Top Considerations When Selecting A Harmonic Drive Gearbox
A harmonic drive gearbox is a type of gearbox that uses a harmonic oscillator to transmit power. The harmonic oscillator is a device that converts rotational motion into linear motion or vice versa. This type of gearbox is used in applications where high torque and low speed are required. When looking for a harmonic drive gearbox, here are some things you should consider:
Purpose
Understanding how the gearbox and engine will be utilised is the first step to determining the best assembly for the application. It's critical to fully comprehend how the motor gearbox assembly will be used and its intended function.
Compatibility
It's critical to verify that the motor and gearbox are compatible technologies when selecting the best harmonic drive gearbox and motor combination.
Desired output
Changing the gearbox's configuration impacts the torque and speed of the motor's output. Ensuring that the system can meet the required standards should not be underestimated.
Efficiency
With so many components, it's easy to imagine that maintaining a high-level operational efficiency is difficult. As previously stated, the effective functioning of the whole motor and gearbox configuration relies on numerous elements. However, ensuring that the harmonic drive gearbox is correctly linked to achieving the desired output may improve motor performance.
Power source
If you have a motor and gearbox assembly with an insufficient power source, it can put your engine under strain. This can lead to early deterioration and necessitate maintenance or replacement.
Using multiple gearbox motors
If a single motor isn't enough to meet the need, it's worth considering whether multiple motors would work better.
Service factor
The service factor is the first step for most harmonic drive system makers. This gadget helps to compensate for different things that might affect how it works. Things like different input, how many hours per day it is used, and any shock or vibration present. If there is a shock that is not regular, like if something is grinding, then you will need a higher service factor. And if it is only used sometimes, like a backup power source, you will want a lower service factor.
Class of service
Once you've established this variable, it will define a category of service. A service class 2 is usually given to a machine driven by a plain AC motor that drives an evenly loaded, constant speed conveyor for 20 hours each day.
Overhung load
The harmonic drive system manufacturer's catalogue or website lists the maximum overhung load for given unit size. Suppose the load in an application is greater than the permitted maximum. In that case, the gearbox may need to be up-rated to accommodate the overhanging loading.
Mounting
Mounting options vary depending on the gearbox model, although there are several typical installations. Gearbox makers provide a wide range of alternatives for each unit size. Still, there are many more alternatives to choose from. Mounting feet above or below the body of the gearbox, hollow outputs, and input/output configuration are all possible choices. All gearbox manufacturers offer mounting possibilities and dimensions in catalogues and websites.
Torque output
The harmonic drive gearbox must deliver enough torque to operate the equipment it is connected to. This comprises the requisite torque to start and accelerate machinery, which might be considerably greater than ordinary operational torque and the induced torque created by jams and load shocks.
Speed output
Suppose the application demands a particular speed output. The gearbox must keep that speed while also delivering enough torque to the driven load.
Service factor
The service factor of the gearbox is the percentage of its maximum torque that it can endure for short periods. A large service factor is required if the output will be subjected to regular quick accelerations or occasional load spikes. Because gear reducers do not have a cooling fan, the service factor is also determined by how many hours a day it is used. The larger the production shift, the greater the space required to dissipate produced heat.
Mounting and connection characteristics
If the gearbox mount location has space and profile limitations, the gearbox size, form, and configuration must be considered when selecting a solution. The efficiency of different forms of gearing varies considerably, with planetary gear trains being the most compact while spur gears requiring a larger amount of volume.
Backlash
Backlash is the amount of error or play in the gearmotor's meshing, which results in a gearbox that feels mechanical shock when started or stopped.
Radial load
The force on the output shaft of a gearbox at right angles, such as with a belt pulley or sprocket, is known as a radial load. Different radial load tolerances are required for gearboxes, so double-check that your application's operational conditions will not overload the gearbox.
Harmonic drive gearboxes from companies like UK Harmonic Drives are a specialised type of gearbox that use elliptical gears to provide high torque and speed ratios with very little backlash. They are commonly used in applications where precise motion control is required, such as medical equipment, semiconductor manufacturing, and laboratory automation. Because harmonic drive gearboxes are expensive and require more careful installation than traditional gearboxes. It is important to select the correct model for your specific application before ordering.