BLDC Actuator Control with Adaptive Thresholds
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Solution Overview
Problem
Brushless direct current (BLDC) motors in mobile equipment actuators face risks of demagnetization, short circuits, and excessive torque due to improper power supply synchronization, which existing control systems fail to adequately protect against.
Innovation Solution
A method involving synchronized sampling of electrical power signals to detect anomalies using two protection criteria: instantaneous checks for pulse values and temporal checks for representative quantities, with adaptive threshold values based on operating modes to prevent demagnetization and excessive torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive threshold values based on operating modes are used, then protection accuracy under varying conditions is improved, but system complexity increases
Solution Approach 1:
The protection thresholds are made dynamic by adapting them according to the motor's operating mode. The system automatically adjusts the first and/or second thresholds based on whether the motor is in starting mode, steady-state mode, or other operating conditions. This dynamic adaptation maintains high protection accuracy across varying operational contexts without requiring manual reconfiguration.
Solution Approach 2:
The system changes the parameter values of the protection thresholds based on operating mode. Different threshold values are applied for different operating conditions (e.g., higher thresholds during starting mode when high currents are normal, lower thresholds during steady-state operation). This parameter adaptation allows accurate protection without false alarms across the full operating range.
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 method effectively protects BLDC motors by detecting and preventing anomalies such as high currents and excessive torque, ensuring safe operation and extending the lifespan of motor components.
Implementation Method 1
the electromagnetic field generated by the successive power supply to the windings must be synchronized with the position of the rotor
Implementation Method 2
have an instantaneous signal representative of the electrical power supplied to the motor
Data Source
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AI summary
A method for controlling and/or protecting an actuator of a piece of mobile equipment of a building, the actuator comprising a motor, comprises the steps consisting of: (E1) providing an instantaneous signal representative of the electrical power provided to the motor, (E2) carrying out a sampling of values of the instantaneous signal, (E3) performing a control of each sampled value according to a first protection criterion of the actuator, and issuing a first piece of anomaly information for each sampled value that does not satisfy the first criterion, (Ε3') acquiring a set of values from the sampled values, (Ε4') performing a control according to a second protection criterion of the actuator applied to all of the acquired sampled values, and issuing a second piece of anomaly information for all of the acquired sampled values that do not satisfy the second protection criterion.