Helical Variable Speed Gear Motors

LOHER Helical Variable Speed Gear Motors are designed for robust performance, low maintenance, and long service life. Featuring hardened and ground gears with steel-on-steel friction discs, they provide quiet operation and reliable performance. The motors offer a graduated 1:10 speed control range, adjustable both at standstill and during operation, making them ideal for a wide range of industrial processes, including applications in corrosive environments.

Key Features & Benefits

Robust and durable construction for long service life
Hardened and ground gears for wear-free operation
IEC standard sizes for easy integration
Quiet operation thanks to steel-on-steel friction discs
Adjustable speed control range 1:10, usable at standstill or during operation
Coatings suitable for corrosive environments
Low maintenance with proven technology
Maximum protection up to IP66

Feature	Specification
Gear Ratio	7.5:1 – 300:1
Speed Range	1:10
Output Speed (rpm)	0.01 – 0.1 to 250 – 2,500
Nominal Torque (Nm)	0.4 – 2,590
Max Torque (Nm)	2,590
Motor Type	3-phase IEC AC motor
Power Range	0.09 – 1.5 kW
Voltage / Frequency	230/400V – 50Hz, 400/690V – 50Hz
Efficiency Class	IE3 (≥0.75 kW – 2 / 4 / 6 poles)
Protection Class	Standard IP55, up to IP66
Insulation Class	F
Material	Cast Iron
Lubrication	ISO VG068 mineral oil
Lifetime (L10h)	> 15,000 hours
Certificates	CE, UL/CSA, ATEX

Optional Features

Remote speed indicator (digital or analogue)
Electrical remote adjustment
Remote adjustment with flexible shaft
PTC thermistor
Bimetal temperature switch
Brake motors
Pole-changing motors
ATEX motors
DC motors
Special voltage/frequency
Increased protection
Reinforced output shaft bearing
Stainless steel output shaft
Forced ventilation

Variations & Mounting Options

IEC Motor Sizes: IEC 56 – 80
Mounting: Foot-mounted, Flange-mounted
Output Shaft Diameter: 12 – 75 mm
Coating / Color: According to ISO 12944, standard RAL7031