| US 7,477,033 B2 | ||
| Rotation drive system having a speed reduction device with elastic bodies | ||
| Hiroshi Abe, Kobe (Japan) | ||
| Assigned to Kyocera Mita Corporation, Osaka (Japan) | ||
| Filed on Oct. 02, 2006, as Appl. No. 11/541,909. | ||
| Claims priority of application No. 2005-287557 (JP), filed on Sep. 30, 2005. | ||
| Prior Publication US 2007/0075666 A1, Apr. 05, 2007 | ||
| Int. Cl. H02P 8/14 (2006.01) | ||
| U.S. Cl. 318—433 [318/9; 318/685] | 11 Claims |
| 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.
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