Electronic system of regulation of speed in both senses and stop of universal electric motors of low power. (Machine-translation by Google Translate, not legally binding)

摘要

Electronic speed regulation system, in both directions, and stop of low power universal electric motors, especially applicable to toys with electric drive, characterized in that it includes a control device constituted by a linear potentiometer, and an electronic control circuit, which has two ambivalent outputs for connection to the respective power supply with interleaving in one of them of the respective motor, but also having a central output connected to the cursor of the aforementioned potentiometer, arranged between the terminals of the power supply; this circuit uses low voltage rectifier diodes, as well as a thyristor whose trigger gate is connected to a zener diode, linked to a capacitor whose load voltage is a function of the said potentiometer, verifying that when the cursor of this occupies a central position, it does not become charged to the breaking voltage of the zener, the motor then remains stopped, while when moving it, the thyristor is triggered in the positive half-cycles or in the negative half-cycles according to the direction of said displacement; so that the power supply of the motor is achieved with a series of fractional, positive or negative impulses, respectively, whose value is a function of the firing angle of the thyristor, dependent on the displacement of the aforesaid cursor of the potentiometer. (Machine-translation by Google Translate, not legally binding)