Can you back drive a harmonic drive?

Can you back drive a harmonic drive?

Back Driving – Harmonic Drive® gears are reversible and can be back driven. If necessary, loads can be held in place by braking the Wave Generator when the servo system is not powered.

What is the purpose of a harmonic drive?

Harmonic Drive, also called Harmonic Drive gear, harmonic gear, or strain wave gearing, mechanical speed-changing device, invented in the 1950s, that reduces the gear ratio of a rotary machine to increase torque.

What are the advantages of harmonic drive over gear drives?

Compared to classical toothed gears, harmonic drives have numerous advantages, but there are some disadvantages as well. Their main advantages include: high torque capacity, excellent positioning accuracy and repeatability, compact design, zero backlash, high single-stage reduction ratios and high torsion stiffness.

Are harmonic gearboxes Backdrivable?

Backdrivability of a harmonic drive, when used as torque increaser, means that the output shaft can be rotated via finite amount of torque. A high ratio harmonic drive is non-backdrivable because its output shaft cannot be turned by applying a torque on it.

Who invented harmonic drive?

inventor Clarence Walton Musser
The unique principle of the HarmonicDrive® was based on a brand new concept. The mechanism was the brainchild of the American inventor Clarence Walton Musser.

How do you calculate the gear ratio on a harmonic drive?

r = n E n C − n E , where: r is the gear reduction ratio. nC is the number of teeth on the circular ring gear.

What are the main components of a harmonic drive gear?

shown in Figure 1, a harmonic drive system is composed of three key components: a wave generator, a flexspline with outer teeth and a circular spline with inner teeth.

Who invented Harmonic Drive?

How do you calculate the gear ratio on a Harmonic Drive?

What does back drivable mean?

Adjective. backdrivable (comparative more backdrivable, superlative most backdrivable) (of a system of gears) able to operate in the reverse direction.

When was harmonic drive invented?

This invention was awarded 61 patents, and Musser personally oversaw its manufacture and prototype testing….Life of C. W. Musser.

1909 Born in Lancaster, Pennsylvania
1968 Won a mechanical design award from the American Society of Mechanical Engineers (ASME)

What is backlash in gear?

Backlash refers to the angle that the output shaft of a gearhead can rotate without the input shaft moving. Backlash arises due to tolerance in manufacturing; the gear teeth need some play to avoid jamming when they mesh.

What is back drive motor?

Back-drive-ability is defined as the degree of ease of which a motor or gear motor can be driven by its attached load when power is removed from the motor. Typically, a motor is fairly easy to back-drive by turning the output shaft by hand.

What is back drive torque?

Back drive is the result of the load (thrust force) pushing axially on the nut to create rotary motion. The resulting torque is known as “back-driving torque” and is the torque required to hold a load in position.

How do you reduce backlash?

The simplest and most common way to reduce backlash in a pair of gears is to shorten the distance between their centers. This moves the gears into a tighter mesh with low or even zero clearance between teeth. It eliminates the effect of variations in center distance, tooth dimensions, and bearing eccentricities.

What is back drive force?

Backdrive is when the load of a screw, actuator, or system is able to operate the unit in reverse when unpowered. In most cases with Thomson products, this means that the force of gravity drives the nut down a screw, retracts an actuator, or moves a slide when power is not being applied.

What is back and drive?

What are the advantages of a leadscrew gear?

Large mechanical advantage. Precise and accurate linear motion. Smooth, quiet, and low maintenance. Minimal number of parts.