Compact and robust PMDC, brushless and application-specific transaxle solutions configured around vehicle load, speed, ratio, braking and chassis integration.
12–72 VBattery platforms
150 W–11 kWOutput capability
Custom ratiosApplication-matched gearing
Rugged & reliableDemanding environments
Engineered for real-world performanceMotion | Control | Integration
STX Transaxle Drive Systems
SDT offers several series of power-differentiating transaxles—STX-B1, STX-B2, STX-B3, STX-B4 and customised series. Engineered for high reliability and performance, our transaxles are designed for medical mobility and utility vehicle applications.
STX-B1
Brushed DCTransaxle
STX-B2
Brushed DCTransaxle
STX-B3
Brushed DCTransaxle
STX-B4
Brushed DCTransaxle
STX-E1
Brushless DCTransaxle
STX-E2
Brushless / PMSMTransaxle
STX-E3
High-Power ElectricTransaxle
STX-900
Application-specificTransaxle Solution
2.
Technical Data
Power Range: 150–11,000 W
Speed Range: 50–500 rpm
Series
Voltage (V)
Motor Technology
Power Range (W)
Speed Range (rpm)
STX-B1
12–24
PMDC
150–500
95–120
STX-B2
24–36
PMDC
750–1,000
95–275
STX-B3
36–48
PMDC
800–1,300
95–125
STX-B4
24–48
PMDC
1,500–2,000
100–275
STX-E1
24–48
BLDC
500–800
150–200
STX-E2
48–72
BLDC / PMSM
3,000–5,000
100–500
STX-E3
48–72 DC/AC
BLDC / AC
6,000–11,000
150–275
STX-900
Application specific
Application specific
Bespoke
Bespoke
STX transaxle technical dataReview the representative voltage, motor technology, output power, axle speed and configuration information.
Single-piece cast housing for improved gear alignment, rigidity and durability
Optimised gear profile for efficient, low-noise operation
Various reduction ratios and output-speed ranges
Fully enclosed axle suitable for demanding indoor and outdoor applications
Configurable mounting and track widths, including custom dimensions
Multiple motor options: PMDC, BLDC and AC
Electromagnetic power-off brake, brake cover and connector options
Hub-type and custom axle configurations
Application-specific motor, ratio, brake and mounting configurations available
Application-led transaxle selection
Define the Vehicle Duty Before Selecting the Drive
Use these six inputs to connect vehicle performance, motor technology, ratio and mechanical integration. Hover, focus or tap each item for the engineering implication.
01
Vehicle load
Gross vehicle mass, payload distribution and required wheel load establish the continuous and peak tractive demand.
Why it matters +
Customer value
Vehicle mass alone is insufficient; rolling resistance, acceleration, gradients, surface condition and load distribution determine the required wheel torque.
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02
Speed & wheel
Travel speed, wheel diameter and permitted motor speed establish the effective reduction ratio.
Why it matters +
Customer value
Wheel size and target speed connect motor operating speed to axle output. The ratio must also preserve launch torque, efficiency and thermal margin.
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03
Duty cycle
Operating time, starts, reversals, gradients and braking events define the thermal and mechanical duty.
Why it matters +
Customer value
Repeated acceleration, hill holding and reversing can dominate temperature rise and gear loading even where average vehicle power appears modest.
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04
Power system
Battery voltage, current capability, motor technology and controller architecture are selected together.
Why it matters +
Customer value
PMDC, BLDC or AC technology is matched with the available supply, controller, protection, regeneration strategy and required speed-control behaviour.
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05
Vehicle interface
Track width, mounting, hubs, axle geometry, brake and service access must suit the chassis.
Why it matters +
Customer value
A technically suitable drive must also install and service correctly. Shaft, hubs, bearings, mounting datums and brake arrangement are controlled around the actual vehicle.
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06
Environment & life
Ingress, contamination, shock, vibration, temperature and target life influence the complete construction.
Why it matters +
Customer value
Housing, sealing, lubrication, corrosion protection, bearings and validation evidence are defined against the real operating environment and service expectation.
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3.
Industries & Applications
STX transaxles are designed for a wide range of mobility, utility and industrial applications, delivering efficiency, reliability and performance in demanding environments.
Cleaning & Floor-Care Equipment
Ride-on scrubbers and professional cleaning machines for commercial and industrial facilities.
Medical Mobility
Mobility scooters and personal transport solutions for healthcare and independent living.
Material Handling
Forklifts, pallet trucks and material-handling vehicles for warehousing and industrial operations.
Mobile Robots & AGVs
Automated guided vehicles and mobile robots for intelligent material movement.
Outdoor Power Equipment
Powered equipment and utility carts for outdoor, landscaping and grounds maintenance.
Utility & Light Vehicles
Utility, maintenance and low-speed vehicles for industrial and commercial use.
EAEngineered for Your Application
SDT works with you to configure or develop transaxle solutions around your vehicle requirements, including load, speed, ratio, track width, braking, mounting interfaces and environmental conditions.
Define the appropriate STX solution
Discuss Your Transaxle Requirement
Share the vehicle load, wheel size, speed, gradient, input power source, operating environment and duty cycle.