Bidirectional Pump Motor Restart Control for Hydraulic Efficiency
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Solution Overview
Problem
High-hydraulic-efficiency centrifugal pumps require expensive electronic or electromechanical devices to control the rotation direction of bidirectional synchronous motors, leading to increased costs and complex installations, which are not feasible for household washing machines.
Innovation Solution
A method that periodically interrupts and restarts the power feeding of a bidirectional motor to increase the probability of starting in the direction corresponding to the highest hydraulic efficiency, eliminating the need for additional direction-control devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic or electromechanical devices are used to control the rotation direction of bidirectional synchronous motors, then the hydraulic efficiency of the centrifugal pump is improved, but the device complexity and cost increase
Solution Approach 1:
The patent removes the complex electronic or electromechanical direction-control devices from the system. Instead of adding control mechanisms, the invention uses the natural bidirectional starting capability of synchronous motors combined with periodic power interruption to achieve the desired rotation direction without any auxiliary control devices.
Solution Approach 2:
The synchronous motor's inherent bidirectional starting capability is utilized without external control. The motor naturally starts in either direction, and the system leverages this self-service property by periodically interrupting power to increase the probability of starting in the optimal direction, eliminating the need for external direction-control devices.
2Reliability
If electronic or electromechanical devices are used to control the rotation direction of bidirectional synchronous motors, then the hydraulic efficiency of the centrifugal pump is improved, but the production and application cost increases
Solution Approach 1:
The patent removes the expensive electronic or electromechanical direction-control devices from the system. Instead of adding control mechanisms, the invention uses the natural bidirectional starting capability of synchronous motors combined with periodic power interruption to achieve the desired rotation direction without any auxiliary control devices.
Solution Approach 2:
The patent replaces expensive electronic or electromechanical direction-control devices with a simple, low-cost control method based on periodic power interruption. This approach uses minimal additional components (essentially just a timer or control circuit) to achieve the same hydraulic efficiency improvement, dramatically reducing both production and application costs.
3Reliability
If mechanical or electromechanical devices are used to impose a desired rotation direction to the motor, then the hydraulic efficiency of the centrifugal pump is improved, but the installation complexity and bulk increase
Solution Approach 1:
The patent removes the complex electronic or electromechanical direction-control devices from the system. Instead of adding control mechanisms, the invention uses the natural bidirectional starting capability of synchronous motors combined with periodic power interruption to achieve the desired rotation direction without any auxiliary control devices.
4Reliability
If mechanical or electromechanical devices are used to impose a desired rotation direction to the motor, then the hydraulic efficiency of the centrifugal pump is improved, but the device size increases
Solution Approach 1:
The patent removes the complex electronic or electromechanical direction-control devices from the system. Instead of adding control mechanisms, the invention uses the natural bidirectional starting capability of synchronous motors combined with periodic power interruption to achieve the desired rotation direction without any auxiliary control devices.
Data Source
AI summary
A method for starting a motor (14) with a bidirectional rotation direction, to rotate a fluid circulation centrifugal pump (10) having a predetermined optimum hydraulic efficiency depending on the starting rotation direction thereof. The method provides an initial motor (14) starting in either rotation direction, with subsequent pump (10) rotation in the same direction and, subsequently, a periodical interruption and restoration of the motor (14) power feeding as many times (N, N′) as to ensure the motor (14) starting, at least one or more times within a predetermined time interval (Ttot, Ts), in the rotation direction which corresponds to the predetermined pump (10) optimum hydraulic speed.