초록 ▼

An electromagnetic contactor or controller is taught in which the voltage which is impressed across the electromagnetic armature accelerating coil is compared by a microprocess against a menu of memory stored voltages with related delay angles. The delay angles are utilized to alter the conduction i

An electromagnetic contactor or controller is taught in which the voltage which is impressed across the electromagnetic armature accelerating coil is compared by a microprocess against a menu of memory stored voltages with related delay angles. The delay angles are utilized to alter the conduction interval of a triac or similar gated device which is connected in series circuit relationship with the coil in question. During an ACCELERATION interval a number of consecutive full-wave rectified half-cycles of voltage pulses are phase angle or delay angle controlled so that the amount of energy provided to the moving armature of the contactor is approximately sufficient to cause the armature to abut a fixed magnetic member. Furthermore, there is provided a separate memory menu for mid-flight adjustment of the armature to compensate for unknown variations to fine tune the closing operation. This latter correction is known as COAST. There is also provided a GRAB function which supplies limited, relatively low level current to the armature at or near the time of abutment for preventing “bounce”. Mechanically, interconnected with the armature is a set of contacts which are caused to close upon an external circuit for providing a useful function in response to the movement of the armature.

대표청구항 ▼

An electrical contactor, comprising: first contact means; second contact means for being moved into a disposition of electrical continuity with said first contact means; electromagnet means with movable armature means which is mechanically interconnected with said second contact means for moving sai

An electrical contactor, comprising: first contact means; second contact means for being moved into a disposition of electrical continuity with said first contact means; electromagnet means with movable armature means which is mechanically interconnected with said second contact means for moving said second contact means into said disposition of electircal continuity with said first contact means in response to the flow of current pulses through a winding of said electromagnet means which current pulse are driven by controlled voltage pulses the amplitude which is free to vary within limits; spring means disposed to resist the movement of said armature means, the resistance being overcome when a predetermined minimum amount of kinetic energy is applied to said armature means; and means for supplying electrical power to said winging of said electromagnet means, wherein N of said controlled voltage pulses are provided to said winding, where one of said pulses is conduction angle controlled and adjustable as a function of said voltage amplitude so that the total amount of said kinetic energy which is supplied to said armature means during movement thereof as the result of said electrical current pulses flowing in said winding is substantially equal to said predetermined minimum amount of kinetic energy.