3.GRAPH OF POWER VS. SPEED
200
180
160
140
120
100
80
60
40
20
0
0
star
delta
100 Speed in20re0vs./minute (3rp0m0)
400
500
Caution
Take care when building and assembling the PMG so that the magnets cannot come
loose. This can happen under extreme circumstances. Loose magnets rubbing on the
stator can then destroy the PMG.
• Follow all the instructions for casting the magnet rotors - do not simply glue the
magnets to the steel disks.
• Do not hit the magnet rotors with hammers during assembly.
• Take care that there is at least 1mm gap clearance between the magnets and the
stator, on both sides. (For heavy duty, or high speed, use a larger gap.)
• Do not run the PMG at speeds faster than 800 rpm on a wind turbine. (When the
wind turbine yaws, large gyroscopic forces will flex the shaft, and the magnets
may touch.)
• Do not mount the rotor blade assembly directly onto the front magnet rotor disk,
at any point away from the studs. Mount it only onto the studs and nuts
themselves, which come through the disk.
• When mounting the PMG on the wind turbine yaw mount, keep the box section
'spine' of the PMG vertically upright, and not horizontally cross-wise.
PMG manual
page 7
June 2001