| 摘要 |
The three-phase motor has two magnetic field sensitive elements spaced by 120 el. deg. They deliver control signals for connection of two phase windings. Output voltages of both sensitive elements are applied to a logic circuit which delivers control signals for connection of the third phase winding. The logic circuit is a summator which adds the output voltages of the two magnetic field sensitive elements. The summator can be in the form of an operational amplifier. Proportional amplifiers - which can also be in the form of operational amplifiers - can be switched between the field sensitive elements and the summator. |
