STANDSTILL HEATING UNIT FOR ELECTRIC MOTOR

RESISTANCE CHAUFFANTE POUR MOTEUR ELECTRIQUE

English Abstract

(57) Abstract
The invention concerns a standstill heating unit for an electric motor in particular for a canned motor designed to drive a
centrifugal pump. The standstill heater works off a reduced-voltage auxiliary power supply at a voltage which is lower than the
normal operating voltage and which is produced by phase-angle control, using semiconductors, of one or more of the phases of
the motor power supply.

Claims

1. Standstill heating unit for a canned motor for driving a
centrifugal pump, whereby the canned motor, while at standstill during
the heating phase, is supplied with a reduced auxiliary voltage that
is lower than the normal operating voltage, produced from the current
supply to the electric motor by phase angle control using
semiconductors, s o c h a r a c t e r i z e d, that the auxiliary
voltage is supplied from a Thyristor control equipped circuit of known
design, employed for smooth start-up, whereby the operating current is
so applied during the heating phase, that the rotor of the electric
motor does not turn, and whereby the reactive power filtered out
during motor start-up is supplementarily used during the heating phase
brought about by the circuit.

Description

RCV.9Y~DAR~Y ~ D~\R~V P.G : 1- S-i3 :lZ'l~PII: O~lTt"1~3~ t212i~53-~23~:11 1
.
T~ v~ ran~c~ oo ~ wo ~Z~151~4
` 9~/J~ ' Pc~ Vc~
D~orl~tlon
~tandatlll H-atln~ Vnlt 210 ~ 6 8 2 ~:
~h~ lnv~ntian cona-rn- ~ rt~nd-tlll hortino unlt ~or an lo^tr~c
motoY, ln u~rr-~ealnr f~r ~ ounn~d notor ror arlvln~ ~ cr~trlfu~l
pump, ~harobr th~ ulvrtllo morGr, ~hll- ln th~ ho~tlng PhaoY At
o~naet~ upvl~oa V1th a roduco~ ouxlll-~y ~o1t~oo, wbioh
low-r than th- nor~al apor~tlnq volt~g~
A hu-tlno ~rov1-~on of thl~ t~p- ir kno~n tram ~l-C-l OS6 252, ~b-r~ln
it ~-rv-o tor tb- baatlnq ot rn ~lootrlc ~oto- o~ ~-t or om1-~ot
eonotruetlvn ~hlcb oorvo~ ~ ~lanalaoa pumV mploy-a to convoy o ~dlu~
~hlch 1- In tho ll~u-d etate only ~hllo In tho b--t-d eon~Ltion, Th~
rotor o~ tho entlolpct-d el~ctrlc motor 1- o~ ~ho rkln--tt-ct tyvc
h~vlno e ~ronounc~d k~n-~ff-et, o d-~ign-v',, th~t ~pon o~ltch-ov~r ~o
tendot~ll, t~o ~n~/~r tbr-- motor Ph~ r- u~Dlla~ lrv^~ ~
r~n~crrm-r ~ ith olnvl- or tbrov PhN- r~ducaa tU~lllcrr voltnr~a
lch 1. lc~or th.~ tno nor~l oDor~tlnV voltn~o,'
Tnla tno of r~Lrlnd~tlll h~rctlno hn- th- rlv-rlt~g- th-t no ~t-rn-lly
nppllr nbla nuxl~lar~ m-ana r- n--rIac1 for wnrming ~nd/cr maJntalnln~
~h- Ir-rmth o~ th- motor lntorlor nd th-t throutn th4 ol~JctrIo l
h--tlnv ot tho roto~ oVaoo ln tha mo~or lntorlor dUrln~ ct~mdn~
