Electronic Control for Rotary Fluid Device Torque

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Solution Overview

Problem

Hydraulic systems with mechanical pressure compensation devices face challenges of increased complexity, cost, and weight, necessitating a method to control torque or horsepower without these devices.

Innovation Solution

A fluid device system incorporating a fluid pump, an electric motor, and a controller with a lookup table that adjusts electrical signals to the motor based on performance characteristics to achieve desired attributes, such as constant horsepower or pressure compensation, eliminating the need for mechanical compensation devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If mechanical pressure compensation devices (yokes, springs, mechanical valves) are used to control torque or horsepower output, then the hydraulic pump can effectively control torque or horsepower, but the system complexity, cost, and weight increase

Engineering Contradiction:

Improvetorque or horsepower controlVSAvoidsystem complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent replaces mechanical pressure compensation devices with an electric motor and electronic control system. The electric motor drives the hydraulic pump, and a controller with lookup tables electronically adjusts motor parameters (voltage, current, phase angle) to control pump torque and horsepower output, eliminating mechanical valves, springs, and yokes from the system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent controls hydraulic pump torque and horsepower by changing electrical parameters of the motor (voltage, current, phase angle) based on operating conditions stored in lookup tables. This allows dynamic adjustment of motor output parameters to achieve desired pump torque control without mechanical compensation devices.

Inventive Principle:

Principle #35Parameter changes

2Power

If mechanical pressure compensation devices are used to control torque or horsepower output, then the hydraulic pump can effectively control torque or horsepower, but the system cost increases

Engineering Contradiction:

Improvetorque or horsepower controlVSAvoidsystem cost

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent replaces expensive mechanical pressure compensation devices with an electric motor and electronic control system. The controller with lookup tables provides cost-effective torque control by electronically adjusting motor parameters rather than using complex mechanical valve assemblies, springs, and yokes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Power

If mechanical pressure compensation devices are used to control torque or horsepower output, then the hydraulic pump can effectively control torque or horsepower, but the system weight increases

Engineering Contradiction:

Improvetorque or horsepower controlVSAvoidsystem weight

Core Design Contradiction:

PowerVSWeight of stationary object

Solution Approach 1:

The patent replaces heavy mechanical pressure compensation devices (valves, springs, yokes) with a lighter electric motor and electronic control system. The motor's electromagnetic components and the controller's circuitry weigh significantly less than the mechanical compensation apparatus, reducing overall system weight while maintaining torque control capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution allows for effective control of torque or horsepower in hydraulic systems without mechanical pressure compensation, reducing complexity, cost, and weight while maintaining performance, by using an electric motor and controller to adjust electrical signals based on sensed parameters and lookup table data.

Implementation Method 1

The electric motor is adapted for rotation in response to an electric signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10100827B2Electronic control for a rotary fluid device

Publication Date: 2018.10.16 EATON INTELLIGENT POWER LTD

AI summary

A fluid device system includes a fluid pump, an electric motor in engagement with the fluid pump, and a controller. The electric motor is adapted for rotation in response to an electric signal. The controller is adapted to communicate the electric signal to the electric motor. The controller includes a lookup table having a plurality of performance data related to the fluid pump and the electric motor. The performance data from the lookup table is used by the controller to set aspects of the electrical signal communicated to the electric motor in order to achieve a desired attribute of the fluid pump.