PM Synchronous Motor Drive Segmentation for Elevator Power
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Solution Overview
Problem
Elevator systems face challenges in providing high power drives for large loads due to the high costs and lengthy development times associated with specialty components, and existing large drives are often not available or are excessively costly.
Innovation Solution
A permanent magnet synchronous motor drive system with multiple phases and motor drives, where each phase is independently powered to deliver torque and flux current, with a primary motor drive controlling velocity and establishing field orientation angles for secondary drives, allowing for efficient power distribution and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single large high power drive is used to power the elevator machine for large loads, then the elevator can handle large duty or load, but the costs become excessive due to specialty components and component availability
Solution Approach 1:
The patent divides a single high-power drive system into multiple lower-power drive units (e.g., three 100HP drives instead of one 300HP drive). Each drive unit independently powers a portion of the motor phases, enabling the elevator to handle large loads through combined output while avoiding the high costs associated with specialty components in single large drives.
2Power
If a single large high power drive is used, then sufficient power is provided for large loads, but design costs and development time increase
Solution Approach 1:
By segmenting the drive system into multiple standard-power units, the patent eliminates the need for lengthy development cycles required for custom high-power drives. Each drive unit can be developed and tested independently using proven technologies, significantly reducing overall development time while still achieving the required total power output.
3Ease of manufacture
If multiple motor drives are used to power the elevator machine, then cost-effective power management is achieved, but system complexity increases
Solution Approach 1:
The patent combines multiple independent motor drives into a unified control system that manages them as a single integrated unit. The controller coordinates the operation of all drive units, balancing their output and synchronizing their operation, thereby managing system complexity while maintaining the cost advantages of using multiple standard-power drives.
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 enables cost-effective and efficient power management for elevator systems, utilizing smaller motors while maintaining control and efficiency, reducing design and operational costs.
Implementation Method 1
a permanent magnet (PM) synchronous motor operatively connected to the car
Implementation Method 2
permanent magnet (PM) synchronous electric motor
Data Source
AI summary
An elevator drive system (40) includes a permanent magnet (PM) synchronous electric motor (34) including a plurality of phases and a plurality of motor drives (55, 58) electrically connected to the PM synchronous electric motor. Each of the plurality of motor drives is operatively connected to a corresponding one of the plurality of phases. The plurality of motor drives is configured and disposed to deliver a torque current divided equally between each of the plurality of phases and independently deliver flux current to the corresponding one of the plurality of phases.