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Motor Encoder Unit (BMB/BMO Series)

モーターエンコーダ・ユニット / SKF (Official website)

Motor encoder unit integrated with a bearing. Multiple sizes with bore diameters of 15 to 45 mm are available, and model numbers differ by pulse count and output cable length.

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Specifications

Inner diameter (hole diameter) 15~45 mm
Outer diameter 35~85 mm
Resolution (pulse count) 32~80 –
Periodic accuracy ±3~±5 %
Phase Difference 90±20~90±30 °
Maximum Rotational Speed 5600~14000 r/min
Mass 0.07~0.53 kg

How to choose Rotary encoders

Points to check when selecting, with the values for this product (Motor Encoder Unit (BMB/BMO Series)).

  1. 1. Select pulse count based on required angular resolution

    This product: Resolution (pulse count) 32~80 –

    The number of pulses per revolution determines the smallest detectable angle. Listed products have a relatively low count of 32 to 80 pulses/rev, suited to motor speed control and steering detection. Counting both edges of A and B phases (4x multiplication) quadruples the effective resolution, so confirm the required value together with the processing method of the controller.

  2. 2. Allow margin in maximum rotational speed

    This product: Maximum Rotational Speed 5600~14000 r/min

    The maximum rotational speed of listed products ranges widely from 300 to 14000 r/min. Confirm that the application's top speed has sufficient margin. Also confirm that the output frequency, determined by rotational speed multiplied by pulse count, falls within the input frequency capability of the receiving-side counter.

  3. 3. Select a bearing unit with bore matching the shaft diameter

    This product: Inner diameter (hole diameter) 15~45 mm

    For bearing-integrated types, the bore must match the diameter of the mounting shaft. Listed products have bores of 15 to 45 mm, with sizes divided by shaft diameter. Check the fit tolerance and axial positioning method against the drawings, assuming use as a bearing.

  4. 4. Check mounting space by outer diameter and mass

    This product: Outer diameter 35~85 mm

    Outer diameters range from 35 to 85 mm, and masses from 0.07 to 0.53 kg. Check interference with the motor housing or pulley interior, including the cable exit direction. When mounting on a rotating body, consider the effect of mass on inertia and vibration.

  5. 5. Match supply voltage to the control circuit

    Listed products operate on a supply voltage of 5 to 12 V DC. Confirm that it matches the available power supply, and that the output signal voltage level and output circuit type meet the input specifications of the receiving side. For automotive applications, also confirm tolerance to supply voltage fluctuations.

  6. 6. Verify phase difference, duty ratio, and cycle accuracy

    This product: Periodic accuracy ±3~±5 %

    Large variations in the phase difference between A and B phases (normally 90°), duty ratio, or cycle accuracy can cause direction determination errors and speed detection fluctuations. For high-precision speed control, check in the specifications that these tolerances meet the control requirements.

This guide was written by AI based on the listed products' documents and specification items.

About Rotary encoders and all products

Description

Unit incorporating a sensor into a deep groove ball bearing with bore diameters of 15 to 45 mm. Pulse count is 32 to 80, and there are specification variants with cable included (008A, 108A).

Features

  • Built-in sealed deep groove ball bearing, maintenance-free
  • Wide range of bore sizes from 15 to 45 mm

Applications

  • Rotation detection in electric motors
  • Motor control in hybrid and electric vehicles

FAQ

Q. How do I select the bore diameter and pulse count for the Motor Encoder Unit (BMB/BMO Series)?
A. Bore diameter is 15 to 45 mm and resolution (pulse count) is 32 to 80. Specification differences are distinguished by the cable-included variants 008A and 108A.
Q. What are the outer diameter, maximum rotational speed, and mass ranges for the Motor Encoder Unit (BMB/BMO Series)?
A. Outer diameter is 35 to 85 mm, maximum rotational speed is 5600 to 14000 r/min, and mass is 0.07 to 0.53 kg.
Q. What applications can the Motor Encoder Unit (BMB/BMO Series) be used for?
A. It can be used for rotation detection in electric motors and for motor control in hybrid and electric vehicles.
Q. Does the Motor Encoder Unit (BMB/BMO Series) require maintenance?
A. It has a built-in sealed deep groove ball bearing and is maintenance-free.

Written by AI based on the content of the source documents.

Source documents

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