{"openapi":"3.1.0","info":{"title":"Elevator Traction API","version":"1.0.0","description":"Traction-elevator engineering maths as an API, computed locally and deterministically — the counterweight, hoist-motor and rope-traction numbers a lift engineer or building-services designer sizes a passenger elevator with. The counterweight endpoint gives the balancing mass = the empty car plus a fraction of the rated load (the overbalance, typically 40–50 %, 45 % common), so a 1,000 kg car rated for 1,000 kg uses a 1,450 kg counterweight — the car and weight balance near half load and the machine is sized for the worst-case imbalance, not the full load. The motor-power endpoint uses that: because the counterweight cancels most of the car, the motor only lifts the out-of-balance load = rated load × (1 − overbalance), so power = that × g × speed ÷ efficiency (~65–75 % geared) — a 1,000 kg lift at 1.5 m/s needs only about 11–12 kW, half what a counterweight-less hoist would draw. The traction-ratio endpoint checks the friction grip: a traction elevator moves the ropes by friction over the sheave, so the available traction (e^(μθ), the capstan equation) must beat the T1/T2 tension ratio at both worst cases — a full car at the bottom and an empty car at the top — and it returns the governing ratio. Everything is computed locally and deterministically, so it is instant and private. Ideal for lift-design and building-services tools, vertical-transport and MEP utilities, and engineering calculators. Pure local computation — no key, no third-party service, instant. Sizing estimates — follow the lift code and maker data. 3 compute endpoints. For block-and-tackle use a pulley API; for capstan friction a capstan API.","contact":{"name":"PremiumApi","url":"https://www.oanor.com/by/premiumapi"}},"servers":[{"url":"https://api.oanor.com/elevator-api","description":"oanor gateway"}],"tags":[{"name":"Elevator"},{"name":"Meta"}],"components":{"securitySchemes":{"oanorKey":{"type":"apiKey","in":"header","name":"x-oanor-key","description":"Get your key at https://www.oanor.com/developer/keys"}}},"security":[{"oanorKey":[]}],"paths":{"/v1/counterweight":{"get":{"operationId":"get_v1_counterweight","tags":["Elevator"],"summary":"Counterweight from car and load","description":"","parameters":[{"name":"car_weight_kg","in":"query","required":true,"description":"Empty car weight (kg)","schema":{"type":"string"},"example":"1000"},{"name":"rated_load_kg","in":"query","required":true,"description":"Rated load (kg)","schema":{"type":"string"},"example":"1000"},{"name":"balance_pct","in":"query","required":false,"description":"Overbalance % (default 45)","schema":{"type":"string"},"example":"45"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/motor-power":{"get":{"operationId":"get_v1_motor_power","tags":["Elevator"],"summary":"Hoist-motor power at full load","description":"","parameters":[{"name":"rated_load_kg","in":"query","required":true,"description":"Rated load (kg)","schema":{"type":"string"},"example":"1000"},{"name":"speed_mps","in":"query","required":true,"description":"Car speed (m/s)","schema":{"type":"string"},"example":"1.5"},{"name":"balance_pct","in":"query","required":false,"description":"Overbalance % (default 45)","schema":{"type":"string"},"example":"45"},{"name":"efficiency_pct","in":"query","required":false,"description":"Drive efficiency % (default 70)","schema":{"type":"string"},"example":"70"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/traction-ratio":{"get":{"operationId":"get_v1_traction_ratio","tags":["Elevator"],"summary":"Rope-traction T1/T2 ratio","description":"","parameters":[{"name":"car_weight_kg","in":"query","required":true,"description":"Empty car weight (kg)","schema":{"type":"string"},"example":"1000"},{"name":"counterweight_kg","in":"query","required":true,"description":"Counterweight (kg)","schema":{"type":"string"},"example":"1450"},{"name":"rated_load_kg","in":"query","required":true,"description":"Rated load (kg)","schema":{"type":"string"},"example":"1000"}],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}},"/v1/meta":{"get":{"operationId":"get_v1_meta","tags":["Meta"],"summary":"Spec","description":"","parameters":[],"security":[{"oanorKey":[]}],"responses":{"200":{"description":"OK"},"401":{"description":"Missing or invalid x-oanor-key header"},"402":{"description":"Active subscription required"},"429":{"description":"Rate-limit or monthly quota reached"},"502":{"description":"Upstream did not respond"}}}}},"x-oanor-pricing":[{"slug":"free","name":"Free","price_cents_month":0,"monthly_call_quota":4650,"rps_limit":2,"hard_limit":true},{"slug":"starter","name":"Starter","price_cents_month":1310,"monthly_call_quota":48500,"rps_limit":6,"hard_limit":true},{"slug":"pro","name":"Pro","price_cents_month":4120,"monthly_call_quota":207000,"rps_limit":15,"hard_limit":true},{"slug":"mega","name":"Mega","price_cents_month":12650,"monthly_call_quota":1105000,"rps_limit":40,"hard_limit":true}],"x-oanor-marketplace-url":"https://www.oanor.com/api/elevator-api"}