Prcctlaa~ th- ldalltlc~l eK~cn~lon nnd npernrlng oonaItlon- ar-
r~-lntoIn-d oa durlng norr~l ov~rotIon
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Dla~av~nt~ aou~, ln the ancn ol thn antlall~otaa atanaatlll heatlD~
unlt no~-v-r lr~ tha clt~l~t~on ~n uhl~ th- tranatorm~r re~llr a
r~lIatlv-lr ~l~h coat na h~cOn~a -p~cLallr l~hlrla-. ~ In th~ c~a-
oi l-rg-r r~otorr~
''
Tho lnvontlon brlo Co ltr~ ob~ootlvo tho pro~ llrlon ~r ~ ~t~ndrt~ll
h~alln~l unIt ~ Ch ~vol~n t~l~ nao~ for an ~lt0rn~lly a~lloa ~arr~lng ~ -
oaurc- ~nlc no~lr~vr~r~ lnut-a Lrrroratm~t drIvan c0~t and whlcn
rJr th r~tor~ al-o b- ~plorad to r~dvrln~r r~- In tK r ~ Or l~rg-r
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Sh~ colutlon to tba pro~l~m at h-nd proceeda trom ~ ~t~ndatlll heQtlng
unle of th- above da~l~ rl~-d trp-, ~hr~qh an o~lxilLarr velt~g-
produo-d b~ r-~icor~ductor Fh~r- an~l- oontr~l of on- or ~orw pha~-~ of
tb- ourr-llt ul~r,~ly to ~h~ utrl~ mato~
Tho cn ~n~l~lo o~ vroauclna ~n 1U~ rY volt~ot ln ~aeoraaneo wlth chr~
~t~nd~t~ll h--tlng un~t propoa-d ny t~- lnv~ntlon la Kno~n thrau~h
l-otronlc t~rt~up co~trol~ tor lnductlon motor~ dv
"KSR-kl-atrcnic- 9t-rt-u~ ~ontrolo for Induetlo~ ~otort" by th~
C~m~ny ~T~ Kupvlung-teohnl~ ambN D~ 0 ~h-in- 1) ~u~h t-r~-u~
ControLo tlnd avplleatlon wh~r- a omooth ~tart-up o! a m~chin-, n
con~ryor bult q alla~na ~ata or eiJ~ e lnuta~l~tlon lo drivon by n
lnduct~on motor or troubl- ~r-- ~p~r~tlon In con~r~ot tu atart-uV
con~rol ho~-~-r, th- ~tnnd-t~ll h--~lng unlt ln aeooraanee ~rlth tho
inv~ncton do-~ not op-rnt~ with n br~k-nvvr ~f~otln~ ~t~rt-op
volt~g- nd a run-up time ol eontroll~d ~lvctrie ~otor
snc o~ana~ noatln~ unit ln accord~nc- t~ith thr lnv-ntion i- ind~-d
onpnal~ ar b~lrla nmutoy~ n- ~ omooch oL~rl-up ~uvLCv In n ~-onn~
~,o~lleatlon, ~n ~hieh tn- ov-ratlnv ourront ic ro contrallcd, how-v~r,
th~t the rotor oi th- l-etr~e m~t~ do~J rlot turn
turth~r ~dv~nt~v~u~ ~boalm~nt, tt Ic aaalrlonally vroPoi~d eha~
tn~ r~letlv~ po~rer thQt 1~ tlltacea out In Icnown utrlrt-uV aunLlo~ lr
alro employ-d durinq th- h-~tlng ph~J- nauln~ trom the e~ulDmcnt~
Thu- th- und~lr~d rG~ctiv- p~w~r durin; t~- u~rt-up VnQa~ nu~
auvQlern-nt~l ho~ting n~rgr
The atandotill k-~tlna unlt ln aeCoraar.eo ~lth th~ in~roDtion adaPtc
r to exl~tlnq ln-tallatLonr~ tt can ~oo r~adlly rotro-~ittad to
motor~ ~lr-~dy ~.:1 op~lr~tlon . Thu~ i c mny, ~or ~xam~lq, ~ lno~rt~d in
th-rTall~ m-7n~to~-d ~e~ndArd m~tor~ or ln therm-11r rnonitor-d aAnnlld
motor pumpl~ wlth ~plo-loa proof proviJLon~
.
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