WARNING: The maximum shaft temperature is a function of permanent magnet characteristic limitation,
and should never be exceeded. Exceeding this limit can result in demagnetization of some or all of the
magnets inside the shaft.
Air-Natural Cooling Behaviour 5.1.1
For Air-Natural cooling, the forcer is installed without the external water jacket.
The forcer is intended to be operated which is a maximum winding temperature of
130°C. This 130°C is made up of an ambient air temperature of 25°C, a winding temperature rise of 100°C and a
winding hotspot allowance of 5°C. Under these conditions, the external surface of the forcer will reach a
temperature between 75 and 80°C. The performance figures for Air cooling in Section 5.1 are based on these
conditions.
Fluid Cooling Behaviour 5.1.2
For Fluid cooling, the forcer must be fitted with an external fluid cooling jacket. The forcer is intended to be
winding temperature of 130°C. This 130°C is made up
of a coolant temperature of 25°C, a winding temperature rise of 100°C and a winding hotspot allowance of 5°C.
Under these conditions, the external surface of the forcer (inside the jacket) will reach a temperature of
approximately 30°C. Table 5-2 shows the required flow rates for both Water and Oil in order to satisfy the fluid
cooling requirements.
Force vs. Speed Characteristics 5.2
In addition to the limits listed in Section 5.1, the maximum force achievable at a particular speed will be limited by
the voltage rating of the drive. The motor force limits as a function of velocity with DC bus voltages of 300V and
600V are plotted in the figures below.
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