Domestic Appliance Drive Unit With Unified Multi-Motor Control
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Solution Overview
Problem
Existing electric drive systems for hydraulic pumps in water-bearing domestic appliances are complex and require separate control systems for each motor, leading to increased complexity and potential for hum noise due to operating voltage ripple.
Innovation Solution
A controllable converter system that provides a multiphase voltage supply, allowing a single control device to manage multiple electric motors, including permanent magnet excited synchronous motors, for hydraulic pumps and other components like blower and valves, eliminating the need for complex sensor systems and separate controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control systems are used for each motor in hydraulic pumps, then each motor can be controlled independently, but the overall system complexity increases
Solution Approach 1:
The patent combines multiple motor control functions into a single integrated control system. The control unit receives signals from sensors and controls multiple motors (circulating pump motor, drain pump motor, blower motor) through unified control logic, eliminating the need for separate control systems for each motor while maintaining independent control capability.
Solution Approach 2:
The control unit is designed as a universal controller that can manage different types of motors and functions (circulating pump, drain pump, blower) through a single device. This multi-functional approach allows one control system to perform what previously required multiple separate control systems.
2Object-generated harmful factors
If DC voltage motors are used to eliminate hum noise, then operating voltage ripple is reduced, but the system requires complex sensor systems and separate controllers
Solution Approach 1:
The patent uses DC voltage motors for all hydraulic pump motors to eliminate hum noise, and combines their control into a single control system that manages multiple motors without requiring separate controllers for each motor, thus reducing overall system complexity while maintaining noise reduction benefits.
3Measurement precision
If multiple sensors and actuators are connected to the control unit, then motor control precision is improved, but the control system becomes more complex
Solution Approach 1:
The control unit is designed as a universal controller that handles multiple sensors and actuators through integrated control logic. It manages water level sensors, pump motors, and blower motor through a single control system with unified processing, reducing the complexity that would arise from having separate control systems for each function.
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
Simplifies electronic motor management, reduces noise, and provides a uniform supply system for hydraulic pumps and other components, enhancing safety and efficiency by eliminating the need for speed sensors and separate controllers, while preventing idling noise and blocked state detection.
Implementation Method 1
at least one electric motor which is implemented in particular as a permanent magnet excited synchronous motor for driving a hydraulic pump
Data Source
AI summary
An electric drive unit for a water-bearing domestic appliance having a converter to provide a supply voltage from a multiphase voltage system; a control device to control the converter in order to operate a first electric motor connected to the multiphase voltage system; a load-current-carrying DC link arranged upstream of the converter; and an electrical device connected to at least part of the multiphase voltage system or the load-current-carrying DC link via a connection device, wherein the electrical device has a second electric to operate a hydraulic pump and/or a blower and/or a valve.