Stator Support Arm Isolation Mounts for Brushless DC Motor Vibration
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Solution Overview
Problem
Conventional brushless DC motors in tape drives experience torque oscillations, which cause instability in the spacing between the magnetic tape head and the magnetic medium, leading to position error signals and reduced performance as tape drive capacities increase.
Innovation Solution
The implementation of a stator support arm with isolation mounts, specifically using viscoelastic materials to dampen vibrations and reduce the transfer of oscillations from the stator to the support plate and other components, thereby maintaining stable spacing and improving read/write accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator is rigidly coupled to the main support plate in conventional brushless DC motors, then structural stability is improved, but torque oscillations are transmitted to the magnetic head causing spacing instability and position errors
Solution Approach 1:
The patent introduces a stator support arm as an intermediary component between the stator and the main support plate. This arm provides mechanical support for the stator while isolating it from direct rigid coupling to the main support plate, thereby preventing torque oscillations from being transmitted to the magnetic head assembly and maintaining stable spacing during tape operations.
2Strength
If the stator is rigidly coupled to the main support plate, then mechanical support is improved, but vibration transfer to the tape head increases causing position error signals
Solution Approach 1:
The stator support arm serves as a mediator that provides necessary mechanical support to the stator while filtering out harmful vibrations. By positioning the magnetic head assembly on the main support plate rather than directly coupling the stator to it, the system maintains structural strength while reducing vibration transfer that causes position error signals.
3Productivity
If brushless DC motors are used to achieve high speed tape motion in compact form factor, then productivity is improved, but torque waveform oscillations are generated affecting position accuracy
Solution Approach 1:
The stator support arm acts as an intermediary that enables the use of high-speed brushless DC motors in compact form factors while mitigating their torque waveform oscillations. This intermediate structure allows the motor to drive the tape at high speeds for improved productivity while preventing these oscillations from reaching the magnetic head, thereby maintaining position accuracy during high-speed operations.
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 configuration effectively reduces the impact of torque oscillations on the tape drive environment, enhancing the accuracy and efficiency of magnetic head operations by isolating vibrational disturbances and maintaining stable positioning.
Implementation Method 1
at least one isolation mount coupled between a second end of the stator support arm and the stator for reducing transfer of vibration from the stator to the stator support arm
Implementation Method 2
The isolation mount is coupled between a second end of the stator support arm and the stator for reducing transfer of vibration from the stator to the stator support arm
Implementation Method 3
The legs provide a magnetic path that couples with a sub-assembly, and is thereby able to induce a relative rotational movement between the sub-assembly and the stator. Specifically, the coupling of the magnetic paths to the magnetic field generated by the coils wrapped around the stator legs create a torque
Implementation Method 4
The coupling of the magnetic paths to the magnetic field generated by the coils wrapped around the stator legs create a torque which thereby includes the rotational motion which may selectively be used to transport tape from supply reel to take-up reel
Data Source
AI summary
An apparatus, according to one embodiment, includes: a support plate, a stator, and a stator support arm. The stator support arm has a first end that is coupled to the support plate, and extends from the support plate to the stator. Moreover, the stator is coplanar with the support plate. The apparatus further includes at least one isolation mount, and a rotor sub-assembly. The isolation mount is coupled between a second end of the stator support arm and the stator for reducing transfer of vibration from the stator to the stator support arm. The rotor sub-assembly includes a magnet, and a hub rotatably fixed relative to the magnet. Furthermore, the rotor sub-assembly is configured to rotate relative to the support plate and the stator. Other systems, methods, and computer program products are described in additional embodiments.