Glossary

Humanoid robot glossary

Plain-English definitions of the humanoid-robot and valuation terms used across Valumech — 48 in all, from actuators to depreciation.

Battery management system (BMS): Electronics that keep the pack safe and long-lived - monitoring per-cell voltage, current, and temperature, estimating state of charge/health, balancing cells, and protecting against overcharge and thermal runaway → in the anatomy guide
Battery pack (lithium-ion): The onboard energy store - usually lithium-ion cells - powering actuators, compute, and sensors, increasingly integrated into the torso as a load-bearing member → in the anatomy guide
Charging: The port/dock and charge-control electronics that refill the cells with the BMS. Fast charging shortens downtime but adds heat, so charge rate is bounded by thermal design → in the anatomy guide
Confidence rating: How much trust to place in an estimate. It stays low until real resale transactions accumulate, then rises.
Cycloidal / RV reducer: A reducer where an eccentric drives a lobed disc against pins, transmitting motion through many contact points for high reduction, low backlash, and high shock resistance → in the anatomy guide
Degrees of freedom (DoF): Each independently controllable axis of motion is one DoF; a humanoid spreads dozens across legs, torso, arms, and hands, each driven by its own actuator → in the anatomy guide
Depreciation: The decline in a robot's market value as it ages and wears. Valumech models it as a geometric (compounding) annual rate.
Dexterous multi-fingered hands: Anthropomorphic end-effectors with multiple fingers and many DoF that approximate the human hand, enabling grasping, in-hand reorientation, and tool use rather than simple pick-and-place → in the anatomy guide
Electric motor (BLDC / PMSM): A brushless permanent-magnet motor that turns electric current into rotational torque - the prime mover inside nearly every humanoid joint → in the anatomy guide
Enclosures / ingress protection (IP rating): Sealing of the body and joints, rated by the IEC 60529 IP code (first digit dust, second water) - e.g. IP65 is dust-tight plus water jets, IP67 adds brief immersion → in the anatomy guide
Force / torque sensors: Six-axis sensors measuring the three forces and three torques at a joint - typically at wrists (manipulation) and ankles (ground reaction for balance) - letting the robot feel contact → in the anatomy guide
Form factor: How a humanoid is built to move: Bipedal (legs), Wheeled (a mobile base), or Stationary.
Frameless (housingless) motor: A motor supplied as just rotor and stator - no housing, bearings, or shaft - so it can be embedded directly into a joint to save weight and volume → in the anatomy guide
Grippers (simple end-effectors): Non-anthropomorphic end-effectors - parallel-jaw clamps, suction/vacuum, magnetic - that trade dexterity for reliability on constrained tasks → in the anatomy guide
Hot-swappable batteries: Designs that let a depleted pack be exchanged for a charged one (manually or autonomously) without fully powering down, so the robot resumes work in minutes - a common path toward continuous duty → in the anatomy guide
Imitation & reinforcement learning: How skills are acquired: imitation learning copies human/teleoperated demonstrations; reinforcement learning discovers policies through trial-and-error reward optimization, heavily in simulation → in the anatomy guide
IMU (accelerometer + gyroscope): Measures linear acceleration and angular rate - the robot's inner ear - to estimate body orientation and motion → in the anatomy guide
Joint encoders (absolute / incremental): Position sensors at each joint reporting angle and velocity - the basis of proprioception. Absolute encoders give exact angle without homing; incremental count pulses → in the anatomy guide
LiDAR / time-of-flight: Laser sensors that measure pulse return time to build precise 3D maps, working well in low light or low-texture environments where cameras struggle → in the anatomy guide
Linear actuator (ball / roller screw): Converts motor rotation into linear push/pull via a screw, used where a joint is better driven by a sliding strut (knee, elbow) than a rotary module → in the anatomy guide
Low-level motor control: Deterministic, high-frequency (often kHz) loops that command each joint's torque, velocity, and position from encoder, IMU, and force feedback over a real-time bus → in the anatomy guide
Microphones / audio: Microphone arrays that capture speech and ambient sound for speech recognition, sound localization, and voice interaction; paired with speakers for output → in the anatomy guide
New price (MSRP): The manufacturer's or official sales channel's price for a new unit — sourced or left blank, never guessed.
Onboard compute (edge AI SoC / GPU): A power-efficient processor that runs perception and AI inference locally, so the robot acts with low latency and without depending on a network → in the anatomy guide
Over-the-air (OTA) updates: Secure remote delivery of new firmware, control policies, and AI models to a deployed robot or fleet over a verified channel → in the anatomy guide
