MSK4412_15 Datasheet, PDF (1/5 Pages) M.S. Kennedy Corporation – 42V Maximum Supply Voltage: +28V Nominal

MIL-PRF-38534 CERTIFIED
40 AMP, 42V, SENSORLESS
3 PHASE BRUSHLESS DC
M.S.KENNEDY CORP.
MOTOR SPEED CONTROLLER
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
42V Maximum Supply Voltage: +28V Nominal
40 Amps DC @ 70°C Case Temperature
Sensorless Operation - No Hall Sensors Need for Commutation
Shoot-Through/Cross Conduction Protection of Output Bridge
Back EMF, Zero Crossing Detection Used for Commutation
Pulse - by - Pulse 50 Amp Current Limit
Open Frame PC Board Construction and Mounting
Brake Function
Forward / Reverse Selectable
DESCRIPTION:
4412
[phone]
The MSK 4412 is a brushless DC motor speed controller that is sensorless in operation. It uses back EMF (BEMF) from
the motor to sense when to commutate. It does not rely on hall sensors for commutation. Because of the reliance on BEMF,
the motor has to be turning at a minimum speed to produce enough BEMF to sense when to commutate. During startup, the
motor is first "locked" in a known commutation state. The motor is then "open loop" force commutated at a very slow rate
with increasing speed while checking for sufficient BEMF for closed loop commutation. Speed can be reliably controlled
from that point to full speed. Speed is controlled by PWM duty cycle to change the voltage seen by the windings. There is
a logic pin for changing direction, and also a pin for BRAKE. BRAKE halts PWM and commutation, and turns on all three low
side MOSFETs. This action effectively shorts out any BEMF generated by the motor and acts as a resistance to turning. The
MSK 4412 comes in an "open frame" PCB style module, meant to be bolted to a heatsink or bulkhead for dissipating output
power.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Fan / Blower Speed Control
Propulsion Control
Robot Traction Velocity Control
UAV Motor Speed Control
Variable Speed Pump Control
PIN-OUT INFORMATION
PCB PADS
L 1 - A PHASE OUT
L 2 - B PHASE OUT
L 3 - C PHASE OUT
V+ - +28V IN
VRTN - +28V GROUND RETURN
1
HEADER CONNECTION
1 - GROUND
2 - +5V
3 - NC
4 - NC
5 - NC
6 - BRAKE
7 - DIR
8 - SPEED
9 - NC
8548-22 Rev. A 1/11