Worm Geared Motors
21.05.2025
Worm Geared Motors – Compact Drive Units with Self-Locking Function
Worm geared motors combine a worm gearbox with an electric motor into a compact, integrated drive unit. They are especially valued in industrial applications that require right-angle torque transmission, high gear reduction, and often self-locking capability. These motors are ideal for use in tight installation spaces and wherever reverse motion needs to be prevented. In this article, you’ll learn everything about the design, functionality, advantages, and applications of worm geared motors – and why Rehfuss Drive Solutions is your expert for reliable drive systems.
What Is a Worm Geared Motor?
A worm geared motor is a fully assembled unit consisting of:
A worm gearbox with a right-angle drive
An electric motor (e.g. asynchronous, synchronous, or servo motor)
A hollow or solid output shaft for power transmission
The gearbox reduces the motor’s speed while increasing the torque. Due to the special worm gear design, the system often exhibits self-locking behavior, which prevents backdriving of the output shaft in certain conditions.
How Do Worm Geared Motors Work?
The motor drives the worm shaft, which is positioned at a 90-degree angle to the worm wheel. When the worm rotates, it turns the wheel through sliding contact. This results in:
High torque multiplication
Smooth, quiet operation
Optional self-locking effect, depending on the gear ratio and load
These geared motors are especially suitable for machines that require slow movement, high force, or secure holding in place without additional brakes.
Advantages of Worm Geared Motors
1. Space-Saving Design
Right-angle configuration allows compact installation, especially in space-constrained machines.
2. High Gear Ratios in a Single Stage
Gear ratios from 5:1 up to 100:1 or more are possible in just one gearbox stage.
3. Self-Locking Effect
Prevents back-driving in many configurations – ideal for lifting, tilting, or holding loads without extra brakes.
4. Smooth and Quiet Operation
Low noise levels due to sliding gear contact – perfect for indoor or noise-sensitive environments.
5. Easy Maintenance
Often delivered with lifetime lubrication and sealed gear housings.
6. Versatile Mounting Options
Available in foot, flange, and torque arm versions for flexible integration.
Typical Applications of Worm Geared Motors
Conveyor belts and transport systems
Packaging machinery
Lifting tables and gates
Mixers and agitators
Garage doors and roller shutters
Turntables, indexing drives
Automated doors and window systems
Their self-locking feature makes them especially useful for vertical motion and holding loads safely without an external brake.
Comparison: Worm Geared Motors vs Other Gearmotor Types
Worm geared motors:
Right-angle drive
High gear reduction
Self-locking possible
Moderate efficiency
Quiet and compact
Parallel shaft configuration
Higher efficiency (up to 98%)
No self-locking
Slightly larger footprint for same torque
Bevel geared motors:
Right-angle drive
High torque capability
More complex and costly
No self-locking
Materials and Protection Levels
Rehfuss worm geared motors are built with high-quality materials:
Housings: Aluminum (lightweight) or cast iron (heavy-duty)
Gears: Hardened steel worm, bronze or special alloy worm wheel
Protection: IP54 to IP66 available for dust- and moisture-prone environments
Lubrication: Grease-filled or oil-bath; often maintenance-free
Optional configurations include food-grade lubricants, stainless steel versions, and custom coatings for aggressive environments.
Worm Geared Motors by Rehfuss Drive Solutions
Rehfuss offers a wide range of worm geared motors designed for industrial use. Our solutions feature:
Modular designs with IEC or custom motors
Hollow or solid shafts, with or without shrink disc
Compact, maintenance-free gear units
Accessories like brakes, encoders, and temperature sensors
Certified options for CE, UL, CSA, ATEX
Buy Worm Geared Motors Now
Need a compact and secure drive system with high reduction and holding capacity? Rehfuss worm geared motors provide reliable performance and durability for demanding environments.