Placeholder estimate: A clearly-labeled modeled value shown before data-backed resale comps exist; replaced per robot, and the badge dropped, as confidence rises.
Planetary gearbox: A reducer with a central sun gear, orbiting planet gears, and an outer ring gear that shares load across many teeth - high torque in a compact coaxial package at low-to-moderate ratios → in the anatomy guide
Power electronics / motor drivers: Circuitry that converts DC battery power into the controlled currents each joint motor needs; for brushless motors the driver acts as an inverter, switching DC into the waveforms that control torque and speed → in the anatomy guide
Quasi-direct-drive vs geared (tradeoff): A design choice between QDD actuators (high-torque motor + low gear ratio) that are light, backdrivable, and force-sensitive, versus high-ratio geared actuators that are stiff, precise, and torque-dense but not backdrivable → in the anatomy guide
Quote-only / not publicly priced: Sold by sales enquiry with no published price. Valumech records no MSRP rather than guess one.
Retained value: The share of the original new price a robot still holds at a given age, e.g. ~36% after two years for a consumer-tier model.
RGB / 2D cameras: Standard color cameras; vision is the dominant perception modality for object recognition, scene understanding, and navigation, often feeding end-to-end neural networks → in the anatomy guide
Robots-as-a-Service (RaaS): Renting a robot for a recurring fee instead of buying it outright — common for enterprise humanoids, and not counted as a purchase price.
Runtime / operating time: How long the robot runs on a charge, driven by capacity vs the power that locomotion and tasks draw; dynamic bipedal motion is energy-intensive, so runtimes are often a few hours (commonly cited around 2-4) → in the anatomy guide
Sim-to-real training: Training policies in massively parallel physics simulation (with randomized dynamics and terrain), then transferring them to the physical robot - reducing costly real-world trials → in the anatomy guide
Skin & expressive faces: Non-structural covers and (for social robots) silicone faces with actuated features that protect internals, shape appearance, and convey expression → in the anatomy guide
Stereo / depth cameras (RGB-D): Two or more cameras (often with an IR projector) that compute per-pixel depth, producing a 3D point cloud; RGB-D adds aligned color for object size, shape, and distance → in the anatomy guide
Strain-wave (harmonic) gear: A compact, near-zero-backlash speed reducer using a flexible toothed cup deformed inside a rigid ring to achieve very high reduction ratios. The classic choice for high-torque joints like hips and shoulders → in the anatomy guide
Structure / chassis (materials): The load-bearing skeleton and housings that mount actuators - commonly aluminum alloys (6061, 7075), carbon-fiber-reinforced polymer, engineering plastics, and titanium at high-stress joints → in the anatomy guide
Tactile / touch sensors: Fingertip- and skin-mounted sensors detecting contact, pressure, and texture; vision-based optical tactile sensors image gel deformation across many sensing points → in the anatomy guide
Teleoperation: A human remotely operating the robot - used both to gather high-quality demonstration data and as a fallback when autonomy can't complete a task → in the anatomy guide
Tendon-driven vs motor-in-joint: Two ways to drive finger joints: tendon (cable) drive routes force from motors in the forearm/palm to keep fingers slim and compliant; motor-in-joint designs place actuators at each joint for stiffness and simpler control → in the anatomy guide
Thermal management: Systems that remove heat from actuators, power electronics, compute, and the battery via air or liquid cooling and heat-spreading structures - what allows sustained high power rather than brief peaks → in the anatomy guide
Tier: Valumech's market segment for a robot — hobbyist, consumer, research, or enterprise — which sets the default annual depreciation rate.
Used value (residual value): What a pre-owned robot is worth. On Valumech this is a clearly-labeled modeled estimate, shown as a range until real resale data exists.
Vision-language-action (VLA) models: Multimodal foundation models that take camera images plus a natural-language instruction and output robot actions, letting a humanoid generalize across tasks instead of running hand-coded routines → in the anatomy guide
Weight & its tradeoffs: Total mass and its distribution, set largely by structure and battery choices and balanced against the need for strength and rigidity → in the anatomy guide
Whole-body control & balance: The mid-level controller coordinating all joints to keep the robot balanced (managing its center of mass) while walking, standing, and manipulating on uneven terrain → in the anatomy guide

Components are explained in depth in the anatomy of a humanoid robot; how the valuation terms feed an estimate is in the methodology.