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Selection Procedures

Selection Procedures

Please specify your requests such as an encoder, connector and output shaft configuration as necessary. Products not listed in the catalog are also available.We also conduct OEM development. Please feel free to contact us.

♦ To make a best selection, it is necessary to select either a coreless, iron core or brushless motor in consideration of the power supply, control, running conditions, etc. If you want us to select one for you,please confirm the following conditions and contact our Sales.
♦ Power supply conditions
  ĚRange of voltage to use, rectified power supply or battery, need of current limiter.
  ĚNeed of PWM control, voltage fluctuation control, etc.
  ĚNeed of encoder.
♦ Running conditions (continuous, intermittent, forward/reverse, drive time, lock, short brake).
♦ Environmental conditions (temperature, atmosphere, etc.).
♦ Dimensional restrictions including the gearhead and encoder.
♦ A procedure to select a motor and gearhead using basic parameters presented by the customer will be explained below.
    [An example of basic parameters]
  Supply voltage U=12V
  Rated speed Nr=90min-1
  Rated torque Tr=40mNm
  Size (diameter, length) Φ16 mm max., length 50 mm max.
  Motor-based selection  
1. DC Motor output
    Calculate the motor output (W) based on the torque and speed that you require in your application.
    If you plan to use a gearhead, it is necessary to select a DC motor of an output calculated in consideration
    of the gearhead efficiency.
  For a target of 90min-1, assuming you select a DC motor speed of 9000min-1 and gear ratio of 1/100,
  calculate an output including the efficiency. (Spur gear 5 stages: 59%)
2. Voltage and size
    In consideration of the voltage supplied to the DC motor, size (diameter and length) and an output
    greater than the DC motor rated output calculated above, make a final section of a motor.
    Example:Model selected:SCR16-2502 (12V, 0.71W)
    Outside diameter Φ16mm, length 42.55mm total
    * See DC motor specifications on pages 12 to 14.
       See DC coreless motors on pages 29 to 42.
3. Gearhead selection
    Select a gearhead in consideration of the rated allowable torque and size (diameter and length).
    (The gearhead must be used below its rated allowable torque.) Select a gear ratio to achieve the
    required speed and allowable torque.
    Example:Model selected: RA-16R 1/97 (rated torque 49.1mNm, efficiency 59%)
    * See Gearheads on pages 51 to 67.
♦ This catalog contains the specifications of DC Gear motor to enable selection based on sizes or torque/speed of DC gear motors. The following simplified procedure can be used:
  Size-based selection  
     Where your product design poses restrictions on the size of a motor or gear motor or when you are currently
     using a DC motor or DC gear motor and are looking for an alternative, select a suitable motor based on
1. Rough selection based on size
    Make a rough selection based on the size (diameter and length) of the gear motor.
    Example:Model selected: Gearhead/RA-16R
    Model selected: DC motor/SCR16-2502
    Outside diameter Φ16mm, length 42.55mm total
    *A list of combination on pages 8 to 9.
2. Selection of gear ratio
    Confirm the power supply voltage to be supplied to the DC motor and select a gear ratio from the DC gear
    motor specifications, referring to the allowable rated torque and rated speed. (Please note that the torque to
    use actually must be lower than the rated torque of the DC gear motor.)
    Example:SCR16G-SR2502A-12, gear ratio 1/97
    89.7min-1, 44.9mNm
    * See DC Gear Motors on pages 69 to 120.

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