C2 Terrace Review — Wednesday, April 24, 1991

| Science Week activities |

April 24 - - physicist George VanderKuur will do a teachers’
workshop at Caledonia Sr. Secondary School | in the

home ec room

April 25 & 26 - George VanderKuur will do presentations
in schools throughout School District #88
April 26 - Judging of student entries in the Science Fair

© . (not open to the public)

April 27, 9:30 a.m. - 4:00 p.m. - 26th Annual Science Fair,

Caledonia Sr. Secondary School (exhibits and contests).
11:00 a.m. & 1:00 p.m. - public presentation by

physicist George VanderKuur

SIX-YEAR OLD Veritas student Emma Keating waters her

Sclence Week tree with an eye dropper.

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; JOHN DEERE |

. TRACTO!

JOHN DEERE CONSTRUCTION,
FORESTRY & UTILITY EQUIPMENT
4650 Keith Ave., Terrace, 635-7131

CHRIS MORTON is a 4th year Mechanical Engineering student at UBC. Chris designed and built
a low-power dynamometer for his work-term employer Powertech.

Co-op student builds low-power dynamometer

Chris Morton is a 4th year Mech-
anical Engineering student from
UBC and the son of Ken and
Lorna Morton of Terrace. Chris
graduated from Caledonia Sr.
Secondary School in 1985 as an
honours student and provincial
scholarship winner. He completed
his first year university require-

ments at Northwest Community|

College in Terrace.

Chris is now completing his final
co-op work term at Powertech. He
has completed all his academic
Tequirements, and on completion of
this final co-op work term, he will
obtain his Bachelors degree in
Mechanical Engineering. Chris
specialized . in} Computer-aided
automation which is one of a few
areas of specialization for mechan-
ical engineering undergraduates.

One of the services that Power-
tech provides its customers is the
testing of the rated capacity of
high efficiency 3-phase induction
motors. Powertech has a dyna-
mometer which will test motors in

the range of 5 HP to 20 HP. Due
to a demand for testing smaller
motors, a need was identified fora
dynamometer which would test
motors up to 5 HP.

Chris’ responsibility was do
design and build the dynamometer
for testing the smailer motors. This
consisted of three stages. First, he
had to decide the layout of the unit
and how he would load the motors
for testing. He chose between three
methods: hydraulic; an electrical
generator; or a friction brake. He
decided on the electric generator
because it has a low minimum
power and allows for good control
of the motor load.

Next Chris purchased a standard
12V automotive altemator which
he used to test his concept. Nor-

‘mally the output of the alternator

is rectified AC, regulated to 12V
by automatic control of the field
current, Chris obtained excellent
control of the alternator load out-
put by removing the regulator and
separately exciting the field wind-

ings using a variable DC power ”

supply he was able to use the 12V
alternator to test motors up to 1
HP. He then graduated to a 24V
automotive alternator which can
test up to 2 HP.

Currently there are four motors
in-house which need to be tested
for external clients, and Chris will
be using the dynamometer which
he designed and built to conduct
the tests. Frequently the motors are
imported from overseas and
Powertech’s role is to confirm that
the motor meets the rated capacity
claimed by the manufacturer. They
provide their customers with
unbiased testing which will assure
their customers that the manufac-
turers’ claims are true. Most tes-
ting that they conduct at present is
on high efficiency 3-phase induc-
tion motors, although they are
investigating testing single-phase
motors, as well. Congratulations,
Chris on a job well done.

With permission from "Pins"
Powertech Information & News,
Surrey, B.C.

Com

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