The Design And Control Of Permanent Motor Used In Tail Rotor’s Configuration Test Rig

Helicopters play a large role in both fields of national defense and economic construction. Ahelicopter tail rotor has a similar structure with a rotor wing, except the tail-free technique. The tailrotor, which is placed in the tail beam, is an essential component used for balancing the counterforcemoment of rotor wing and making the direction operable and stable. In order to improve theaerodynamic performance and efficiency of tail rotor and reduce the noise, it is of great importance todevelop a novel tail rotor. Tail rotor’s configuration test rig provides an experimental platform fortesting performance parameters of a tail rotor. This paper is tried to design a motor speed regulationsystem to provide a proper power and drag the operation of the test rig.Firstly, the paper analyzed all the technical targets of the test rig and chose the alternating currentgovernor system of permanent-magnet synchronous motor (PMSM)as our systemic drag program.Besides, the paper reviewed the latest research status and development prospects of PMSM andanalyzed PMSM’s design approach and theory. On this basis of theoretical design approach, we madethe electromagnetic design of PMSM used for the test rig. After that, we calculated parameters ofelectric machine by use of design software RMxprt which is based on equivalent magnetic circuit andcircuit layout and finally inspected and verified the electromagnetic design.Secondly, by use of finite-element analysis software, we made simulation calculations formagnetic parameters and deeply analyzed PMSM’s air gap field. After optimizing permanent-magnetshape, air gap field should be closer to sinusoidal distribution. Besides, we expanded our research tomathematic calculations for the optimal offsetting of permanent-magnet. Compared to finite-elementanalysis method, this approach largely reduced the calculation time. By taking advantage of Ansoftand Magnet, we then made simulation analysis of steady-state constants and cogging torque of electricmachine and calculations for key parameters.Finally, we designed the system for controlling and monitoring PMSM. We wrote PLC controlprogram with programmable logic devices PLC as Mctr and then made communications byProfibus-DP fieldbus and monitoring computer. Host computer monitoring software was programmedby Visual C++, and could be used for long-range system control. At last, we debug the whole systemand made sure it perform well.