controller

Articles, guides, and products tagged "controller" — a combined view of every catalogue resource on this topic.

User guide

E-scooter privacy and personal data protection engineering: cross-cutting privacy-preservation axis — GDPR Regulation (EU) 2016/679 + ePrivacy Directive 2002/58/EC + EU Data Act Regulation (EU) 2023/2854 + UK Data Protection Act 2018 + California CCPA/CPRA + ISO/IEC 27701:2019 PIMS + ISO/IEC 29100:2024 Privacy Framework + ISO/IEC 29134:2017 PIA + IEEE 7002-2022 + NIST Privacy Framework v1.0

Engineering deep-dive into e-scooter privacy and personal data protection as the tenth cross-cutting infrastructure axis (privacy-preservation axis) — parallel to [fastener engineering as joining axis](@/guide/fastener-and-bolted-joint-engineering.md), [thermal management as heat-dissipation axis](@/guide/thermal-management-engineering.md), [EMC/EMI as interference-mitigation axis](@/guide/emc-emi-engineering.md), [cybersecurity as interconnect-trust axis](@/guide/cybersecurity-engineering.md), [NVH as acoustic-vibration-emission axis](@/guide/nvh-engineering.md), [functional safety as safety-integrity axis](@/guide/functional-safety-engineering.md), [battery lifecycle as sustainability axis](@/guide/battery-lifecycle-recycling-engineering.md), [reparability as repairability axis](@/guide/repair-and-reparability-engineering.md) and [environmental robustness as environmental-conditioning axis](@/guide/environmental-robustness-engineering.md). Covers: 11-row standards matrix (GDPR 2016/679 + ePrivacy 2002/58/EC + Data Act 2023/2854 + UK DPA 2018 + California CCPA/CPRA + LGPD Brazil + PIPL China + nFADP Switzerland + PIPEDA Canada + ISO/IEC 27701/29100/29134 + IEEE 7002-2022 + NIST Privacy Framework v1.0); GDPR Article 6 lawful bases applied to e-scooter telematics; Article 35 DPIA trigger matrix; Article 25 privacy-by-design + Cavoukian 7 foundational principles; personal data inventory 9-row matrix (GPS/IMU telemetry/user identity/BLE pairing/biometrics/payment/IP/device-ID/app analytics); Article 12-22 data subject rights 8-row table; Article 33-34 breach notification 72h timeline; international transfer (SCC 2021/914 + EU-US Data Privacy Framework Schrems II); 10-event real incidents timeline 2018-2026 (Lime data leak + Bird CNIL fine + Voi GDPR action + Bolt Texas data breach + DJI Avata PIPL + Apollo SDK Onavo-style telemetry + Helbiz S-1 disclosure + Spin SOC 2 + Beam DPIA + Tier consent withdrawal); industry shift 2020→2026; 8-step DIY user privacy audit; 16 numbered sections.

17 min read

User guide

Smooth acceleration and throttle control on an e-scooter: longitudinal weight-transfer physics, jerk-limited ramp, controller soft-start, slippery-surface launch, wheelie risk on a high-CoG deck, and throttle calibration

Acceleration is the longitudinal mirror of braking: the same weight-transfer, but with the sign flipped. Under a hard throttle opening, the motor torque at the rear wheel generates an equal reactive torque on the frame, which pitches the scooter nose-up; the rider's body inertia simultaneously moves rearward. The front wheel unloads — in the limit, it lifts off (wheelie); in the typical case, it loses lateral grip on a corner or a small bump. On an e-scooter, the throttle is not a 'gas pedal' in the traditional sense: between your finger and the stator winding sit a Hall sensor (0.84–4.2 V), a controller with PWM modulation and its own soft-start ramp, the BMS, and finally the motor with MOSFET switches. Each layer adds its own latency (5–50 ms), its own noise floor, and its own limit: an over-driven MOSFET → 150 °C cutoff, a displaced throttle magnet → ghost-throttle in the cold, an overly aggressive ramp in sport mode → a wheelie on a 30 % gradient. Jerk — the second derivative of velocity, m/s³ — has a medical comfort threshold for car passengers of ≈ 0.3–0.9 m/s³ ([ScienceDirect — Standards for passenger comfort in automated vehicles, 2022](https://www.sciencedirect.com/science/article/pii/S0003687022002046)), but on a high-CoG, short-wheelbase e-scooter, even 1.5 m/s³ means a sharp deck pitch and finger-strain on the throttle. CPSC counts 50 000 ED visits in 2022 alone, 94 % of which were solo-falls with no other vehicle involved ([CPSC — E-Scooter and E-Bike Injuries Soar, 2024](https://www.cpsc.gov/Newsroom/News-Releases/2024/E-Scooter-and-E-Bike-Injuries-Soar-2022-Injuries-Increased-Nearly-21)); among typical mechanisms — stuck throttle (Apollo recall 2025) and uncontrolled acceleration on a slippery surface. This is a drill-oriented guide: physics, weight redistribution, jerk-limited ramp, soft-start vs sport mode, slippery launch, wheelie risk, ghost-throttle troubleshooting, a daily launch protocol with a 2–3 mph kick-start, and a 30-min weekly drill in an empty lot. ENG-first sources: MSF Basic RiderCourse, Wikipedia (Jerk physics, Wheelie, Weight transfer, Bicycle-and-motorcycle dynamics), Inside Motorcycles / Data for Motorcycles on the friction circle, Lime / Bird operator manuals, NAVEE on TCS, Apollo, GOTRAX, Levy Electric throttle guides, marsantsx on controller thermals, CPSC injury data.

