Spacecraft Inertial Systems Group

Thiruvananthapuram, India

Spacecraft Inertial Systems Group

Thiruvananthapuram, India
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Ravichandran M.H.,Spacecraft Inertial Systems Group | Sadasivan Achari V.T.,Spacecraft Inertial Systems Group | Joseph C.C.,Spacecraft Inertial Systems Group | Devasahayam R.,Spacecraft Inertial Systems Group
2010 Joint International Conference on Power Electronics, Drives and Energy Systems, PEDES 2010 and 2010 Power India | Year: 2010

Magnetic field analysis of the Halbach array permanent magnet brushless dc machine was carried out. Initial designs, selection of major parameters, prediction of air gap field density are carried out by using the analytical model. Performance of three types of machine configurations, Slotless PMBDC, Coreless enclosed rotor type with and without Halbach array magnet of same envelope are analyzed using FE. Coreless PMBDC machine delivers maximum torque with minimum ripple among the three configurations. The proportion of flux focusing magnet is optimized to deliver are obtain near trapezoidal flux pattern in the airgap. The machine was realized and tested. Power consumption for 2Nm at 50 RPM is 43% lesser than that of conventional slotless PMBDC machine of same size. As the machine is coreless, cogging torque and magnetic stiction are eliminated and hence provide better pointing stability. © 2010 IEEE.


Ravichandran M.H.,Spacecraft Inertial Systems Group | Achari V.T.S.,Spacecraft Inertial Systems Group | Joseph C.C.,Spacecraft Inertial Systems Group | Devasahayam R.,Spacecraft Inertial Systems Group
Journal of Spacecraft Technology | Year: 2010

This paper gives the details of the design analysis and development of Halbach array PMBDC motor for torquing the gimbal of control moment gyroscope, initial design, selection of major parameters and airgap magnetic flux density are estimated using the analytical model of the machine. Three types of the machine configurations, Slotless PMBDC, Coreless enclosed rotor PMBDC with and without Halbach array magnet were analyzed using FE and compared. Coreless enclosed rotor Halbach array PMBDC machine delivers highest average torque among the three configurations. The proportion of Halbach array is optimized using FE to deliver near trapezoidal flux pattern in the airgap. The machine was realized and tested. This machine develops 1.3 Nm for IA excitation and 5.2 Nm for 4A. Power consumption for 2Nm at 50 RPM is 43% lesser than that of conventional slotless PMBDC machine. As the machine is coreless, cogging torque and magnetic stiction are eliminated and hence provide position stability.

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