Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Generators or Motors

Electric-motor-and-motor-control-system

Rotary electric machine stator having individual removable coils

In particular, the invention makes it easier to manufacture stators with windings on teeth, i.e. in ...

Method for assembling and electrical connector assembly for a power tool

OF THE PREFERRED EMBODIMENT A terminal member assembly 10 embodying the invention and for use in a ...

Vehicle AC generator

Therefore, a main object of the invention is to provide an improved vehicle AC generator which can ...

Motor and a lateral pressure mechanism for the same

It is an object of the invention to provide a lateral pressure mechanism for a motor which can ...

Cooling fan

The main objective of the present invention is to provide a cooling fan which is easy to assemble, ...

Fluid management system for a housing of an electrical device

The present invention pertains to a fluid management system incorporated into the construction of a ...

Bearing structures for motors

The present invention has been accomplished to solve such problems of the prior art as mentioned ...

Light weight machine with rotor employing permanent magnets and consequence poles

OF A PREFERRED EXEMPLARY EMBODIMENT Referring to FIGS. 1 and 2, a lightweight portable generator ...

Support for a cooling fan

The main objective of the invention is to provide an improved support for a cooling fan, which has ...

Acoustic isolator for a disc drive assembly

The present invention provides an improved acoustic isolation apparatus comprising an acoustic ...

Electric motor and motor control system

Details

Inventors: Alvaro, Nicolino; Acquaviva, Sebastiano;
Assignee: Plaset SpA (Moncalieri, IT)
Primary Examiner: Masih; Karen
Assistant Examiner:
Attorney, Agent or Firm: Howrey, Simon, Arnold & White, LLP

The system comprises sensors (PS) for detecting the angular position of the rotor (R) of the motor and a driver circuit (DC) arranged to control conduction in the controlled switches (SW) associated with the phases (W) of the motor and in a regulation switch (RSW) in predetermined manner in dependence on the position signals emitted by the sensors (PS). The regulation switch (RSW) is driven in an on/off manner by means of a square-wave signal. The system further comprises a protection circuit (PC) with a capacitor (C) connected to the control input of the regulation switch (RSW) so that the capacitor (C) is charged each time the regulation switch (RSW) is made conductive by the square-wave signal in operation, and with a control switch (T) connected between the control input of the regulation switch (RSW) and a pole (GND) of the direct-current supply and having a control input connected to the capacitor (C). The control switch (T) is made conductive and cuts off the regulation switch (RSW) when the latter remains conductive continuously for a period of time longer than a predetermined period.

DETAILED DESCRIPTION This and other objects are achieved, according to the invention, by a system of the type specified above, characterized in that it includes a protection circuit including: a capacitor coupled to the control input of the regulation switch so that the capacitor is charged each time the regulation switch is made conductive by the square-wave control signal in operation, and a control switch connected between the control input of the regulation switch and the other pole of the direct-current voltage supply and having a control input connected to the capacitor so that the control switch is made conductive and cuts off the regulation switch when the latter remains conductive continuously for a period of time longer than a predetermined period.
Among other things, the protection circuit of the control system according to the invention advantageously protects the regulation switch should the rotor of the motor be stopped in operation.

Related patents

	Electronically commutated motor The electronically commutated motor 110 according to FIG. 1 has two stator winding phases 112, 114 and a (schematically illustrated) permanent magnet rotor 116, in ...
	Brushless motor control device and equipment using the control device A feature of the present invention for achieving the objects described above is characterized in the fact that a first information signal pattern is stored into an ...
	Turbopump with actine suspension for a propulsion system It is the object of the present invention to overcome the aforesaid drawbacks and to propose a turbomachine, and in particular a turbopump, which has all the advantages ...
	Magnetic bearing apparatus An object of the present invention is to provide a magnetic bearing apparatus capable of preventing touchdown bearings from being damaged at the time of emergency stop ...
	Ceiling fan OF A PREFERRED EMBODIMENT OF THE INVENTION The fan of the invention includes a canopy 10 by which the fan is mounted in a flush position against the ceiling. The canopy ...
	Waterproof overhead fan As shown in FIGS. 1 and 3, an overhead suspended fan in accordance with the invention includes an upper mounting structure generally indicated at 10, a hollow support ...
	Spiral fluted wheel for a water pump The main objective of the invention is to provide a spiral fluted wheel for a pump that can be combined rapidly and precisely. The spiral fluted wheel has a top plate, a ...
	Insulation element and method for introducing winding elements into grooves on an armature Because the insulator element of the invention has at least one plastic element that is intended for lining an armature slot, the lining process can be performed quickly,...
	Electromagnetic vibrator and portable device employing the same The present invention addresses the problems discussed above and aims to contribute to realizing such devices having well-advanced. An electromagnetic vibrator of the ...
	Axial flow fan having a compact circuit board and impeller blade arrangement Accordingly, it is an object of this invention to provide an axial flow fan with reduced axial width while maintaining performance parameters and design constraints. An ...

0.054
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved