User manual

User Manual SCA-SS-70-10
ElectroCraft
®
E-Mail: [e-mail] www.electrocraft.com May 2009
30
Tacho Mode
In the tacho mode the feedback information is coming as a voltage signal from a tacho
mounted at the motor.
Torque mode
In this mode the driver controls only the current into the motor. The speed of the motor
depends on the load because only the output force of the motor is regulated.
Voltage Mode
In the voltage mode the drive is watching the output voltage as a feedback voltage.
Brushed motor
In brush type motors, commutation is done electromechanically via the brushes and
commutator.
Commutation
Is a term which refers to the action of steering currents or voltages to the proper motor
phases so as to produce optimum motor torque. In brush type motors, commutation is done
electromechanically via the brushes and commutator. In brushless motors, commutation is
done by the switching electronics using rotor position information obtained by Hall sensors.
Back EMF
The voltage generated when a permanent magnet motor is rotated. This voltage is
proportional to motor speed and is present regardless of whether the motor winding(s) are
energized or de-energized.
Brushless motor
A Class of motors that operate using electronic commutation of phase currents, rather than
electromechanical (brush-type) commutation. Brushless motors typically have a permanent
magnet rotor and a wound stator.