(19)
(11) EP 2 482 012 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.07.2014 Bulletin 2014/27

(43) Date of publication A2:
01.08.2012 Bulletin 2012/31

(21) Application number: 11195836.9

(22) Date of filing: 27.12.2011
(51) International Patent Classification (IPC): 
F25B 49/02(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 26.01.2011 US 201113014173

(71) Applicant: Hamilton Sundstrand Corporation
Windsor Locks, CT 06096-1010 (US)

(72) Inventors:
  • Giunta, Joseph A.
    Windsor, CT Connecticut 06095 (US)
  • Deroy, Robert M.
    Tolland, CT Connecticut 06084 (US)
  • Rusich, Richard
    Ellington, CT Connecticut 06029 (US)

(74) Representative: Tomlinson, Kerry John 
Dehns St Bride's House 10 Salisbury Square
London EC4Y 8JD
London EC4Y 8JD (GB)

   


(54) Compressor motor preheat control


(57) A method of controlling a vapor cycle system (10) having first and second compressors (14,16) includes operating the first compressor (14) to compress refrigerant while the second compressor (16) is idle, sensing a motor temperature of the second compressor (16), activating a preheating mode in which the motor (16-1) of the second compressor (16) is powered to generate heat when the motor temperature of the second compressor is below a lower temperature threshold, turning off the preheating mode when the sensed motor temperature of the second compressor (16) is above an upper temperature threshold, and limiting the maximum duration of the preheating mode to a preheating time period, such that the preheating mode is turned off after being activated for the preheating time period.







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