Low-Voltage Hardware Set Components; Drm028 - Rev - Motorola M68HC08 Reference Manual

Hardware Design

4.6 Low-Voltage Hardware Set Components

4.6.1 3-Ph AC/BLDC Low Voltage Power Stage
Designer Reference Manual
72
Freescale Semiconductor, Inc.
Table 4-5. Characteristics of the BLDC motor
Voltage Constant
Winding Resistance
Winding Inductance
Continuous Current
Peak Current
Inertia
Thermal Resistance
Motorola's embedded motion control series low-voltage (LV) brushless
DC (BLDC) power stage is designed to run 3-ph. BLDC and PM
Synchronous motors. It operates from a nominal 12-volt motor supply,
and delivers up to 30 amps of rms motor current from a dc bus that can
deliver peak currents up to 46 amps. In combination with one of
Motorola's 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 a
wide variety of algorithms for controlling BLDC motors and PM
Synchronous motors.
Input connections are made via 40-pin ribbon cable connector J13.
Power connections to the motor are made with fast-on connectors J16,
J17, and J18. They are located along the back edge of the board, and
are labeled Phase A, Phase B, and Phase C. Power requirements are
met with a 12-volt power supply that has a 10- to 16-volt tolerance.
Fast-on connectors J19 and J20 are used for the power supply. J19 is
labeled +12V and is located on the back edge of the board. J20 is
labeled 0V and is located along the front edge. Current measuring
circuitry is set up for 50 amps full scale. Both bus and phase leg currents
are measured. A cycle by cycle overcurrent trip point is set at 46 amps.
Hardware Design
For More Information On This Product,
Go to: www.freescale.com
K
— 8.4
e
R
— 2.8
t
L — 8.6
I
— —
cs
I
— —
ps
J — 0.075
m
— —
— V/kRPM
—
— mH
2 A
5.9 A
2
— kgcm
3.6 C/W
DRM028 — Rev 0
MOTOROLA