Motors and Systematic Gearing Products

Energy efficiency is a core principle at the both ends of utility products; an important factor for manufacturers and users. Our electric motors are designed with high standards regarding the reduction of energy usage, and increased control on the speed and rotational force. When it comes to power deduction, our AC motors are at least fifty percent more economical with energy management.

Furthermore, we can offer you Variable Frequency Drive integration to provide precise control over the AC motor application while using a minimum energy requirement. These parameters have nominated VFD as extremely popular induction motor varieties across numerous industrial sectors.

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General Function of Our Motors

Our all in 1 motors with rectifier technology; it means they have the ability to convert alternating electricity to direct current and again back to alternating current, which defines their VFD application. This offers an increased precision of speed and energy regulation. While having satisfactory application, this mechanism increases the efficiency when compared to traditional control methods, such as hydraulic or mechanical regulation. Our motor benefits include;

  • Increased control control
  • Integrable with artificial intelligent and distance control
  • Acoustically sound
  • Minimized vibration

These explosion proof motors are made to last with minimum maintenance requirements. They offer a robust structure, high ranked IP protection against solid and liquid intrusive elements, lifelong lubricated bearings, coated with a resistant protective layer against weathering. They also provide safety against electrocution by an inbuilt c&d insulation. In case of usability in volatile gas environments, our motors are designed with a protection enclosure for a safe AC/DC transmission to avoid any explosive occurrences- this factor must be further safeguarded with correct installment and appropriate establishment.

Application in Explosive Atmosphere in Zone 1 & Zone 2

According to usage, explosive environments are electric motor hazardous area classification is divided into zone 1 and zone 2, solely based on their operational dangers.

For normal operation or zone 1 usage, chances of explosion are very low to non-existent.

Zone 2 electric motor insulation class, however, are considered as environments, prone to flammable substances in forms of liquid and gas. Sparks or high heat generation are why do we need to be especially careful when working with diethyl ether and similar substances. Our Class II Motors are engineered for such atmospheres. Some examples of zone 2 include; oil and gas rigs, dye and solvent manufacturers, pharmaceutical industry, energy plants and refineries, etc.

They do not generate spark while rotation and temperatures are regulated to prevent explosive dangers. Zone 2 specified motors are further enhanced for explosion safety by insulation of the internal system and electrical board.

For a reliable application, all of our flameproof motors are designed in compliance with national association of speed and explosion such as IEC 60079-0, IEC 60079-1, IEC 60079- 70 and IEC 60079-3 standards. They are also categorized based on temperature classes that cover from -20 to +60 °C.

Each motor is tested and certified for frequency conversion, thermal protection, explosion proof, functionality and polarity regulations before reaching into your hands. English instruction documents including motor description and usage are also sent along each sipping.

Environmental, mechanical and explosion protection are the general categories of safety integration of our motors. Each edition is engineered with a thermistor to shut off the internal circuit, in case of faulty function.

Application of VFD Motors

Application defines our electric motor classificationbased on a few factors, which operate at different frequencies. It means, based on each usage, there has been an adjustment of VFD value in the motor’s design. Here are some utilitarian examples;

  • Pump Motors
  • Pump motors are designed with energy efficiency and controlling speed, whether used as marine pumps, such as centrifugal pumps, vane or high-pressure hydraulic pumps, ballast tank pump open or closed loop scrubber pumps.
    Regulation valves are used to control the flow by using VFD technology, which is also beneficial in handling peak pressure in closed piping systems. For achieving a better running speed, synchronous motors are used together and as a result they run above 50Hz or 60Hz.

  • Air Flow Motors
  • Air Handling Units motors are responsible for ventilation of gas filled chambers ranging from normal air, other gases in means of transport or regulation of temperature. They are widely used in marine air systems, engine cooling pipes of large ships, and industrial heat exchange towers. Our motors boast over fifty percent of decreased energy consumption, followed by safety features to shut down the rotation. Our fans are acoustically silent, which addresses sound pollution as one of the most common issues of ventilation systems.

  • Compressors Pumps
  • Energy saving and precise air flow are among the features of our compressor motors, decreasing the consumption by 10 to 15 percent which alternatively increase the lifetime of the unit. Our refrigerator motors are categorized as screw compressors, with reduced noise and vibration. Our motors are also available in Scotch Yoke compressor variety, enriched with cutting edge VFD operation for long years of reliable usage.

