Brake Pump Motor Rotor Positioning for Low-Torque Start-Up
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Solution Overview
Problem
Conventional driving dynamics control devices, such as ESP systems, require powerful and expensive electric motors to start up against high brake fluid pressures, leading to complex and costly designs.
Innovation Solution
A method and device that detect and adjust the position of the rotor relative to the stator to minimize the torque required for pump operation, allowing the electric motor to start up easily and efficiently, even at low power, by identifying an ideal position where the sum of torques is below a predefined limit, enabling a compact and economical design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is configured with high power to start up against maximum brake fluid pressure, then the motor can start up in any rotor position, but the motor becomes large, expensive, and complex
Solution Approach 1:
The control device determines the ideal rotor position in advance (where torque requirement is minimal) and actively positions the rotor at this ideal position before the motor needs to start up. This preliminary positioning ensures that when the motor starts, it operates under most favorable conditions with minimal torque requirement, allowing a smaller, less expensive motor to reliably start up
Solution Approach 2:
The system transitions from a static motor configuration (fixed power rating) to a dynamic control approach where the rotor position is actively adjusted based on operating conditions. The control device continuously monitors brake fluid pressure and rotor position, dynamically repositioning the rotor to maintain optimal start-up conditions regardless of system pressure levels
2Power
If the electric motor is configured with high power to ensure start-up at maximum pressure, then the motor can overcome high torque requirements, but the system becomes expensive and less compact
Solution Approach 1:
The system proactively positions the rotor at the ideal position before high-power operation is needed. By determining the ideal position where torque requirement is minimal and actively maintaining this position, the system enables a lower-powered motor to effectively handle high-pressure conditions without requiring an oversized motor design
Solution Approach 2:
The system changes the operational parameter of rotor position to optimize motor performance. By adjusting the rotor position parameter to the ideal position (where torque requirement is minimal), the system allows a motor with lower power rating to achieve the same effective performance as a high-power motor would provide at any position
3Speed
If the rotor is positioned at ideal position with minimal torque requirement, then the motor starts up quickly and easily, but additional control mechanisms are needed
Solution Approach 1:
The control device implements a feedback mechanism that continuously monitors the rotor position and brake fluid pressure. Based on this feedback, the control device determines whether the rotor is at the ideal position and adjusts the rotor position accordingly, creating a closed-loop control system that maintains optimal start-up conditions
Solution Approach 2:
The system uses the motor's own position detection capabilities and control mechanisms to self-adjust and maintain the ideal rotor position. The control device leverages existing system components (position detection, motor control) to automatically manage the rotor positioning without requiring external intervention or additional complex mechanisms
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 electric motor starts up quickly and reliably, supplying brake fluid rapidly, with reduced energy consumption and wear, while maintaining technical simplicity and compactness, thus addressing the need for efficient and cost-effective operation.
Implementation Method 1
an electric motor (30), in particular a brushless direct current motor, which includes a rotor and a stator for driving the pump elements
Data Source
AI summary
A method is provided for controlling a driving dynamics control unit for influencing the braking of wheels of a motor vehicle. The driving dynamics control device having a pump, which includes at least two pump elements for the supply of brake fluid, and an electric motor, which includes a rotor and a stator for driving the pump elements. The method includes the following steps: detecting the position of the rotor relative to the stator, and adjusting an ideal position of the rotor relative to the stator, the sum of the torques for moving the pump elements lying below a predefined torque limit value, in particular being minimal, in the ideal position.