Boots – shoes – and leggings
Patent
1997-06-11
1998-11-17
Trammell, James P.
Boots, shoes, and leggings
36457103, 36457102, 36457105, 361 23, 361 24, 361 25, 361 28, H02H 700
Patent
active
058385916
ABSTRACT:
An apparatus is provided for controlling temperature of a motor by estimation. The temperature apparatus includes an initial setting circuit for setting an initial value of a temperature representative variable .theta., a temperature rise estimating circuit for calculating .theta.+A (where A is an incremental parameter reflecting a temperature rise under driving of the motor) for renewal of .theta. when the motor is driven, a temperature drop estimating circuit for calculating .theta.-.theta./S (where S is decremental parameter reflecting a temperature drop by heat dissipation of the motor) for renewal of .theta. periodically at a predetermined time interval while the temperature control apparatus is operating, and a power supply prevention circuit for preventing power supply to the motor when .theta. becomes no less than .theta.max (which is an upper limit parameter reflecting an upper tolerable limit temperature of the motor) and until .theta. becomes lower than .theta.max.
REFERENCES:
patent: 4616324 (1986-10-01), Simmel
patent: 5123081 (1992-06-01), Bachman et al.
patent: 5168415 (1992-12-01), Osuga
patent: 5283708 (1994-02-01), Waltz
patent: 5418677 (1995-05-01), Engel
patent: 5644510 (1997-07-01), Weir
Brother Kogyo Kabushiki Kaisha
Trammell James P.
Vo Hien
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