Integrated BLDC Motor Brake for Freewheeling Prevention
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Solution Overview
Problem
BLDC motors tend to freewheel when power is turned off, requiring additional mechanisms like stepper motors that add space and electrical stress, potentially damaging control electronics.
Innovation Solution
A self-braking BLDC motor system with an integrated solenoid actuator that engages the brake when power is off, using parallel windings to supply power to both the stator and brake windings, allowing the brake to disengage when power is on, eliminating the need for external control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stepper motor is added to engage and disengage mechanical brakes for BLDC-driven systems, then freewheeling is addressed, but additional space and hardware/software are required
Solution Approach 1:
The brake windings are integrated directly into the stator assembly of the BLDC motor, merging the braking function with the motor structure. This eliminates the need for separate stepper motors and external brake control systems, reducing device complexity while maintaining reliable freewheeling prevention through the integrated brake mechanism
Solution Approach 2:
The stator assembly is designed to serve multiple functions: generating rotational magnetic fields for motor operation and providing brake windings for freewheeling prevention. This multi-functionality eliminates the need for dedicated separate components, reducing overall system complexity while addressing the freewheeling issue
2Reliability
If a stepper motor is added to control the brake, then freewheeling is prevented, but additional space is required
Solution Approach 1:
The brake windings are consolidated within the stator assembly, merging the braking function into the existing motor structure. This integration eliminates the need for separate stepper motor components and external brake mechanisms, significantly reducing the space required while maintaining effective freewheeling prevention
3Reliability
If frequent use of the stepper motor is made to control the brake, then freewheeling is addressed, but electrical overstress may damage control electronic componentry
Solution Approach 1:
The brake windings are directly integrated into the stator assembly and powered by the same drive circuit that controls the motor phases. This self-service arrangement allows the brake to be controlled directly by the motor drive without requiring separate stepper motor control electronics, eliminating the electrical overstress issue while maintaining reliable freewheeling prevention
Solution Approach 2:
The control circuitry for the brake is merged with the existing motor drive circuit, eliminating the need for separate stepper motor control electronics. This integration reduces the risk of electrical overstress by using the already-stressed motor drive circuit instead of adding vulnerable separate control components
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 system effectively prevents freewheeling without additional hardware, reducing electrical stress and maintaining precise rotor control.
Implementation Method 1
the stator is configured to be energized from a power source and operable, upon receiving power, to generate a rotating magnetic field that causes the rotor to rotate
Implementation Method 2
the at least one motor brake is configured to move between a disengaged position when the at least one brake winding is energized, and an engaged position when the at least one brake winding is de-energized
Implementation Method 3
the biasing arrangement includes a spring
Data Source
AI summary
A device may include a rotor and a stator comprising a plurality of stator windings. A device may include at least one motor brake comprising at least one brake winding, wherein the at least one motor brake is configured to move between a disengaged position when the at least one brake winding is energized, and an engaged position when the at least one brake winding is de-energized, wherein the at least one motor brake inhibits a rotation of the rotor when in the engaged position. A device may include a drive circuit configured to deliver the power from the power source to the stator and to the at least one brake winding, wherein the drive circuit is configured to deliver power to the at least one brake winding, wherein the at least one brake winding is energized when the stator is energized.