hydraulic motor
C2Technical/Engineering
Definition
Meaning
A mechanical actuator that converts hydraulic pressure and flow into rotational mechanical energy (torque and rotation).
A device powered by pressurized fluid, typically oil, used to drive machinery in various industrial, mobile, and marine applications. It is the rotary counterpart to a hydraulic cylinder.
Linguistics
Semantic Notes
The term is a compound noun where 'hydraulic' specifies the power source (fluid under pressure) and 'motor' specifies the function (rotary motion producer). It belongs to the semantic field of power transmission and fluid power systems.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling conventions follow standard UK/US patterns for related terms (e.g., 'pressurised' vs. 'pressurized').
Connotations
Identical technical connotations in both varieties.
Frequency
Equally frequent in technical contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The [NOUN] is powered by a hydraulic motor.A hydraulic motor drives the [NOUN].We need to replace the hydraulic motor on the [EQUIPMENT].Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Discussed in procurement, maintenance budgets, and equipment specifications.
Academic
Studied in mechanical engineering, fluid dynamics, and mechatronics courses.
Everyday
Virtually never used in casual conversation.
Technical
Core term in hydraulic system design, troubleshooting, and component selection.
Examples
By Part of Speech
verb
British English
- The winch is hydraulically motorised.
- We need to motorise the conveyor hydraulically.
American English
- The winch is hydraulically motorized.
- We need to motorize the conveyor hydraulically.
adjective
British English
- The hydraulic-motor drive is more robust.
- It's a hydraulic-motor application.
American English
- The hydraulic-motor drive is more robust.
- It's a hydraulic-motor application.
Examples
By CEFR Level
- The excavator uses a hydraulic motor to turn its tracks.
- A failure in the primary hydraulic motor caused the crane's rotation mechanism to seize.
- The system's efficiency was improved by replacing the fixed-displacement hydraulic motor with a variable-speed model, thereby reducing energy losses during partial-load operations.
Learning
Memory Aids
Mnemonic
Think of a water wheel (HYDRO) being turned by high-pressure water to create spinning power (MOTOR).
Conceptual Metaphor
A hydraulic motor is the MUSCLE of a hydraulic system, providing turning force.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque 'гидравлический мотор' as it is less common. The standard term is 'гидромотор' or 'гидравлический двигатель'.
Common Mistakes
- Confusing it with a 'hydraulic pump' (which creates flow, rather than using it).
- Using 'hydraulic engine' (incorrect; 'engine' typically refers to combustion).
Practice
Quiz
What is the primary function of a hydraulic motor?
FAQ
Frequently Asked Questions
A pump converts mechanical energy into hydraulic energy (flow and pressure). A motor does the reverse, converting hydraulic energy back into mechanical rotation.
Many hydraulic motors can be used as pumps in a reversed flow direction, but they are typically optimised for one primary function.
In heavy machinery (excavators, cranes), industrial manufacturing lines, marine winches, and anywhere high torque in a compact space is needed.
The main types are gear motors, vane motors, and piston motors (axial or radial), each with different performance characteristics for torque, speed, and efficiency.