Biomedical Engineering Reference
In-Depth Information
Figure 11.6
Isokinetic exercise machine with MR Fluid Break.
Figure 11.7
Systematic diagram of the equipment.
shaft, training controls up to 90 Nm given a maximum force of 27 Nm generated
by the MR fluid brake, for which see
Fig. 11.(5)
The MR fluid brake is activated by a servo-amplifier (SMCM10, Servoland
Corp., Japan) based on commands from a PC via a digital/analog (DA) conver-
sion board. Rotational angles of the brake output shaft are measured using an
incremental rotary encoder that measures up to 20000 ppm resolutions (5000 ppr
×
4) in one rotation, corresponding to resolutions of 0.005 deg at the handle via
the reduction unit (reduction ratio: 1/3.63). The handle's operating torque is mea-
sured using a torque converter (TP-10KCB, Kyowa Dengyo, Japan) intercalated on
the rotation shaft which is then input to the PC through the AD conversion board .
