Operation of BLAC motor using PM enhanced sensing of internal EMF variation

Srivastava, R. K.; Singh, Shweta; Dwivedi, Ankita; Gollapudi, Srikanth

doi:10.1109/icsenst.2012.6461697

Cited by 3 publications

(11 citation statements)

References 8 publications

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“…Figure 16(a) shows the no-load steady state auxiliary and main winding voltage waveforms, when the rotor is allowed to move due to external starting torque. In the event of frictional loading of rotating outer hub, the waveforms of main and auxiliary winding voltages are shown in Figure 16 The torque-speed characteristics obtained [17] for the test motor upon loading is shown in Figure 19(a). The theoretical results have been calculated using Ref [25] given in APPENDIX-C and the compared with the experimental results.…”

Section: Resultsmentioning

confidence: 99%

“…It can be observed that experimental results validate the theoretical results. [17] The torque-speed characteristics of the prototype motor with different magnets are depicted in …”

Section: Resultsmentioning

confidence: 99%

“…For motoring operation of PMBL motor, the applied AC coil voltage should be in phase and also higher than that of speed 1463 induced AC back EMF in the coil. Any change in the phase difference between applied voltage and instantaneous winding induced EMF results in change in the torque speed characteristics of the brush less motor [17,25]. For normal motor operation of PMBL motor, the zero crossing of back EMF is regarded as most suitable signal for commutation of coil current.…”

Section: Principle Of Operation Of Pmbl Motorsmentioning

confidence: 99%

“…Power Operation amplifier circuit using L165 P-OPAMP for driving PMBLAC motor (firing circuit not shown for clarity) (b) Power Operation amplifier circuit using LM675 P-OPAMP for driving PMBLAC motor (firing circuit not shown for clarity) [17,21,22] of EMF induced in the coil. Figure 11(b) depicts the flux density distribution in space when motor is running without and with magnetic switch, computed using FEM software ANSYS Multiphysics 11.0.…”

Section: Effect Of Armature Reaction In Pmbl Motormentioning

confidence: 99%

“…The proposed scheme is an extension of Unnewehr [15] work, where instantaneous rotor position is determined using permanent magnet enhanced sensing of motor EMF variation. The EMF thus obtained is amplified using commercially available P-OPAMP for supplying power to torque producing windings [17,23,24].…”

Section: Principle Of Operation Of Pmbl Motorsmentioning

confidence: 99%

See 4 more Smart Citations

PM Enhanced Sensing of Internal EMF Variation-A Tool to Study PMBLDC/AC Motors

Srivastava

Singh

Dwivedi

et al. 2013

International Journal on Smart Sensing and Intelligent Systems

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Section: Resultsmentioning

confidence: 99%

“…It can be observed that experimental results validate the theoretical results. [17] The torque-speed characteristics of the prototype motor with different magnets are depicted in …”

Section: Resultsmentioning

confidence: 99%

Section: Principle Of Operation Of Pmbl Motorsmentioning

confidence: 99%

Section: Effect Of Armature Reaction In Pmbl Motormentioning

confidence: 99%

Section: Principle Of Operation Of Pmbl Motorsmentioning

confidence: 99%

See 3 more Smart Citations

PM Enhanced Sensing of Internal EMF Variation-A Tool to Study PMBLDC/AC Motors

Srivastava

Singh

Dwivedi

et al. 2013

International Journal on Smart Sensing and Intelligent Systems

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Analysis of permanent magnet brushless AC motor using Fourier transform approach

Dwivedi

Singh

Srivastava

2016

IET Electric Power Applications

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The paper presents an analytical model for determining performance characteristics of surface mounted permanent magnet brushless motor using Fourier transform technique. The proposed scheme assumes a simplified geometric model of surface mounted PM (SMPM) motor with dual current sheets using layer theory to analyse electrical machines. The layer theory considers regions of PMBLAC motor to be replaced by layers of respective homogeneous material properties. Isotropic model assumes stator to be sloltless while anisotropic model is also considered to account for stator slotting effect on the motor performance. The Fourier transform applicable to linear induction motor and introduced by S. Yamamura is modified and adapted for analysing PMBLAC motor. The primary stator winding and permanent magnets on rotor are replaced by their respective equivalent linear current densities. The proposed model is validated using experimental results from a 12-slot surface mounted PMBLAC motor. The proposed method is capable of calculating the effect of design parameters on the performance of the SMPM motor, thus making it suitable for design and optimisation at initial stage. Moreover, analytical validation is also presented to prove the effectiveness of the proposed method. Nomenclature A magnetic vector potential (A/m) D diameter of stator bore of original machine (m) H magnetic field intensity M magnetisation vector N number of conductors in primary winding T torque (Nm) H c coercivity of PM (kA/m) J p peak stator or primary linear current density (A/m) J s peak rotor or secondary linear current density corresponding to the dimensions, disposition and strengths of magnets in use (A/m) m ratio of two current densities (J p /J s ) I p stator coil current (A) p number of poles f frequency of stator supply (Hz) v peripheral speed of rotor (m/s) g actual air gap (mm) g e effective air gap length (mm) k pole pitch (mm) k e back-EMF constant h m thickness of magnet (mm) l layer number (subscript) σ l conductivity of respective layers (S/m) t pole pitch of original motor (m) t m pole pitch of the PM (m) j phase difference between primary and secondary current sheets k w1 winding factor j, χ, g Fourier indices of respective layers w o width of stator slot opening (mm) μ 1 permeability of rotor back iron (H/m) μ o absolute permeability of air (H/m) µ r = µ 2 relative permeability of PMs (H/m) t t stator tooth width (mm) t c stator coil width (mm)t w stator tooth-tip width (mm) t s stator slot-opening width (mm) ω angular speed (rad/s)

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