3 phase electric motors for variable speed operation

Standard IEC framed motors 120W to 45kW with modular options

These Lenze L-force 3 phase electric motors are designed for variable speed operation with frequency inverters. Operating powers and speeds depend on the output frequency of the inverter and range from 120W to 45kW at 50Hz and 78kW at 87Hz. Standard mountings B3 foot, B5 flange and B14 face are available. A comprehensive range of modular options is available on short lead times and at low surcharges, for example brakes, blowers and encoders. Motors are designed to suit inverter operation and have thermal sensors fitted.

Motor efficiency is IE1 up to 0.55kW, then IE2 in-line with European standard IEC60034-30

Powers	120W to 45kW
Frame sizes	63 to 225
Speeds	motors suit operation up to 87Hz (2500r/min) and close to zero speed if fitted with a blower
Mountings	B3 foot B5 flange B14 force available up to 7.5kW
Construction	Aluminium framed to 7.5kW, then cast iron
Paint	Basalt grey except B14 unpainted
Efficiency	IE1 up to 0.55kW, then IE2
Supply voltage	400V 3 phase/50Hz or 480V 3 phase/60Hz
Protection	Integrated thermal sensors for class F (155^oC)
Ambients	Up to 40^oC and 1000m (derating possible for higher values)
Type codes	Type MDERA up to 0.55kW, type MHERA 0.75 to 45kW
Approvals	UL/CSA CCC and GOST
Feedback options	Resolver, incremental encoder 128 to 2048 pulses, SinCos single or multi-turn absolute encoder
Cooling options	High inertia fan, blowers with 1 or 3 phase supply
Brake options	INTRORQ BFK series spring applied brakes, typically 2 sizes and 4 preset torques per frame. Long life brakes.
Other options	OKS surface protection system for arduous environments. Motec terminal box inverters to 7.5kW. Plug connection for power & feedback. Handwheel


	Also available are matching frequency inverters and gearboxes


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	Links: 108 page catalogue on 3-phase ac motors New regulations on motor efficiency GAMBICA guide to selection of efficient motors Guide to the ErP (energy related products) directive News articles: High efficiency motors with all the extras