent magnet synchronous machines and methods to improve the efficiency of these machines are continuously sought after. At the same time, non-overlap windings have gathered ground because of its associated lower cost and good torque density. However, non-overlap windings are also characterized by relatively high sub...
The novel doubly salient slot permanent magnet linear machines (DSSPMLMs) are proposed in this paper. First, the topology and geometric parameters of the DSSPMLMs with 12 slots are introduced, and the corresponding basic operating principle is investigated. Then, feasible slot/pole combinations and winding configurations are further analyzed. To the DSSPMLMs with 12 slots, all structures with 10/11/13/14...
In this paper, comparisons between two permanent-magnet-free (PM-free) machines, namely a wound-field flux-switching machine (WFFSM) and a switched reluctance machine (SRM), covering skewed-rotor and straight-rotor structures are conducted. The topologies and operation principles of the WFFSM are illustrated firstly. Then, the effects of rotor skewing angle on static characteristics, e.g., open-circuit...
This paper proposes a novel variable reluctance hybrid magnet memory machine (VR-HMMM), which is geometrically characterized by doubly salient structure having homopolar hybrid magnets alternatively mounted on the stator poles. The magnetizing coils are wound on the PM excitation teeth to vary the magnetization states of low coercive force (LCF) magnets, and hence the air-gap flux can be flexibly...
Aiming at the problem of multi-DOF bionic drive, a new type of hybrid driven permanent magnet multi-DOF motor with liquid suspension mode is presented in this paper. The structure and working principle of the motor are introduced in detail. The analytical method and the finite element method are used to analyze the air gap magnetic field, and the results are compared and verified. In addition, the...
This paper compares the performance of Synchronous Reluctance Motors (SynRMs) using two different star-delta winding connections under normal operation. All the machine parameters are kept the same while the winding layout is only modified. The compared winding layouts differ in the combination between the number of coils of the star and delta winding sections. The two adopted windings are the only...
Gyrowheel is a unique attitude control device to measure external rates of the spacecraft body as well as provide momentum control. To ensure the external rate sensing accuracy of Gyrowheel, study of the accurate characterization of the currents in the torque coils is performed in this paper. Components of the current signals and the sources of them are analyzed, and an effective filtering method...
A fault of the coils or the inverter of a permanent magnet synchronous machine (PMSM) can yield a potentially dangerous behavior. To allow for an operation even in this case, PMSM constructions with redundant stator coils and inverter legs have been proposed in literature. This paper describes a method to systematically determine optimal coil currents for the torque control in the case of an open...
This paper presents a novel angular velocity estimation strategy of a Reaction Sphere (RS) for satellite attitude control based on a Linear Parameter-Varying (LPV) Kalman Filter. The reaction sphere is a permanent magnet synchronous spherical actuator whose rotor is magnetically levitated and can be accelerated about any desired axis. The spherical actuator is composed of an 8-pole permanent magnet...
A parameterized design of speed servo controller for brushless DC motors is presented based on a robust composite nonlinear control framework. The servo controller consists of a linear control part for achieving fast response, a nonlinear feedback part for suppressing the overshoot, and a disturbance compensation mechanism for erasing the steady-state error. A reduced-order extended state observer...
This paper presents a novel design of an integrated electro-magnets driven spherical parallel manipulator which produces 3-degree-of-freedom (3-DOF) rotational motion within the workspace. The spherical parallel manipulator is actuated by the interaction between stator coils and the rotor magnetic field. The kinematic and dynamic models are developed. The torque model is formulated analytically based...
The CubeSat form factor was very successful at reducing development and launch costs for spacecraft. The PocketQube (PQ) — one eighth the size of a CubeSat — aims to further reduce these costs. However, the question remains on whether it is feasible to implement a fully-featured satellite within the far tighter constraints imposed by a PQ. This paper explores the implications of including a 3-axis...
It is analyzed the transient regime, electric, magnetic and mechanic, when starting a dc electrical machine supplied by half - commanded rectification bridge. The time variation of the current, as well as, the time variation of the roll, when the entire electromechanical chain is starting, is established by computer modelization.
This paper describes a simple integrated winding configuration for a two-degrees-of-freedom (DOF) controlled bearingless motor with 6-slot/6-pole surface-mounted permanent magnet (SPM) structure. This bearingless SPM motor has only three concentrated coils, wound alternately in the stator's 6 slots, and employs only one three-phase inverter for both two-DOF radial magnetic suspension and motor drive...
Permanent magnet machines including a magnetic gearing effect are attractive for low-speed high-torque applications. This paper proposes a dual-stator axial-flux machine topology with a high ratio for the number of rotor poles to concentrated stator coils. The stator consists of a relatively small number of teeth, with each tooth including multiple smaller/auxiliary teeth. The rotor employs spoke-type...
Torque ripples can reduce precision control and increase vibration and noise in electric vehicles, servo systems, and wind generators. To address this problem, two novel winding methods are proposed. In one method, three-phase coils are wound around each tooth, with each coil having a different number of turns around a given tooth. In the other method, coils with as many phases as stator teeth are...
The switched reluctance machine (SRM) has seen a lot of interest due to its simplicity and ruggedness. Much attention have been paid in academia to improve on some of the disadvantages of the technology such as torque ripple, acoustic noise and low torque density. In this paper a topology, namely the double U-core SRM, is reviewed. This topology improves on some of the disadvantages of the regular...
This paper presents a four stator-pole stator-ferrite permanent magnet synchronous machine single-phase self-starting small motor drive in terms of: adopted topology, FEM assisted optimization design and controlled dynamic model simulation results for PN=85W, IN=0.65A, VDC=290V (single phase inverter fed), nN=3000rpm, for an electrical efficiency of 87%.
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