Product category:
Drives, motors and power transmission, couplings, clutches
News Release from: WEG Electric Motors (UK) | Subject: ATEX high efficiency electric motors - ATEX
Edited by the Manufacturingtalk Editorial
Team on 06 November 2006
High efficiency electric motors work in
dusts
Dust ignition proof electric motors for use in ATEX Zones 21 and 22 are designed to operate safely and save energy in environments where explosions can occur due to combustible dust.
WEG has extended its ATEX range of high efficiency electric motors for hazardous applications with the introduction of dust ignition proof (DIP) motors for use in ATEX Zones 21 and 22 The motors are designed to operate safely and save energy in environments where explosions can occur due to combustible dust
This article was originally published on Manufacturingtalk on 18 Dec 2007 at 8.00am (UK)
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The WEG high efficiency DIP ranges are designed in accordance with the requirements of IEC and CENELEC Standards, and with the ATEX Directive 94/9/EC: Categories Ex II 2 D T125oC (Zone 21) and Ex II 3 D T125oC (Zone 22).
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WEG has adopted DuPont NOMEX for phase and slot insulation in the company's W21 line of high efficiency motors.
This means that that one motor will suffice in atmospheres containing both combustible gas and non-conductive combustible dust.
Offering the highest level of safeguarding of the new introductions, the Zone 21 DIP motors are third party certified and offer the highest level of ingress protection on the market: IP66.
These motors are designed to operate in areas where flammable dust can be released, or atmospheres where explosions can occur due to a mixture of air and dust being present.
Complementing the Zone 21 motors for less critical applications, the Zone 22 range is IP55 rated - upgradeable by WEG to IP66, where required.
It is designed for environments, where non-conductive flammable dusts may occur frequently and be present for short periods of time.
Constructed with robust cast iron housings in frame sizes 63 to 355M/L, the new DIP motors are rated for three-phase operation at both 50Hz and 60Hz, in output ranges up to 355kW.
Both ranges are available in 2, 4, 6 and 8 pole configurations, benefit from Class F insulation with Class H winding wire as standard, and are suitable for use with variable speed drives (VSD).
As regards inverter use, the insulation system of all WEG's range of hazardous area motors - gas or dust - is highly efficient in dealing with the higher peak voltages and faster voltage rise times generated by the IGBTs (high dV/dt) used in the latest generation of VSD.
However, as an added safeguard to diminish the risk of excessive surface temperatures, thermal protection of DIP motors is incorporated as standard in the form of PTC thermistors in the motor windings.
In cases of over-temperature, the output from the thermistor initiates a relay, which removes the power supply to the motor, effectively turning it off.
In addition to the high levels of safeguarding they provide, WEG's new DIP range incorporates high efficiency machines that either meet or exceed 1CEMEP / 2WIMES requirements.
Premium Efficiency types meet the requirements of CEMEP's / WIMES EFF1 level, while the Top Premium Efficiency EFF1+ units comfortably exceed these requirements.
In addition, WEG also offers EExd/EEx de high efficiency motors in premium efficiency ratings up to 400kW for use in general hazardous environments.
All of these motor types are registered with the 3DEFRA to enable users to claim enhanced capital allowances (ECAs) on the motor purchase - a substantial contribution to reducing payback times.
* Extensive range of ATEX compliant motors - WEG offers the market the most comprehensive and graduated range of ATEX Compliant electric motors for use in the widest variety of dust laden or gaseous atmospheres.
In addition to the Dust Ignition Proof ranges described above, the following gas compliant classifications are included in the WEG Low Voltage product range: EEx d / EEx de IIA, IIB and IIC (explosion proof), EEx nA, (non sparking) and EEx e (increased safety), which offer the user and OEM the ultimate flexibility in both application specification and cost.
Complementing this flexibility is the wide range available: ratings up to 1120kW and frame size 500 - in standard 2, 4, 6 and 8 pole configurations.
Completing the WEG Hazardous Area offering is a comprehensive range of MV/HV machines in EEx d/EEx de, EEx p and EEx nA variants in multiple polarities and power ratings.
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