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What is a planetary motor?

Planetary motor is a type of motor that has a planetary gear system integrated to it. This offers several advantages like repeatability, precision, lower noise, better durability, etc.

How do planetary motors work?

A planetary gear motor mimics a planetary rotation system; the input shaft drives the central gear, also known as the sun gear, which then turns the surrounding gears, also known as planet gears
 

What is the advantage of a planetary motor?

Increased Precision: Rotating angular stability improves the accuracy and reliability of the movement

Increased repeatability: Its greater speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear.

Lower noise level because there is more surface contact: Rolling is much softer and jumps are virtually nonexistent.

Greater durability: Due to its torsional rigidity and better rolling. Thus, greater efficiency of the gear and a much smoother operation is achieved.

Efficiency: Planetary reducers offer greater efficiency and thanks to its design and internal layout losses are minimized during their work.

Increased torque transmission: With more teeth in contact, the mechanism is able to transmit and withstand more torque. 

Maximum versatility: Its mechanism is contained in a cylindrical gearbox, which can be installed in almost any space.
 

Why are planetary gears used in automatic transmissions?

Automatic transmission usually has one or more planetary gear sets. Since all the gears involved are always meshed with each other, this gear set has an advantage of being able to change the gear ratio without having to engage or disengage individual gears. This allows for smooth gear changing even under load and without a clutch.

How do planetary gears differ from other gears?

Due to the construction and arrangement of the gears, planetary gear can contain multiple gear ratios in a relatively compact space. This offers a multitude of benefits as mentioned above and it is very common to find this gear arrangement in higher end products.
 

How do planetary gears increase torque?

In planetary gear systems, if the rotational speed of the input shaft is higher than the output shaft, the resulting torque would be increased. This can be achieved by putting the ring gear in stationary and sun gear in rotation, causing torque to increase at the output shaft
 

How much do planetary motors cost?

Planetary gears are relatively more expensive compared to DC motors and geared DC motors due to their complex gear arrangements. Depending on the size, torque range and quality, the prices can vary from anywhere between hundred to thousand rupees.