Multiphase Motor Drive Unit Segmentation
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Solution Overview
Problem
The process of selecting and developing high-power drive units for conveyance systems, such as elevators, to handle varying load requirements is time-consuming and costly, as existing methods require sourcing and testing specific drive units for each machine load.
Innovation Solution
A conveyance system utilizing a multiphase permanent magnet synchronous motor with windings arranged in multiple phases and driven by a plurality of drives, where the number of drives is an integer multiple, allowing for flexible configuration of windings in series or parallel branches to provide efficient power distribution, reducing the need for high-power drive development and certification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-power drive unit is developed or sourced for higher load requirements, then the machine can handle higher loads, but the process is time-consuming and costly due to sourcing and testing requirements
Solution Approach 1:
The patent divides the multiphase motor windings into multiple independent phases (e.g., 6 phases for 12*k stator teeth and 11*k rotor poles, or 9 phases for 18*k stator teeth and 17*k rotor poles). Each phase can be controlled by separate drive units, allowing the system to handle higher loads by activating more phases rather than requiring a single high-power drive unit. This segmentation enables modular scaling of power capacity.
Solution Approach 2:
The patent creates a universal drive unit configuration that can serve multiple power levels through different winding connection arrangements. The same basic drive unit design can be adapted to handle various load requirements by changing how windings are connected (series, parallel, or combinations), eliminating the need to source and test different drive units for different power levels.
2Power
If a high-power drive unit is developed or sourced for higher load requirements, then the machine can handle higher loads, but the development and certification costs increase
Solution Approach 1:
By segmenting the motor into multiple phases that can be independently controlled, the system can achieve higher power output using standard, lower-power drive units. This avoids the need to develop and certify expensive high-power drive units, as each phase can be driven by conventional drive units that are already certified and cost-effective.
Solution Approach 2:
The patent uses multiple copies of standard drive units (one for each phase or group of phases) instead of a single custom high-power drive unit. This allows the system to scale power capacity by adding more standard drive unit copies rather than investing in custom high-power drive development and certification.
3Adaptability or versatility
If windings are arranged in multiple phases with multiple drives, then power distribution becomes more flexible and efficient, but the device complexity increases
Solution Approach 1:
The patent applies different winding connection configurations (series, parallel, or combinations) to different phases based on local requirements. For example, some phases may be connected in series to achieve higher voltage, while others use parallel connections for higher current capacity. This localized optimization provides flexible power distribution without requiring complex control of all phases uniformly.
Solution Approach 2:
The system allows dynamic reconfiguration of winding connections between series and parallel arrangements, enabling the drive unit to adapt its power distribution characteristics based on load requirements. This dynamic flexibility allows the same hardware configuration to serve multiple power levels without increasing physical complexity.
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 configuration reduces costs, provides redundancy, lowers torque ripple and noise, and minimizes core and solid losses, enabling efficient operation with improved power handling for higher loads without the need for custom high-power drive units.
Implementation Method 1
a multiphase permanent magnet synchronous motor with a 12*k stator teeth and 11*k rotor poles
Data Source
AI summary
A conveyance system includes a car; a machine for imparting motion to the car, the machine including a stator and a rotor, the stator including 12*k stator teeth, the rotor including 11*k rotor poles, wherein k is a natural even number, the machine including windings located at the stator teeth, the windings arranged in 6 phases; and a drive unit for providing drive signals to the machine, the drive unit including a plurality of drives, the number of drives being an integer multiple of 2.