Description
The Woodward SMM40 (Part Number 1766-523) is a precision speed-adjusting actuator motor manufactured by Sawamura Denki Kogyo for Woodward Governor (Japan) Ltd. It provides low-power, controlled mechanical actuation to adjust the speed reference setpoints on mechanical and electronic governor systems (such as the Woodward UG10D series) in marine propulsion and power-generation plants.
Commercial Inventory & Procurement Details
| Logistics Parameter | Value / Terms |
| Hardware Condition | New Original (Factory Sealed Surplus) |
| Warranty Period | 12-month comprehensive warranty |
| Availability | In stock (subject to prior sale) |
| Standard Lead Time | Ships within 1 to 2 business days from order confirmation |
| Commercial Pricing | Price subject to market conditions; contact us for a firm quote |
Technical Specifications
The following electrical and mechanical constraints define the operating envelope of the 1766-523 motor assembly. Review your plant’s specific mechanical governor manual before installing this component.
| Parameter | Value |
| Manufacturer | Sawamura Denki Kogyo / Woodward Governor (Japan) Ltd |
| Model Designation | SMM40 |
| Part Number (P/N) | 1766-523 |
| Input Voltage | 24 V DC |
| Current Consumption | 0.15 A |
| Safe Continuous Torque | 0.2 N·m |
| Speed Index / Rating | Speed setting 2 (low-speed synchronization profile) |
| Ingress Protection Rating | IP44 rated casing enclosure |
| Drive Configuration | Reversible DC motor design |
| Typical Integration Mount | Integrated internal governor housing or local console assembly |
Engineering Context & Deployment Considerations
Marine and Power Synchronization Applications
The SMM40 motor is an essential component within marine diesel propulsion loops and auxiliary generator power management frameworks. It links remote electrical synchronization controls—such as the main engine control room (ECR) lever or automated power management systems (PMS)—to the physical governor’s speed-droop adjustment mechanism. By operating the 24 V DC motor in forward or reverse directions, operators shift the speed reference setting, enabling precision active-load sharing across parallel-running generator blocks.
Environmental & Physical Integration
- Enclosure Protection: The module carries an IP44 ingress rating, protecting it against solid objects larger than 1.0 mm and splashing water from any direction. This makes it suitable for standard engine-mounted governor spaces, but it must be kept free of direct fluid pooling or pressurized washdown sprays.
- Friction and Latching: The 0.2 N·m safe torque rating is calculated to overcome the internal spring resistance of the governor’s speed-setting assembly. Excessive mechanical binding in the governor linkages can cause the motor to draw higher current than its 0.15 A specification, resulting in internal thermal degradation or blown circuit fuses within the control panel.
- Reversing Polarity: Ensure that your remote panel uses clean, snubber-protected relay contacts to switch DC polarity across the motor leads. Unprotected contacts can cause inductive voltage spikes that degrade the motor windings over long periods.
Frequently Asked Questions
Can this motor be used on European-manufactured Woodward UG-8 or UG-10 governors?
Yes, the 1766-523 motor is a direct form-fit-and-function replacement for the speed-adjusting assemblies found across a wide range of UG series hydraulic-mechanical governors, including the UG10D platform. Always verify that your original governor nameplate specifies a 24 V DC motor with a comparable current rating before replacement.
What indicates a failure of the internal SMM40 motor assembly during sea trials?
The most common field symptoms are a lack of remote speed response (the engine or generator rpm fails to shift when raising/lowering setpoints from the bridge or ECR) or sluggish, intermittent stepping behavior. Disconnect the dual supply wires at the governor junction box and measure the winding resistance. An open circuit or zero-ohm short indicates a damaged armature requiring a complete module swapout.
Does this motor include internal mechanical limit switches?
No. The SMM40 is a continuous-rotation DC motor mechanism. Limit-stopping protection is handled by the mechanical friction clutches or auxiliary micro-switches integrated directly into the governor housing. When configuring your control systems, clamp the drive pulse intervals to prevent driving the motor against solid mechanical stops for extended durations.
