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DC Motors

Glossary

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Nominal Voltage V

This value indicates the voltage at which all other specifications are measured.

Terminal resistance Ω

The electrical resistance measured across the motor terminals at room temperature.

Output power :1

Nominal gearhead reduction ratio.

Gearhead number of stage -

Number of stages in gearhead construction.

Max. output power, gearhead output

W

Max. mechanical output power achievable at nominal voltage from gearhead shaft.

Max. efficiency %

Motor converts electrical input power to mechanical output power. This conversion involves energy losses. Efficiency is the percentage indication of the input and output power conversion (gearhead included).

No-load speed, gearhead output

rpm

Number of rotations per minute at no-load condition when the motor is supplied with nominal voltage. The speed is measured at the gearhead output shaft.

No-load current mA

Current absorbed under no-load condition. This current is generated by mechanical friction losses in the motor and gearhead.

Stall torque, gearhead output

mNm

Torque produced at stall (starting) condition when supplied with nominal voltage (2 points measurement).

Friction torque mNm

Torque caused by friction losses in the motor and gear mechanism.

Back-EMF constant mV/rpm

This constant indicated the relationship between the induced voltage in the coil and the shaft speed. This value refers to the motor-gearhead combination.

Torque constant mNm/A

This constant indicates the relationship between the generated output torque and the absorbed current. This value refers to the motor-gearhead combination.

Coil inductance mH

The inductance measured across the motor terminals at 1kHz.

Mechanical time constant ms

This constant indicates the time required by the motor-gearhead combination to accelerate from standstill to 63.2% of the no-load speed.

Rotor inertia gcm2

Mass moment of inertia of the motor.

Gearhead length, L1 mm

Gearhead body length without motor.

Total length, L2 mm

Total length of the motor-gearhead combination.

Total weight mg

Total weight of the motor-gearhead combination.

Operating temperature range ℃ 

The most applicable temperature range.

Max. temperature rise at stall

℃ 

Max. motor temperature rise reached at stall when the motor is supplied with nominal voltage.

Bearing type

 

Type of bearing used for the gearhead. A special designed sleeve bearing construction has been used to reduce friction losses and to achieve long life operation.

Max. permissible press fit force, gearhead output N

Max. permissible press fit force at stand still (push only).

Max. radial play, gearhead output

mm

Max. shaft radial play measured at the gearhead output shaft side.

Max. axial play, gearhead output

mm

Max. shaft axial play measured at the gearhead output shaft side.



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