Jack Johnson

Jack
L.
Johnson
Contribuitng Technical Expert,
IDAS Engineering Inc.

Jack Johnson is an electrohydraulic specialist, fluid power engineering consultant, and president of IDAS Engineering Inc., Milwaukee. Contact him at jack@idaseng.com, phone (414) 236-5350, or visit www.idaseng.com.

Articles
Hydraulic-Electric Analogies: Stepper Motors
Of all the analogies between hydraulic and electric components, probably none are more similar than those made with stepper motors.
Hydraulic-Electric Analogies: Internal Gear Pumps
Although usually associated with low-speed, high-torque motors, the gerotor element also works effectively as a pump.
Hydraulic-Electric Analogies: Part 2—Adding a Variable to Positive Displacement
Vane pumps are like the gear pumps described in last month’s issue in their capacity to produce positive displacement, but they go one step further with variable-displacement capability.
Hydraulic-Electric Analogies: Simple and Efficient
External gear pumps are widely used in hydraulics because of their simplicity and high efficiency. But because they are only available with fixed displacement, their efficiency decreases when transmitting less than full power.
Hydraulic-Electric Analogies: Hydraulic Power Conversion, Part 4
Achieving constant pressure and flow in hydraulics, or constant current and voltage with electricity, aren’t as straightforward as they may seem.
Hydraulic-Electric Analogies: Hydraulic Power Conversion, Part 3
Power generated by hydraulic systems exhibits current flow traits similar to those of its electrical counterparts.
Hydraulic-Electric Analogies: Hydraulic Power Conversion, Part 2
Power generated by hydraulic systems exhibits current flow traits similar to those of its electrical counterparts.
Hydraulic-Electric Analogies: Hydraulic Power Conversion, Part 1
Power generated from hydraulic-fluid systems exhibits similar ac current-flow traits like that of its electrical counterparts.
Hydraulic-Electric Analogies: Motors and Generators, Part 6
Understanding electrical behavior can improve your understanding of hydraulics. For example, a shunt-connected generator is perfectly analogous to a variable-displacement pump.
Hydraulic-Electric Analogies: DC Motors, Part 5
The analogous nature of hydraulic systems and their electrical counterparts can be compared and contrasted by examining motors and power conversion.
Hydraulic-Electric Analogies: Torque-Speed Behavior, Part 4
The analogous nature of hydraulic systems and their electrical counterparts can be compared and contrasted by examining motors and power conversion.
Hydraulic-Electric Analogies: Power Sources, Part 3
The analogous nature of hydraulic systems and their electrical counterparts can be compared and contrasted by examining motors and power conversion.
Hydraulic-Electric Analogies: Power Sources, Part 2
The analogous nature of hydraulic systems and their electrical counterparts can be compared and contrasted by examining motors and power conversion.
Hydraulic-Electric Analogies: Power Sources, Part 1
The analogous nature of hydraulics and their electrical counterparts becomes even more evident when examining motors and power conversion.
Hydraulic-Electric Analogies: Reservoirs and Grounds
Grounds in electrical circuitry and reservoirs in hydraulic systems often draw comparisons in concept, but they differ greatly in terms of design flexibility.
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