37D metal gearmotor pololu

Here, you will find the complete Pololu 37D motors range. You can make your choice according to :

• the reduction ratio form 1:1 to 131:1
• the addition of a quadrature motor encoder

The motor diameter and the axis dimensions don’t change, which allows you to juggle between models without having to modify the structure of your robot. However, the total length varies slightly depending on the reduction ratio (see below).

Thanks to the following table, you will be able to find which motors corresponds best to your project, according to your needs in rotation speed or torque.

Encoder operation (optional) :

The Pololu Dc motor measures the rotation of a magnetic disc located behind the motor axis. This Hall effect encoder offers a resolution of steps per revolution of the motor axis. To know the resolution per revolution of the output axis, simply multiply the reduction ratio by 64. For example, for a 30:1 ratio, the resolution is 64 x 30 = 1920 steps per revolution of the output axis.

The encoder requires an input voltage between ,5V and 20V and consumes a maximum of 10 mA. Both outputs A and B return a square signal between 0 and the input voltage with a phase shift of approximately 90° (see oscilloscope image below). Each rising and falling edge of the two encoders indicates a step of revolution. The frequency of the edges indicates the rotation speed (1920 steps per turn of the output axis, with a 30:1 ratio) and the order of the transition indicates the direction.

The table below describes the role of the different wires to control the motor and to recover the encoder outputs.

Dimensions :

• motor diameter: 37 mm
• motor length without encoder: from 52 to 57 mm depending on the ratio (see diagram below) - 30.5 mm for the 1:1 ratio
• encoder length (if included): 16 mm
• axis diameter : 6 mm (D-shape)
• shaft length: 16 mm (including a 6 mm metal ring)
• weight: 225 g (110 g for 1:1 ratio)

Specificity of the 1:1 version:

The 1:1 ratio motor still has an encoder, but is supplied without a reduction box. It does not have an output shaft, but a 10-tooth gear, compatible with the reduction blocks of all other versions. As such, this engine is designed more to serve as a replacement than to be used directly.

Note: In order to preserve the motor and ensure optimum longevity, it is recommended not to subject it to a voltage or load exceeding its rated characteristics.

We also invite you to browse the other Pololu motor gearbox ranges:

• Micromotors
• 20D Motors
• 25D Motors