  • Hydraulics Motors for Industry and Marine Use
  • Our motors for Hydraulic Power Units are designed with reduced energy consumption by eliminating excess flow and speed. What makes them stand out among other hydraulic motors is their premium engineering for the deduction of stress of the hydraulic system. By an unruffled on/off function, these high horse power motors cut down on vibration and pressure strains on the entire system. For increasing the pressure capacity, synchronous motor installation and speed enhancement is highly recommended.

  • Motors for Marine tunnel thrusters
  • The flow of water in the ducting system is noticeably improved with VFD- enriched motors, for precise control and speed regulation in addition to decreasing energy related costs. Our motors add up to 40 percent of efficiency to your tunnel thrusters while increasing the overall safety.


  • Marine Deck Machinery Motors
  • VFD engineered motors offer an impeccable control over speed and torque in hoist cranes, capstans, steering gear, windlass and other miscellaneous deck machinery. The control factor is crucial to the overall safety of machinery, personnel and a workplace, especially in offshore oil rigs. Our motors also permit application of multi connectors to a single load. Our marine deck motors surpass the traditional hydraulic system in many beneficial aspects.


Pick the Appropriate Motor for Your Industry

Decentralized Systems or in-built VFD Motors?

The right motor can make all the difference, in usage benefits and energy saving. Picking a VFD motor must be in accordance with electrical insulations, size requirements, and utility demands- based on zone 1 and zone 2 varieties.
If you are seeking an energy saving alternative, IE3 or IE4 motors mark the most popular editions available in the market today.
VFD motors should be used with completely insulated systems, to avoid voltage related explosion; low pass frequency filters are highly recommended for a smooth sine wave voltage passage and reduction of demands for cable shielding- hence reducing the costs.
Variable-frequency drive is inbuilt in the motors or can be used as a can either be integrated with the motors, supplied as a decentralized unit.

  • Integrated solutions are much more simplified with lower space and reduced costs in the long run. Motors with Integrated VFD are available up to 30kW.
  • Decentralized VFD units are installed in the vicinity of a motor wand attached with shielded cable. They call for more secured application and protection standards that comply with IP55 or IP66.
  • The last option is the panel integrated systems, with an enhanced application when compared to decentralized variety.

Factors Affecting the Choice of VFD Varieties

Whether integrated or decentralized VFD, a few factors must be taken into consideration. These factors include; application, electrical network used, and the environment zones of utility. Here is more specified outlook on these elemental factors;

  • Motor variety in accordance with kW/A/RPM/V
  • Voltage, pulse width modulation, and VFD’s carrier frequency
  • Expected temperature drop and rise and ambient sensitivity to these temperatures
  • Environmental use whether marine, industrial or residential
  • Supply network of earthing arrangements
  • Customer-specific UL approvals
  • Application of gearing products such as centrifugal pump, fan, etc
  • Motor operation type with dynamic loads
  • Basic requirement on torque, starting energy and rotation control
  • Standard Protection Class such as inverter duty motor insulation class
  • In-built motors, decentralized, panel- integrated assessment
  • Cable length for decentralized VFD
  • Electromagnetic Compatibility Filter requirements
  • Input or output requirements for safe voltage control
  • Intelligent control compatibility for mid bandwidth communications
  • Special card requirements

What to Look Out for When Purchasing a Motor

The following feature improves the utility experience, increases productivity and helps management of energy efficiency.

  • Electromagnetic Compatibility
  • The first factor to look for is electromagnetic compatibility that can influence radio and data transmitters in an environment. Such interferences are controlled by usage of the shielded cables and voltage filters, which are also considered safety requirements in motor synchronized systems. These influential elements prove more important in residential and marine areas than industrial fields.

  • Noise
  • When choosing a VFD system, noise is another important factor, including acoustic sound pollution and harmonics.

  • Costs
  • Installation costs are the next factor, in contrast with decreased energy consumption, which reduces the overall expenses in the long-term use.

  • Intelligent Control Compatibility
  • Intelligent control over essential parts of a ventilation or hydraulic system stands as a timesaving and important part of systems nowadays. The ability to connect with intelligent control and hands free data collection of temperature, speed flow, energy usage etc remains among the application highlights to keep for. This also assists maintenance, troubleshooting and operation via cloud solution.

RAAH International for Non-Explosive Motors & VFD implementation

Contact our expert assessment in choosing your gear motor system and motor type based on your unique application.
RAAH International is a Singapore-based company with two separate units of safety products and distribution of comprehensive hardware and tool distribution worldwide, including AC Motors. We stand for premium quality, reliability, and convenience which has made us a go-to outlet by countless businesses across the globe.

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