Main Motor Control System; Pattern Generator - Brother Pe-150 Service Manual

5.

MAIN MOTOR CONTROL SYSTEM

The main motor must operate at a constant speed regardless of load fluctuations, temperature fluctuations, or
other changes in operating conditions. The main motor is therefore driven by means of PWM (Pulse Width
Modulation) control.
6.

PATTERN GENERATOR

This embroidery machine stores the pattern data to memory, and drives the embroidery frame using the X and Y
pulse motors to produce the patterns. It is therefore possible to increase the number of stored patterns and the
total number of stitches by simply increasing the storage capacity of the embroidery machine.
Good positioning and response speed are also required of the pulse motors used in this machine because the
embroidery frame must be moved and stopped in a precise position while the need is up. A PM-type pulse motor
is therefore used with a simple open loop circuit configuration to drive the embroidery frame in this machine.
Pattern generator control block diagram
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