| 摘要 |
794,704. Electric motors. SVENSKA AKTIEBOLAGET GASACCUMULATOR. Oct. 2, 1956 [Oct. 20, 1955], No. 30000/56. Class 35. [Also in Groups XXXVII and XL (c)] A three-phase motor has a stator winding 12 which forms the oscillator coils 1-3 of a transistor arrangement for converting D.C. into A.C. to drive the motor. The junction between the three stator windings is connected to the negative terminal of a D.C. source and the free end of each winding is connected to the collector electrode of a transistor 4, 5 or 6. The emitter electrodes are connected to a positive terminal of the D.C. source, the transistors being connected mutually in cascade over phase-delay networks comprising resistors 7 and capacitors 8, these elements substantially determining the frequency of the current delivered by the converter. Suitable control current for the base electrodes is also applied through these networks. The motor may be used for driving a gyroscope comprising a disc 9 with pivots 10 for suspension in a gimbal ring. A case 11 is pressed into a central hole in the disc and supports the stator with the windings 12. The rotor comprises cup members 13, 14, which are held together by an axle 15 turning in the case 11. The circuit elements 16, 17, of the converter are attached to the disc 9. The two leads between the converter and voltage source pass through point contacts 18, 19, and the circuit elements are placed close to the centre of rotation of the motor in order to obtain a large moment of inertia within a limited space. |
