Patent GB-364162-A (GB)
Title: Improvements in and connected with electric regulators
IPC: H02P9/16
Filed: 1930-10-02
Abstract: 364,162. Variable speed generator systems. STONE & CO., Ltd., J., Deptford, Kent, and HONEY, A. E., 31, Seymour Gardens, Ilford, Essex. Oct. 2, 1930, Nos. 29516/30 and 8893/31. [Class 38 (iv).] Regulation, automatic.-An electric regulator particularly for train lighting installations of the type described in Specification 330,510, [Class 38 (iv), Electrical supply and transmission systems &c.], comprises an electric motor variable in speed with variation of an electrical quantity in the installation driving a governor which actuates principal and auxiliary contact means respectively for regulating the voltage or current of the installation and for exercising a progressive adjustment or compensation upon the motor. A generator 1 is regulated by a variable speed motor 19 which has in addition to a permanent magnet 8<1> an auxiliary field magnet 8 provided with a winding 10 in series with the generator supply, a polarizing winding 9 in parallel with the generator, and a winding 11 in series with the generator field. A resistance 13 in parallel with the winding 11 diverts a variable portion of the field current so that the motor field is progressively adjusted. A lamp voltage regulator 7 as described in Specification 330,510 may be used in conjunction with the regulator so that battery current and lamp voltage regulation can be effected. In a modification battery current and lamp voltage control is obtained by means of one regulator having five-field windings, the two extra windings corresponding to the windings 20, 21 on the motor of the lamp voltage regulator 7. Figs. 3 and 4 show constructional details of the regulator. The governor has weights which move a sliding collar 29 against compression springs 30, 31. Spring 31 begins to act at the moment when cut-in takes place and the brushes 42 move on to the contacts 14, 15. The resistance contacts are mounted parallel and are each formed by flat strips separated by mica, assembled on an insulating sleeve, clamped by a rod 49 and supported by pillars 50. The resistance elements are connected to the staggered outer ends of the contact strips. A sliding bar 39 carrying brushes 42 is connected by links 34, 35, 37 to the governor sleeve 29. To operate a cut-in switch the bar 39 has a crossbar with rollers 53 which engage spring-pressed arms 56. The cam faces 55 on the arms 56 are so designed that for a position of the bar 39 corresponding to a certain voltage the rollers 53 allow the arms to rotate sufficiently for the switch blades 63 to engage. In an alternative arrangement shown in Fig. 8 for obtaining a rapid make and break the switch arm 66 has an operating spring 70 which is rocked through a dead centre position by a roller 65 on the bar 39. In another modification shown in Fig. 9 a generator 1 supplying a battery 2 and a lamp load 3 is controlled by a motor 82 that has a field winding 83 shunted across the supply and a demagnetizing winding 81 connected to the supply through a resistance 80. When charging the battery 2, as the voltage rises the contact 74 moves to the right to insert resistance 78 in the generator field, but to prevent the speed of the motor 82 reducing, the resistance in series with the demagnetizing winding 81 is proportionately reduced. A spring catch 88 engaging teeth 89 on the bar cause the brushes to be advanced intermittently by amounts corresponding to the pitch of the contacts 76, 77. To prevent a suddenly applied lamp load being taken from the battery when the generator is running, a relay 84 is provided, having a winding 85 in shunt across the generator supply and a winding 86 in series with the battery supply. If current flows from the battery to the load the winding 86 has a demagnetizing effect and the relay opens. This breaks the circuit to the motor 82 causing the regulator to reset to its initial position. The generator voltage will increase, the relay 84 reclose and the regulator reset itself to take account of the new load. Instead of employing the relay 84, the auxiliary magnet of the regulator motor might have a further magnetizing winding in series with the load circuit 3. Also, instead of resistance being removed from the circuit of the winding 81 it may be inserted in the circuit of this magnetizing winding.