Electric control variable radial plunger motor and control method thereof

By using the dynamic flow distribution regulation and hydrostatic suspension control of the electronically controlled variable radial piston motor, the problems of fluid dynamic response and internal leakage of the radial piston hydraulic motor under extreme working conditions are solved, achieving smooth operation and low loss across the entire speed range.

CN122447249APending Publication Date: 2026-07-24NINGBO OUYI HYDRAULIC CO LTD
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Patent Information

Application Number
CN202610902837.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing radial piston hydraulic motors cannot achieve dynamic compensation of the flow distribution window under extreme operating conditions, resulting in short fluid dynamic response time, causing hydraulic pulsation and cavitation. Furthermore, under low speed and heavy load, they cause oil leakage between high and low pressure chambers, weakening the stability of torque output.

Method used

An electronically controlled variable radial piston motor is used. The spindle speed signal is collected in real time through the feedback module, and the distribution advance angle of the rotating distribution shaft is dynamically adjusted. Combined with hydrostatic suspension control and electro-hydraulic proportional execution module, the adaptive distribution timing and stepless precision adjustment of the displacement are realized.

Benefits of technology

Under high-speed or overspeed conditions, the dynamic adjustment of the flow advance angle suppresses hydraulic pulsation, reduces oil leakage under low-speed heavy load, ensures smooth operation of the motor across the entire speed range, reduces mechanical friction loss, and improves detection accuracy and response speed.

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Abstract

The invention discloses an electronic control variable radial plunger motor and a control method thereof, and relates to the field of hydraulic transmission devices, and the electronic control variable radial plunger motor is characterized by comprising a shell, a main shaft, a plurality of plunger bodies, a sealing cover, a flow distribution shaft cover, a dynamic flow distribution module, a feedback module and a controller. A rotating speed detection unit of the feedback module is arranged at the end of the spindle to collect rotating speed. The dynamic flow distribution module comprises a rotary flow distribution shaft with the circumferential rotation freedom degree and a flow distribution actuator. And the controller indicates the flow distribution actuator to drive the rotary flow distribution shaft to generate circumferential deflection based on the rotating speed signal, so that the dynamic adjustment of the flow distribution advance angle is realized. The flow distribution advance angle is increased at a high speed for phase compensation, and transient pressure pulsation and cavitation erosion are restrained; and the flow distribution advance angle is reduced during ultra-low-speed heavy load, oil intermingling and internal leakage of the high-pressure cavity and the low-pressure cavity are blocked, the torque output is kept stable, and the operation stability and efficiency of the motor under variable working conditions are remarkably improved.
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