| 摘要 |
<p>A current transducer 8 comprising hall effect sensors 28a-e configured to sense a combined magnetic field arising from currents flowing in conductors 22a-d. The magnetic field arising from each conductor is sensed by hall effect sensors nearest each conductor. In operation, when currents flow in the conductors the hall effect sensors at either end of the hall effect sensor array sense a field based on the nearest conductor, those in the middle of the array sense a combined magnetic field arising from the two nearest conductors, each sensor outputs a voltage signal to a current determiner 12. The magnetic fields from current carrying conductors combine constructively or destructively in dependence on the phase offset between the consecutive currents. The current determiner can therefore derive the current flowing in any of the conductors based on the current flowing in one of the conductors and the combined signals from the rest. The current transducer can further comprise a memory configured to store known current data in relation to at least one of the currents. The current transducer can be used to determine currents flowing in a two, three or four phase electric motor, or a multi phase electric motor.</p> |
