Electric floor cleaner with a soft start function

Details Electric floor cleaner with a soft start function Electric floor cleaner with a soft start function

1989-09-11

1991-02-12

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318430, 318781, 318803, 318809, 363 36, 363 49, H02P 126

Patent

active

049927183

ABSTRACT:
An electric floor cleaner is of the type arranged to drive a three-phase motor, whose rated voltage is substantially equal to a voltage obtained by voltage doubling and rectifying a single-phase commercial power line and then by converting a voltage doubled d.c. voltage into three-phase a.c. by an inverter. The voltage and frequency of the three-phase a.c. output from the inverter are controlled for a predetermined period of time after a power switch is put into a turned on state from a turned off state. It is therefore possible to reduce the starting current to a small value enabling the use of a larger rated output motor than a motor in a conventional system within an allowable current limit of a commercial power line.

REFERENCES:
patent: 3733543 (1973-05-01), Retting
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4315305 (1982-02-01), Siemon
patent: 4328454 (1982-05-01), Okuyama et al.
patent: 4469997 (1984-09-01), Curtiss et al.
patent: 4482031 (1984-11-01), Yoshida et al.
patent: 4845607 (1989-07-01), Nakao et al.

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