| Solar energy is a kind of energy with the potential of development, but the current solar utilization is not efficiently. The theories analysis expresses, adopting the solar tracking can increase 37.7% the rate of the energy accepts, so a lot of domestic and international scholars investigative the device of solar tracker.Firstly, on the basis of the principle of domestic and international solar trackers, the result expresses that these device have the weakness of low rigidity, having the small scope of tracking and low accuracy. So, this paper presents a new two-axes solar tracker, which the device adopts spherical 3-DOF parallel mechanism. Secondly, based on spherical trigonometry theory, proceed the kinetics analysis to the spherical 3-DOF parallel mechanism, and given the position inverse solution, the velocity inverse solution equation and the Jacobian Matrix. Thirdly, study the mechanism character of the spherical 3-DOF parallel mechanism. Using the theory of Conformal Transformation, the planar figures of the workspaces are mapped. On the study of the spherical 3-DOF serial mechanism workspaces, we can give the reachable workspace, the atlases of reachable workspaces, the mobile workspace and the atlases of mobile workspace of the spherical 3-DOF parallel mechanism which given geometric parameters. From these atlases, we can see that the mechanical function is better when β1,β2 was given and α1, α2 tend 90°. Through analysis the Jacobian Matrix, we can give the singularity of the spherical 3-DOF parallel mechanism. Finally, select the geometric parameters as α1 =90°,α2 = 90°, β1 = 60°, β2 = 60°take the summer solstice day of Tianjin City as an example, and proceedkinetics simulation with Adams. Though simulation, give the angle, angular velocity, angularacceleration of every motor and Verify the possibility of the mechanism. It offered thefoundation for the follow-up research and the research data of the spherical 3-DOF parallelmechanism.
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