Reciprocating drive system for a body such as a carriage supporting electrostatic means for spraying a pulverized material, the system including an asynchronous squirrel cage motor
US4335342A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1979 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Dec 20, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B13/0447
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A reciprocating drive system moves a body of defined inertia, such as a carriage supporting electrostatic spraying means, at full speed between two points at which the direction of movement is reversed. The drive system includes an electric motor with polyphase stator windings and a squirrel cage rotor. Transducers responsive to the arrival of the moving body at the aforementioned points produce output signals controlling a phase switching system which reverses the direction of rotation of the motor. Reversal of the motor torque reverses the direction of movement of the moving body within a given travel and within a given time interval to full speed in the opposite direction. A stator current limiter provides positive coupling in an operative condition and no coupling in an inoperative condition with the motor running at full speed. The motor is selected so that the inertia of its rotor closely matches that of the moving body. The current limiting means are arranged to be in the operative condition irrespective of the position of the moving body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.