13 min read

User guide

E-scooter motor and controller engineering: BLDC electromagnetics, FOC, KV constant, MOSFET inverter and IEC/UL/ISO/ECE standards

Engineering deep-dive into the e-scooter powertrain — parallel to the introductory overviews «Motors: geared vs direct-drive hub» and «Controller, BMS, display, IoT»: BLDC electromagnetic physics (Lorentz force F=BIL, Faraday EMF ε=-dΦ/dt, Lenz law), KV constant in RPM/V as winding characteristic, torque constant Kt=60/(2π·KV) — why KV 10 on 48 V gives a theoretical 480 RPM/V × 0,95 = 22 N·m/A through mirror symmetry; stator/rotor topology (12-slot 14-pole inrunner vs hub-mount outrunner, NdFeB N42/N48/N52 remanence Br 1.28–1.44 T, ferrite Y30 Br 0.4 T, samarium-cobalt SmCo for high temperatures); three loss types — copper I²R (`P_cu = 3·I²·R_phase`), iron/hysteresis via Steinmetz (`P_h = k_h · f · B^n`, n≈1.6–2.2), eddy currents (`P_e = k_e · f² · B² · t²`); efficiency 85–92 % and why peak efficiency is always near ~50–75 % rated load; thermal management — IEC 60085 insulation class B (130 °C), F (155 °C), H (180 °C), IEC 60529 IP54/65/67 sealing for hub-mounted motors; FOC (Field-Oriented Control) — Clarke transform abc→αβ, Park transform αβ→dq with rotor angle θ, PI controllers for i_d=0 + i_q as torque command, SVPWM (space-vector PWM) modulation; MOSFET inverter — six-MOSFET three-phase bridge, IRFB3077/IPB019N08N3 with RDS(on) 1–5 mΩ, switching losses `0.5·V·I·(t_r+t_f)·f_sw` at 16–32 kHz, dead time 200–500 ns, gate driver 10–15 A peak; DC-link capacitor — ripple current 10–30 A, low-ESR aluminum-electrolytic 1000–2200 μF or polypropylene film; regenerative braking physics — motor as generator, inverter as rectifier, BMS-limited charge acceptance; engineering ↔ symptom diagnostic matrix; full matrix of 9 standards — IEC 60034-1:2022 rotating electrical machines, IEC 60034-30-1 efficiency classes IE1-IE5, UL 1004-1 motors general, UL 1310 Class 2 power units, ISO 21434:2021 road vehicles cybersecurity, IEC 61508 functional safety SIL 1-4, ECE R10 rev 6 EMC + CISPR 14-1, FMVSS 305 high-voltage powertrain, UN ECE R136 L-category propulsion.

18 min read

User guide

Regenerative braking on electric scooters: physics, settings, limits, and common mistakes

What regenerative braking on an electric scooter actually is, how it works physically (back-EMF, BLDC motor as a generator), why the real range gain is 2–5 %, not the marketing 15–30 %, why regen drops out at full battery and in cold weather, how to tune its strength on popular platforms (Xiaomi M365 / Mi 4 Pro, Segway-Ninebot Max G30, EY3 in Dualtron / Kaabo / Speedway, Apollo Phantom), and what mistakes to avoid. Built on Battery University BU-409/BU-410, Apollo Scooters engineering posts, Levy Electric measurements, Rider Guide P-setting tables, ScooterHacking wiki, and Henry Stanley's M365 manual.

12 min read

Electric scooter components

E-scooter Electronics: Controller, BMS, Display, IoT

How the electronic part of an electric scooter works — everything that is invisible from the outside: motor controller (ESC) — six-step vs sine-wave/FOC, sensored vs sensorless, MOSFET; BMS (Battery Management System) — balancing, protection against thermal runaway, charging at sub-zero temperatures; UL 2271 / UL 2272 and New York's Local Law 39; IoT and telemetry in shared scooters (Lime Gen4, Bird Three, Spin S-200) vs Bluetooth-only in consumer models (Apollo, NAMI, Segway-Ninebot); display as a separate EY3/EY4 module over UART; why scooters still use UART rather than CAN.

13 min read