Patent ID: 7477033
Filing Date: 2009-01-13
Classification: G03G

Abstract:
1. A rotation drive system having a speed reduction device with elastic bodies for reducing the rotational speed of a motor by means of frictional contact of the elastic bodies, comprising: a rotation control unit configured to output an input shaft speed signal to said motor, said input shaft speed signal allows said motor to rotate at a predetermined input shaft speed; a rotational speed detection unit configured to detect an output shaft speed reduced by said speed reduction device with elastic bodies and configured to output an output shaft speed signal; a load torque estimation unit configured to estimate a load torque by determining slippage in the speed reduction device based on a reduction ratio of the input shaft speed signal output by said rotation control unit and the output shaft speed signal detected by said rotational speed detection unit and based on a corresponding predetermined reduction ratio under no-load conditions; and a drive control unit configured to control said motor to produce a torque equivalent to the load torque estimated by said load torque estimation unit.