Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1975-12-08
1978-04-18
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318387, H02P 104
Patent
active
040853560
ABSTRACT:
The armature of the model electric locomotive motor is connected as one arm of a bridge circuit having a D.C. supply voltage. When the armature is held to prevent rotation, the bridge is balanced by means of resistors in the other arms so that no voltage appears across the output. When the armature then rotates the voltage across the bridge output is the back EMF produced by the rotation of the armature. A variable reference voltage obtained from the same D.C. power source is introduced opposing the back EMF and the resultant is used to control the current between the power supply and the bridge. The armature back EMF is thereby held by the bridge balance essentially equal to the reference voltage and if a heavy load is applied to the armature shaft the resultant bridge unbalance will retain the desired armature rotational speed constant irrespective of load changes, but variable directly with the applied reference voltage.
Acceleration control is achieved by introducing a capacitor-resistor circuit in the output of the reference voltage circuit to simulate the acceleration performance in railroad trains. Braking control is achieved by an additional transistor-capacitance-resistor circuit added to cause a controlled deceleration rate when the reference voltage is set back to zero thus simulating the actual braking effect in train air brake systems.
REFERENCES:
patent: 2974268 (1961-03-01), Blake et al.
patent: 3064174 (1962-11-01), Dinger
patent: 3838324 (1974-09-01), Watanabe
patent: 3909686 (1975-09-01), Brodhag et al.
Brown Laurence R.
Dobeck B.
Mutter Michael K.
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