Braking Locking Means for Synchronous Machine Rotor
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Solution Overview
Problem
Brushless synchronous motors lack effective braking capability when power is absent, relying on uncontrolled mechanical load which is insufficient for many applications, and existing solutions like electromagnetic brakes are not suitable for self-driven synchronous motors.
Innovation Solution
A device with fixed elements on the rotor and stator generating radial magnetic fields, using permanent magnets to create static torque that immobilizes the rotor, independent of stator coil control, allowing for variable braking torque and effective immobilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If uncontrolled natural braking is used when stator coils cease to be supplied, then the motor brakes due to mechanical load, but the braking capacity is much lower than the real need
Solution Approach 1:
The patent introduces a braking disc as an intermediary element between the rotor and stator. The braking disc is attracted by electromagnetic fields generated by braking coils, creating a controllable braking force. This mediator allows the braking function to be decoupled from the motor control system while providing sufficient and controllable braking capacity.
Solution Approach 2:
The patent replaces the insufficient mechanical load-based braking with an electromagnetic braking system. By using electromagnetic fields to attract the braking disc, the system achieves controllable braking capacity that can meet real application needs, substituting the inadequate mechanical braking mechanism.
2Force
If electromagnetic brake is used in self-driven synchronous motors, then braking can be achieved, but the solution is not suitable for self-driven synchronous motors
Solution Approach 1:
The braking disc serves multiple functions: it acts as both a braking surface and a rotor element. The same disc that provides braking functionality also interacts with the motor's magnetic fields during operation. This multi-functionality allows the electromagnetic brake to be integrated into self-driven synchronous motors without requiring separate dedicated components.
3Device complexity
If braking function is linked to stator coil control, then electronic control manages both, but the blocking function becomes dependent on electrical supply
Solution Approach 1:
The patent separates the braking function from the motor control function. The braking coils are distinct from the motor coils, and the braking disc is a separate element. This segmentation allows the braking system to operate independently, providing reliable immobilization even when the electrical supply to the motor is interrupted or fails.
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 device provides complementary braking and immobilization, enhancing the motor's braking capacity by generating static torque through magnetic interactions, effective even without electrical supply, and adaptable to specific needs by varying the number and distribution of permanent magnets.
Implementation Method 1
means for generating magnetic fields attached to the first element cooperating with means for generating magnetic fields attached to the second element, said means generating radial field lines
Implementation Method 2
a first wall of the first element oriented in the direction of the stator is provided with at least one permanent magnet zone whose polarity direction is oriented radially
Implementation Method 3
When the coil(s) in question are energized, the magnetic fields they produce attract said braking disc, against spring means, away from the rotating rotor elements
Implementation Method 4
When they cease to be powered, these spring means urge the disk or more generally the braking means against the rotor, and block it
Data Source
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AI summary
A braking and locking device for the rotor of a self-piloted synchronous rotating machine of the brushless DC motor type. It comprises at least one first element (12, 22) fixed relative to the rotor and at least one second element (10, 20) fixed relative to the stator. Magnetic field generation means (15, 25) attached to the first element (12, 22) cooperate with magnetic field generation means (15, 25) attached to the second element (10, 20). Said means (15, 25) generate radial field lines and are located and positioned respectively in the first (12, 22) and in the second (10, 20) element such that radial lines of the same direction and sense are collinear in at least n (n > 1) predetermined discrete angular positions.