Multi-rotor PMSM Parallel Mechanisms Eliminate Gearbox
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Solution Overview
Problem
Existing motor technologies for electric vehicles suffer from energy loss due to the use of gearboxes, which increase energy consumption and weight, and require large-capacity batteries to handle high-power starting, leading to increased risks.
Innovation Solution
A multi-rotor permanent magnet synchronous motor design that eliminates the need for a gearbox by using a main and auxiliary mechanism working in parallel, with auxiliary rotors and stators, and a rotary transformer, allowing for efficient torque and speed control without energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gearbox is used to transmit power, then torque multiplication is achieved, but energy loss increases
Solution Approach 1:
The motor is divided into multiple independent rotor-stator units (main mechanism and auxiliary mechanism) that work in parallel. Each unit can independently generate torque, eliminating the need for a gearbox to multiply torque from a single motor. This segmentation allows direct-drive operation while maintaining high torque output capability.
Solution Approach 2:
Multiple rotor-stator units are merged into a single integrated motor system with shared stator structures. The auxiliary mechanism's rotor-stator components are combined with the main mechanism, creating a unified motor that delivers combined torque output without requiring mechanical transmission through a gearbox.
2Loss of energy
If direct drive mode is used without gearbox, then energy loss is reduced, but high power and big torque requirements increase energy consumption
Solution Approach 1:
The motor is divided into multiple independent rotor-stator units (main mechanism and auxiliary mechanism) that work in parallel. Each unit can independently generate torque, eliminating the need for a gearbox to multiply torque from a single motor. This segmentation allows direct-drive operation while maintaining high torque output capability.
Solution Approach 2:
The auxiliary mechanism can be selectively engaged or disengaged based on operating conditions. During normal operation, only the main mechanism operates at lower power consumption. When additional torque is needed, the auxiliary mechanism activates to provide supplemental torque, avoiding continuous high energy consumption while maintaining the capability for high-torque output when required.
3Power
If large-capacity batteries are used to cope with high-power starting, then starting performance is improved, but vehicle weight increases
Solution Approach 1:
The auxiliary mechanism can be selectively engaged or disengaged based on operating conditions. During normal operation, only the main mechanism operates at lower power consumption. When additional torque is needed, the auxiliary mechanism activates to provide supplemental torque, avoiding continuous high energy consumption while maintaining the capability for high-torque output when required.
Solution Approach 2:
Multiple rotor-stator units are merged into a single integrated motor system with shared stator structures. The auxiliary mechanism's rotor-stator components are combined with the main mechanism, creating a unified motor that delivers combined torque output without requiring mechanical transmission through a gearbox.
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 motor achieves smooth and powerful driving without a gearbox, reducing energy consumption and enabling different torque and speed outputs, thereby enhancing efficiency and safety by minimizing battery size and weight.
Implementation Method 1
a rotary transformer silicon steel sheet, an auxiliary stator sleeved on the rotary transformer silicon steel sheet and a rotary transformer coil seat sleeved on the auxiliary stator
Implementation Method 2
the first auxiliary rotor and the second auxiliary rotor both comprise the second permanent magnet group
Implementation Method 3
the one-way bearing body comprises several one-way bearings, inner sleeves of one-way bearings and outer sleeves of one-way bearings
Data Source
AI summary
The present invention provides a multi-rotor permanent magnet synchronous motor, wherein the motor (100) includes a motor shaft (3) and the main mechanism (1) and the auxiliary mechanism (4) sleeved on the motor shaft (3) in turn which work in parallel; the auxiliary mechanism (4) includes a one-way bearing body (41) sleeved on the motor shaft (3) and auxiliary rotor components (40) sleeved on the one-way bearing body (41). The multi-rotor permanent magnet synchronous motor in the present invention does not need a gear box to drive, and the energy consumption is low. Besides, through the coordinative work of the main structure and the auxiliary mechanism, different torques can be output, so as to output different speeds.