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Mechanical Resonance and the Frameless Motor Advantage: Part II
A flexible coupling between a servo motor and its load is a practical necessity with a framed motor, but it is also the primary source of mechanical resonance. In our last blog post [INSERT LINK], we walked through how resonance develops in the spring-mass system of motor and load, how it constrains servo loop bandwidth and why large load/motor inertia ratios make stable control difficult. Here we cover the mechanical and control techniques available to mitigate resonance, and why none of them match the performance of integrating a frameless motor directly into the load.
Mechanical Resonance and the Frameless Motor Advantage: Part I
When a servo motor connects to its load through a flexible coupling, the coupling introduces compliance into the drivetrain. That compliance creates a resonant condition that can cause unstable servo behavior or leave the load significantly lagging the motor. When load inertia is large relative to motor inertia, stable closed-loop control may not be achievable at all.
Sizing a Battery for an AGV/AMR: Part II
Correctly sizing an AGV/AMR battery can help avoid common pitfalls like oversizing, which can increase overall weight and cost. In our last blog post, we walked through the AGV power conversion chain and the losses at each stage. After understanding component efficiencies, the next task is to determine battery capacity from the motion profile.
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Mechanical Resonance and the Frameless Motor Advantage: Part II
A flexible coupling between a servo motor and its load is a practical necessity with a framed motor, but it is also the primary source of mechanical resonance. In our last blog post [INSERT LINK], we walked through how resonance develops in the spring-mass system of motor and load, how it constrains servo loop bandwidth and why large load/motor inertia ratios make stable control difficult. Here we cover the mechanical and control techniques available to mitigate resonance, and why none of them match the performance of integrating a frameless motor directly into the load.
Mechanical Resonance and the Frameless Motor Advantage: Part I
When a servo motor connects to its load through a flexible coupling, the coupling introduces compliance into the drivetrain. That compliance creates a resonant condition that can cause unstable servo behavior or leave the load significantly lagging the motor. When load inertia is large relative to motor inertia, stable closed-loop control may not be achievable at all.
Sizing a Battery for an AGV/AMR: Part II
Correctly sizing an AGV/AMR battery can help avoid common pitfalls like oversizing, which can increase overall weight and cost. In our last blog post, we walked through the AGV power conversion chain and the losses at each stage. After understanding component efficiencies, the next task is to determine battery capacity from the motion profile.
Meet the R-Series Nano: Compact Servo Drives for the Harshest Environments
We’re excited to introduce our new R-Series Nano — the R47 (CANopen) and R48 (EtherCAT) — for applications where size and mass are critical and the operating environment is unforgiving. Both servo drives are built on our proven NanoPlus platform and engineered to survive temperature extremes, vibration, shock and humidity.
Sizing a Battery for an AGV/AMR: Part I
Battery selection is one of the most critical AGV/AMR design choices, with major impact on performance and cost. Most battery selection procedures begin with a fixed energy budget, often determined early on in the overall design process. But because all losses within the drivetrain detract from the AGV/AMR’s available runtime, overcompensating for these losses can drive up battery size, weight and cost.
Reducing Current Ripple in Permanent Magnet Motors: Part 2
In our last blog post, we delved into how pulse width modulation (PWM) causes current ripple in permanent magnet (PM) motors and can lead to increased motor heating. Finishing our blog series, we offer strategies to reduce the magnitude of current ripple.