Motorola M68HC08 - Manual (Page 70)

Hardware Design
Designer Reference Manual DRM028 — Rev 0
70 Hardware Design MOTOROLA
4.4.3 3-phase BLDC High Voltage Motor with Motor Brake
The High Voltage BLDC motor-brake set incorporates a 3-phase High
Voltage BLDC motor and attached BLDC motor brake. The BLDCmotor
has six poles. The incremental position encoder is coupled to the motor
shaft, and position Hall sensors are mounted between motor and brake.
They allow sensing of the position if required by the control algorithm.
Detailed motor-brake specifications are listed in
Table 2-2 , Section 2.
4.5 Low-Voltage Evaluation Motor Hardware Set Components
4.5.1 EVM Motor Board
Motorola’s embedded motion control series EVM motor board is a
12-volt, 4-amp, surface-mount power stage that is shipped with an MCG
IB23810-H1 brushless dc motor. In combination with one of the
embedded motion control series control boards, it provides a software
development platform that allows algorithms to be written and tested
without the need to design and build a power stage. It supports
algorithms that use Hall sensors, encoder feedback, and back EMF
(electromotive force) signals for sensorless control.
The EVM motor board does not have overcurrent protection that is
independent of the control board, so some care in its setup and use is
required if a lower impedance motor is used. With the motor that is
supplied in the kit, the power output stage will withstand a full-stall
condition without the need for overcurrent protection. Current measuring
circuitry is set up for 4 amps full scale. In a 25
ο
C ambient operation at up
to 6 amps continuous RMS output current is within the board’s thermal
limits.
Input connections are made via 40-pin ribbon cable connector J1. Power
connections to the motor are made on output connector J2. Phase A,
phase B, and phase C are labeled on the board. Power requirements are
met with a single external 12-Vdc, 4-amp power supply. Two connectors,
labeled J3 and J4, are provided for the 12-volt power supply. J3 and J4
are located on the front edge of the board. Power is supplied to one or
the other, but not both.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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