DC motor RS-3650ST series

brushed36 V3 V

Product Overview
RS-3650ST is a 36 mm (540/550-class) brushed DC motor with a 50 mm body length, featuring an ST winding optimized for high torque. The series supports a wide voltage range (3 V–36 V), delivers up to ~37 W output on selected variants and provides stall torque levels up to ~2.3 kg·cm. Typical target uses include automotive actuators, electronic throttle control and high-power consumer appliances.

Key Facts for Engineering Buyers

• Product category: Brushed DC motors
• Motor family: RS-3650ST series (36 mm class)
• Brand / manufacturer: KWC Motor
• Typical applications: automotive seat actuators, electronic throttle control (ETC), vacuum cleaners, RC models, pumps

Specification Signals

• Diameter: 36 mm
• Body length: 50 mm (standard)
• Voltage range: 3 V – 36 V (variant dependent)
• Output power: up to 37.35 W (example model RS-36505ST-6013)
• Stall torque: up to ~2.3 kg·cm (series reference)
• Shaft diameter: 3.175 mm (standard)

Target Applications & Solutions
The RS-3650ST family is engineered for high-load and high-reliability environments where strong low-speed torque and compact form factor are required. Recommended integration areas include:

• Automotive electric actuators — power seat adjustment, electronic throttle control: variants offer high starting torque at low speed and can be specified with automotive-grade EMC options.
• RC models and high-power appliances — racing-grade RC models, high-power vacuum cleaners, air/water pumps: certain variants reach up to 31,500 rpm and deliver up to ~37 W.

Selected Model Performance Table
Model | Operating Voltage (range) | Nominal Voltage | No-load Speed | Speed @ Max. Efficiency | Output Power | Stall Torque
RS-36503ST-7517 | 3.0 V – 7.2 V | 6.0 V | 21,900 rpm | 18,250 rpm | 23.82 W | 1460 g·cm
RS-36503ST-5042 | 6.0 V – 12.0 V | 12.0 V | 18,000 rpm | 15,302 rpm | 30.49 W | 2076 g·cm
RS-36505ST-6013 | 6.0 V – 12.0 V | 12.0 V | 31,500 rpm | 26,420 rpm | 37.35 W | 2363 g·cm
RS-36505ST-2585 | 12.0 V – 36.0 V | 24.0 V | 9,400 rpm | 8,040 rpm | 22.25 W | 1567 g·cm

Customization Notes
Standard shaft diameter 3.175 mm and body length 50 mm. Customization options: D-shaft, dual shaft, pre-soldered leads, capacitors/varistors for EMC suppression, connectors, gearbox integration and alternative windings for low-speed/high-torque or wide-voltage operation. Lead times and pricing depend on confirmed specification, quantity and required options.

Quality, Manufacturing and Supply Features
The series follows 540/550 standard dimensions for interchangeability. Production is performed on automated brushed-motor lines with 100% inspection for noise and current. Materials and processes comply with RoHS / REACH where applicable.

Characteristics / Technical Specifications

• Model family: RS-3650ST
• Diameter class: 36 mm
• Standard body length: 50 mm
• Voltage range: 3 V – 36 V (variant dependent)
• Representative output power: up to ~37.35 W
• No-load speed examples: up to 31,500 rpm
• Stall torque examples: up to ~2363 g·cm (~2.3 kg·cm)
• Shaft diameter: 3.175 mm
• Winding: ST winding for high torque; custom windings available
• Customization: OEM/ODM support for voltage, speed, torque, shaft design, cable/connector, gearbox, EMC suppression