Brushless DC motors, 57 mm, with integrated controller, BLDC-3 Series

The BLDC-3 series is a complete and
fully operational drive system. Control
and power electronics are installed in an
aluminium housing that is mounted on a
brushless synchronous motor. The electronics
are internally connected to the
motor, thus the only wiring needed to be
done is for supply voltage and analogue
control signals.
This solution with an integrated drive
circuit installed on the motor rids any
time-consuming installation, and
electrical disturbance such as EMC is
minimised.

Motor
The motors in the BLDC-3 series are
Brushless synchronous motors in three
sizes with different performance. The
fourpole rotor consists of high energy
neodymium ring magnets that are
skewed for reduced cogging. The stator is
a single tooth wound three phase design
with one slot per pole and phase. Hall
elements provide feedback for the drive
and enable electronic commutation.
Each Hall element generates two pulses
per revolution, this adds up to totally six
pulses. This is commonly known as sixstep
commutation and is significant for
any brushless DC motor.
The rated torque is varying with size in
the region of 0.15–0.3 Nm, and the rated
speed of the motors is 3 000 rpm with
reference to a supply voltage of 24 V DC.

Drive
The power and control electronics include
logic circuits for electronic commutation
and speed regulation. An analogue signal
0–5 V DC controls the speed of the motor.
The drive can be set for both CW and CCW
rotation with a digital signal. A dynamic
brake is controlled by an analogue signal
input. A red-green light emitting diode
(LED) tells the status of the drive. A green
light shows that the motor is ready to
operate and a red light indicates that the
drive is disabled or that it has tripped.
Built-in thermal protection will disable any
operation if the temperature rises above
the rated value. If the protection has been
activated the drive must be reset with a
power down, and the temperature needs
to stay below the thermal limit in order to
continue any further operation. Thanks to
an effective conduction of heat away from
the drive, the motor’s performance will
not be limited by this solution.
An output of two Hall elements renders
the possibility to detect the position of
the rotor and the speed of the motor.
Each pulse output generates two pulses
for each mechanical revolution.