Cost-effective measurement of large machine currents

Electricity: motive power systems – Automatic and/or with time-delay means – With respect to a fixed standard – master or reference device

Reexamination Certificate

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C318S474000

Reexamination Certificate

active

06917174

ABSTRACT:
The increasing use of electrically powered vehicles has created a need for inexpensively and effectively measuring high currents for motor control, as for example digital motor control. Because the high operating voltages of traction motors, the motor current sensors should be non-contacting. A non-contacting current sensor having a rated capacity significantly less than the motor winding current is coupled to one or more of the conductors of a paralleled multiconductor motor winding for sensing the current in that conductor. The paralleled electrical motor conductors are paralleled by additional similar conductors, so that only a fraction of the current to be measured flows through the conductor(s) associated with the sensor. The current sensor elements may be mounted on a pc board, which supports the elements, and also has one or more printed patterns which define conductors associated with the sensor.

REFERENCES:
patent: 4841213 (1989-06-01), Tomasek
patent: 4952853 (1990-08-01), Archer
patent: 5530303 (1996-06-01), Takei
patent: 6528960 (2003-03-01), Roden et al.

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