By applying a 60 Hz motor to 50 Hz you (your customer) violates one of the
principles of building machines. The principle is that safe machines are built
using safe components. The latter cannot be guaranteed anymore, so the machine
is unsafe. Full stop. This is the agency way of safety thinking.
Let me try a slightly non-conventional approach to product safety:
An electric motor (in terms of risk) is nothing else but a long copper wire and
some iron, that in some mysterious way converts electrical hazards into
mechanical hazards and thermal hazards. The mechanical hazards seem to reduce
(slower speed), so I see no principal problem here. The electrical hazards are
not principally different at 50 Hz . What remains is a thermal hazard.
Inductances in 60 Hz motors are lower than 50 Hz motors, so currents rise
(120%), and so thermal copper dissipation. At 50 Hz eddy current related losses
are lower, but the increased magnetisation might compensate for that.
In the end, risks seem only thermal related. Adding a supplemental non
auto-resetting temperature protection may provide the (additional safety
protection layer) thermal safety your customers need.
Although not really hazard related, you should also consider the increased
start-up current.
Any
Regards,
Ing. Gert Gremmen
Approvals manager
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-----Original Message-----
From: Kunde, Brian [mailto:brian_ku...@lecotc.com]
Sent: Monday 26 September 2016 16:39
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Using 60hz motors in 50hz countries
Dear experts,
Can AC brushless motors (in this case 230V~ 3-phase 3hp motors) that are rated
"60HZ" be used in products going to countries that have 50HZ power? I believe
the motors will run a little slower which will not affect the function of the
product, but is there a safety issue with this? The motors are thermally,
overload, and short circuit protected. They are "intermittent use" and not
likely to overheat.
As a rule, we only market and sell such products to countries with 60hz power.
However, a North America company might purchase one and ship it to one of their
international locations with 50hz power without our knowledge. Do we need to be
concerned about this?
Of course, this fact has our sales force wondering if it is OK to market and
sell 60hz motor driven products in countries with 50hz. I really don't know. I
cannot see a safety issue but one can say that the motor would be used in a way
it is not intended to be used resulting in a higher risk if something did
happening.
Any opinions on this?
Thanks,
The Other Brian
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