Multispeed AC Motor Circuit with Segmented Windings
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Solution Overview
Problem
Refrigeration fan motors in low wattage ranges, typically used in commercial and residential markets, have traditionally been inefficient, operating at efficiencies around 12%-26%, necessitating enhancements to improve their performance.
Innovation Solution
A multispeed alternating current (AC) machine circuit is developed, incorporating multiple pairs of power switches and windings, along with a control circuit to manage current flow, and a non-collapsing DC power supply component to prevent voltage collapse, allowing for efficient operation across different speed settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional low-wattage AC motors are used, then the device complexity is low, but the energy efficiency is poor (12%-26% efficient)
Solution Approach 1:
The motor circuit is segmented into multiple independent winding sets (first winding, second winding, third winding, fourth winding) that can be selectively activated. Each winding can be controlled by separate power switches, allowing the motor to operate in different configurations for improved energy efficiency across various load conditions.
Solution Approach 2:
The motor circuit incorporates dynamic switching capabilities through power switches (first power switch, second power switch, third power switch, fourth power switch) that can change the circuit configuration in real-time. This allows the motor to adapt its operation mode between full-speed and fractional-speed operation, optimizing energy efficiency dynamically based on operational requirements.
2Use of energy by moving object
If multiple power switches and windings are added to improve efficiency, then energy efficiency improves, but the device complexity increases
Solution Approach 1:
The motor circuit is designed with multi-functionality where the same set of windings and power switches can operate in multiple modes. The first and second windings can operate together for full-speed operation, while the third and fourth windings can operate for fractional-speed operation, allowing a single circuit to serve multiple operational purposes without requiring separate motor units.
Solution Approach 2:
The circuit merges multiple winding sets and power switch configurations into a unified motor structure. The control circuit integrates the switching logic for all power switches, and the windings are positioned on the motor stator to work together, combining what would traditionally require separate motor units into a single integrated system.
3Productivity
If fractional speed operation is enabled through multiple windings, then productivity control is improved, but the device complexity increases
Solution Approach 1:
The control circuit incorporates feedback mechanisms through sensors (such as Hall effect sensors or back-EMF detection) that monitor the motor's operational state. This feedback allows the control circuit to automatically adjust the switching of power switches and select appropriate winding configurations to achieve desired speed levels, enabling precise productivity control without requiring complex manual intervention.
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
The solution enhances the efficiency of refrigeration fan motors by enabling fractional and full speed operations, reducing energy consumption, and improving motor control reliability, thereby addressing the inefficiencies of traditional low-wattage motors.
Implementation Method 1
one or more windings, and a control circuit to close one pair of power switches to cause current to flow from a first side of the AC power source, through the one or more windings, to the second side of the AC power source
Data Source
AI summary
A system is for a machine having an alternating current (AC) power source with a first side and a second side, one or more windings, an AC polarity detector, a Hall effect device, two or more pairs of power switches, and a motor controller. The motor controller determines which of the power switches to open or close to obtain a direction of current flow through the one or more windings based on signals from the AC polarity detector and the Hall effect device.