Dedicated to decarbonizing shipping, enhancing energy efficiency, and promoting the application of clean energy, we actively respond to the national strategic goals of "peaking carbon emissions and achieving carbon neutrality."
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RUIYI(SHANGHAI) was established in 2008 and is located in the Waigaoqiao Free Trade Zone in Pudong New Area. The company has long been engaged in the R&D, production, and sales of intelligent control systems for marine equipment, ship power propulsion systems, and integrated solutions for clean energy. We are committed to decarbonizing shipping and improving energy efficiency in maritime transportation, as well as promoting the application of clean energy. We actively support the national strategic goals of "peaking carbon emissions and achieving carbon neutrality."
Currently, the company has obtained ISO 9000 quality system certification, BV factory certification, and high-tech enterprise certification from the Shanghai Municipal Science and Technology Commission. It also holds multiple patents, including five utility model patents and over 40 software copyrights and intellectual property rights. Our products have passed the product inspections and received certificates from nine major classification societies, including the China Classification Society (CCS), Norway’s DNV, and the UK’s Lloyd’s Register (LRs).
The company was established.
20 years of industry experience
The R&D technology team consists of over 20 members, accounting for more than 40% of the workforce
Patents and core intellectual property
Equipped on over 5,000 vessels worldwide
Core Technology
Brand-new space vector technology
The advanced vector algorithm ensures high torque at low frequencies, maximizes grid voltage utilization, and delivers optimized sinusoidal output—all while achieving the lowest possible switching losses. As a result, it reduces motor operating noise and minimizes heat generation.
Unique software dead-zone compensation
Dead-time is the primary culprit behind low-frequency pulsating torque generated by variable frequency drives. Our unique software-based dead-time compensation ensures maximum smoothness of torque even under low-frequency, high-speed operating conditions.
Excellent speed-tracking self-starting without a speed sensor
Our product can start motors that are already running, ensuring smooth and continuous operation of user equipment. It automatically recognizes the rotational speed and achieves stable speed tracking.
Automatic energy-saving operation
Unique software-based power factor regulation dynamically adjusts the power factor according to load changes, saving even more energy.
Voltage fluctuation suppression
The dynamic automatic voltage control (AVC) function ensures that when the input voltage fluctuates by ±20%, the output voltage fluctuation remains below ±5%.
Friendly human-machine interface, flexible input/output interfaces
The CD supports both Chinese and English display, and provides 8 digital inputs, 2 analog inputs, 3 digital outputs, and 2 analog outputs. The eight segments can be programmed by the user and feature an electric potentiometer setting mode.
Powered by DC power supply, saving on investment in backup power systems.
Built-in flexible PWM energy-regenerative braking—users can easily implement energy-regenerative braking by selecting the appropriate braking resistor.
Intelligent Lubrication for Industrial and Mining Equipment
It features protection functions including overvoltage, overcurrent, undervoltage, IGBT short-circuit, and inverse-time overload protection. Additionally, it can provide safe protection even in the event of a load short circuit or ground fault.
Solution & Product
Ocean and Ships
We specializes in the R&D and manufacturing of ship electric propulsion systems, main-side thruster propulsion systems, and intelligent control solutions. Its product portfolio includes propulsion motors, generators, and drives for various marine equipment, and its products are certified by nine major classification societies. The company is committed to promoting the smartization and decarbonization of shipping.
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Renewable energy
We are actively engaged in the integrated application of clean energy sources such as solar, wind, and ocean energy. We have already completed several pilot projects, offering services including solar panel installation on ships, power quality management, and energy storage systems, thereby supporting the practical implementation of clean energy in the shipping and industrial sectors.
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Energy-saving renovation
Our core business is variable-frequency energy-saving control systems, which are applied to main engine cooling pumps, cargo oil pumps, and other equipment. By employing intelligent PID control, these systems can achieve energy savings of 50% to 80%, significantly reducing energy consumption and emissions. They are highly operable and easy to maintain.
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Petroleum and Petrochemical Natural Gas
We provides specialized variable-frequency control solutions for industries such as oil and gas, including variable-frequency systems for cargo oil pumps. By leveraging efficient power control, these solutions meet industry-specific requirements and help customers achieve energy savings, reduced consumption, and safe operations.
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Ocean and Ships
Renewable energy
Energy-saving renovation
Petroleum and Petrochemical Natural Gas
NEWS CENTER
2025/10/29
The concept of electric propulsion is showing a continuously growing trend in the market.
The bow and stern thruster system for the 40,000-ton self-discharging vessel built by CSSC Chengxi was designed by Ruiyi and the related equipment was packaged and produced by Ruiyi. During the design process, Ruiyi maintained thorough communication with the shipowner, the design institute, the shipyard, and the classification society, actively incorporating their optimization suggestions. Ruiyi tailored a bespoke bow and stern thruster system specifically for this vessel. During the sea trials, the entire bow and stern thruster system operated smoothly, and all performance indicators met both the design specifications and the actual operational requirements of the vessel. Chengxi Shipyard highly praised Ruiyi’s equipment performance and integrated packaging capabilities for the bow and stern thruster system.
2025/10/29
The bow and stern thruster system for the 40,000-ton self-discharging vessel built by CSSC Chengxi was designed by Ruiyi and the related equipment was packaged and produced by Ruiyi. During the design process, Ruiyi maintained thorough communication with the shipowner, the design institute, the shipyard, and the classification society, actively incorporating their optimization suggestions. Ruiyi tailored a bespoke bow and stern thruster system specifically for this vessel. During the sea trials, the entire bow and stern thruster system operated smoothly, and all performance indicators met both the design specifications and the actual operational requirements of the vessel. Chengxi Shipyard highly praised Ruiyi’s equipment performance and integrated packaging capabilities for the bow and stern thruster system.
2025/10/29
On January 4—the first working day of the new year—the groundbreaking ceremony for Phase II of the Changxing Shipbuilding Base, a major project listed by the National Development and Reform Commission, was held on Changxing Island in Shanghai. This project is another landmark initiative aimed at implementing the spirit of the strategic cooperation agreement between China Shipbuilding Group and the Shanghai Municipal Government, promoting the optimization and restructuring of shipbuilding enterprises based in Shanghai, and facilitating their transformation and development. It also underscores the thorough implementation of national strategies such as building a strong maritime nation, a strong science and technology nation, military-civilian integration, and Made in China 2025, thereby driving high-quality development of China’s shipbuilding and offshore engineering industry. Moreover, this marks the full-scale launch of the relocation project for Hudong-Zhonghua Shipbuilding (Group) Co., Ltd., a subsidiary of China Shipbuilding Group, to its new site—the Hudong-Zhonghua New Factory Area.
2025/12/18
The concept of electric propulsion is showing a continuously growing trend in the market.
To date, Ruiyi Mechanical & Electrical has provided related products for more than 2,000 vessels at shipyards across China. We not only offer turnkey integrated power and drive control systems that are fully equipped with all necessary functions, but also supply high-performance electrical equipment and complementary components separately. By delivering long-term value to our customers and continuously expanding the applicability of our products, we have maintained steady growth over the years and steadily strengthened our position in the market. Our core business areas include: motor & generator systems, variable-frequency drives, main propulsion systems, cargo pumps, engine room ventilation fans, seawater pump frequency converters, and other system integrations.
Address: 1-2 Floors Of Building 6, 668 Heng'an Road, , Pudong, Shanghai
Phone:(86)-021-31347980
Fax: (86)-021-31347985
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