Patent GB-191127588-A (GB)
Title: Improved Devices for Regulating the Speed of Machinery.
IPC: B66B1/26
Filed: 1911-12-08
Granted: 1912-12-09
Abstract: 27,588. Siemens Bros. Dynamo Works, [Siemens Schuckertwerke]. Dec. 8. Electric equipment.- To control the speed of hauling, hoisting, and like machines independently of the load, an adjustable inertia governor consisting of a rotary mass is used to vary the supply of energy. The electric motor m driving the machine has on its spindle or on a shaft connected thereto a heavy wheel s, Fig. 4, driven through the adjustable spring f. A variation in speed or an adjustment of the spring by the lever h, causes relative movement between the wheel and the spindle, and through contacts a, b carried by the wheel and spindle the circuit through the rheostatadjusting motor c is closed and the main motor m regulated. Instead of a direct drive through the spring between the wheel and the motor, differential gear may be introduced under the control of the spring, the spring and electric contacts being stationary. The lever h may be adjusted by hand or as shown in Fig. 4. The sleeve c to which the spring is attached is moved from the lever w acted on by cams o, q; these' cams tend to make the machine follow a predetermined speed law, the cam q being driven direct from the motor m, and the cam o through the differential gear placed between the motor m and the constant-speed motor u. In a modification, a water motor acts on the spring, the water being supplied from pumps driven by the main motor and a constant-speed motor; the differential action of two electro-magnets may be similarly used. The acceleration control may be used in combination with a speed-position control. For this purpose, the wheel s, Fig. 7, driven through the differential gear d, acts against the adjusting-spring f on the arm u of the reversing-switch k' of the rheostat motor e. Two cams sr, sl, one for each direction of working, show through the indicators zr, zl, the maximum permissible speed for any point in the travel. A pointer z showing the actual speed is worked from an electric speed indicator comprising a dynamo v1, on the main motor shaft supplying current to the magnets and armature v2 connected to the pointer z. If the indicator z overlaps either of the indicators zr, zl, a switch k<2> closes the circuit of an auxiliary motor su, which also acts on the reversing-switch of the rheostat motor. In a modification, a speed position indicator acts directly on the spring f. In a further modification, means similar to that described with reference to Fig. 4 for adjusting the spring is used in parallel with the wheel s, and acts directly on the switch for the rheostat motor; or a differential pumping-device comprising an adjustable pump, driven by a constant-speed motor, supplies water to another pump driven by the main motor. A motor receiving any water not circulating in these pumps acts with the wheel s on the rheostat. An electro-magnetic differential device may replace the water pumps and motor. The coiled spring for varying the force acting on the wheel s may be replaced by a pneumatic spring; or a brake mav be used on the wheel. The mass of the wheel may be varied by making it hollow and placing different amounts of liquid therein. The spring may be attached to a fixed point on the shaft, and the electric contacts made adjustable.