| 摘要 |
<p>Electrically operated dual-motor drive systems for industrial vehicles. In the prior art protection from current overload resulting from high torque low speed operation involved increased circuit complexity resulting from additional protective circuitry or increased cost resulting from the use of high current transistors. The invention comprises an electrically operated dual-motor drive system of the type having differentially variable left and right traction motor circuits (10, 12) including left and right variable duty cycle power switches (20, 22) connecting the motors (14, 16) independently to a power source (18), left and right auxiliary switches (28, 36) in series with the traction motor circuits for complemental operation of same and a selectively operated shunt switch (64) which connects the power transistors (20, 22) in parallel for high torque, low speed operating conditions. Thus the disclosed invention protects the system from overload by using existing dual motor circuit components and avoids added circuit complexity or the extra cost of high current rated transistors.</p> |
