The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2011
Filed:
Mar. 13, 2006
Takao Okada, Hikone, JP;
Takao Okada, Hikone, JP;
Fujitec Co., Ltd., Shiga, JP;
Abstract
An elevating machine control apparatus controls an inverter () to drive an AC motor () connected to the inverter () with AC power, and energizes a power generation braking resistor () to apply a brake during regenerative operation of the AC motor (). The apparatus prohibits the elevating machine from starting operating and interrupts power supply to the power generation braking resistor () if the DC stage voltage of the inverter () has a ripple quantity of a set value or more when the elevating machine is being stopped. Alternatively, the apparatus commands the elevating machine to stop operating and interrupts power supply to the power generation braking resistor () if the DC stage voltage of the inverter () during regenerative operation is a reference value or less when the elevating machine is in operation.