Hydraulic-Electric Analogies: DC Motors and Hydraulic Motors (.PDF Download)

Given that a series-connected electric dc motor and a pressure-compensated hydraulic motor have the same speed and torque ratings, they will both display essentially the same torque-speed characteristic curves. A generalized torque-speed curve applying to both motor types is shown in Fig. 1. The predictable reactions in the two motors reveal why that is possible.

Series-Connected DC Motor

The series-connected dc electric motor (Fig. 2) was in

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