In-Wheel Motor Wheel Balancing Without External Adaptors
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Solution Overview
Problem
Conventional wheel balancing machines are not equipped to handle rim-wheels with in-wheel motors, and they balance the combination of wheel, tire, and adaptor instead of the intended combination of rim-wheel, tire, and in-wheel motor, leading to inefficiencies and additional weight with the use of adaptors.
Innovation Solution
Integrating the in-wheel electric motor as the balancing motor with a permanently mounted imbalance sensor on the stator and orientation sensor on the wheel assembly, allowing for on-board balancing of the tire and wheel assembly, including the in-wheel motor, using a control unit to process data and determine the necessary balance weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wheel balancing machines are used with adaptors for rim-wheels with in-wheel motors, then the wheel assembly can be balanced, but additional weight and complexity are introduced due to the adaptors
Solution Approach 1:
The in-wheel motor serves dual purposes: as the propulsion motor and as the balancing motor. The motor spins the wheel assembly during balancing operations, eliminating the need for separate balancing machine motors and adaptors. This self-service approach integrates the balancing function into the existing motor structure.
Solution Approach 2:
The in-wheel motor is designed to perform multiple functions: it acts as both the propulsion motor for vehicle movement and the balancing motor for wheel balancing operations. The motor's rotor serves as both the drive element and the balancing reference element, eliminating the need for dedicated balancing equipment.
2Adaptability or versatility
If conventional wheel balancing machines are used with adaptors, then balancing can be performed, but the device complexity increases due to additional components
Solution Approach 1:
The balancing system merges the motor function and balancing function into a single integrated system. The in-wheel motor's rotor serves as both the propulsion element and the balancing reference, combining what would traditionally be separate systems into one unified structure.
Solution Approach 2:
The in-wheel motor provides its own spinning capability for balancing operations, eliminating the need for external balancing machine motors. The motor's existing control system is utilized to spin the wheel assembly at required speeds for imbalance measurement.
3Productivity
If external balancing machines are used, then wheel balancing can be performed, but time is lost due to removal and installation of adaptors
Solution Approach 1:
The wheel assembly with in-wheel motor is self-sufficient for balancing operations. The motor can be directly activated to spin the wheel for balancing without requiring attachment to external balancing machines, eliminating the time-consuming steps of adaptor installation and removal.
Solution Approach 2:
The in-wheel motor is pre-integrated into the wheel assembly design, so the balancing capability is already prepared and available. No additional setup or adaptor installation is needed before performing balancing operations, as the system is pre-configured for self-balancing.
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
Enables efficient balancing of the tire and wheel assembly, including the in-wheel motor, directly on the vehicle, reducing the need for external balancing machines and adaptors, thus minimizing weight and space requirements while accurately addressing imbalances.
Implementation Method 1
the in-wheel electric motor showing a stator and a rotor... On the stator electrical coils generate a rotating electro-magnetic field, while the rotor has a number of permanent magnets. The interaction between the rotating electro-magnetic field and the permanent magnets exert a torque on the rotor, resulting in a rotation of the wheel assembly.
Implementation Method 2
the imbalance sensor may, for example, be a vibration sensor, a velocity sensor or an acceleration sensor
Data Source
AI summary
The invention relates to a method of balancing a wheel assembly of an electric car, in which the wheel assembly comprises an in-wheel motor. The wheel assembly (with the tire mounted on it) is spun by the in-wheel motor, the imbalance is measured by a sensor on the wheel and the angular orientation is determined by an orientation sensor. A control unit in the car then determines the position and weight needed for balancing the wheel.