1. Torque is measured by equilibrant method in virtue of torque transducer and torsional angle is measured in virtue of photoelectric coder on conventional experimental machine.

2. By equilibrant theory study has been carried out for the causation to improve the oriented capability of the new type bogie to passing through the curve line.

3. Choosing proper equilibrant action point, we can have the moment of force to be balanced as the centrifugal force is countera...

4. Temperature drift of electromagnetic equilibrant transducer are analysed, the efficient compensation for the permanent magnet, the length and the resistance of the movable coil are introduced.

5. The mathematics model of the error is built. The best position and value of the equilibrant are calculated through optimizing.