An elevator door drive (10) comprising: an elevator door motor (15); and an elevator door controller (20) comprising at least one button (21); wherein the elevator door controller (20) is arranged to generate a Pulse Width Modulation (PWM) drive signal for driving the elevator door motor (15); wherein the elevator door controller (20) is arranged to provide an acoustic frequency PWM signal (32) to the elevator door motor (15) responsive to a press of the at least one button (21). When the elevator door motor (15) is provided with a PWM signal in the acoustic range, the current passing through the motor windings generates forces that result from that current and the magnetic fields in the motor. These forces excite vibrations in the motor components that generate audible noise (which may be referred to as audible magnetic noise or electromagnetic acoustic noise). The deliberate provision of an acoustic frequency PWM signal (32) to the elevator door motor (15) is used here to generate audible magnetic noise in the motor intentionally, in order to provide a feedback mechanism to the user. Thus the motor is essentially being used as a loudspeaker to communicate information (42) to the user.
ELEVATOR DOOR DRIVE CONFIGURED TO PRODUCE AN ACOUSTICAL FEEDBACK SIGNAL
AUFZUGSTÜRANTRIEB KONFIGURIERT DAZU EINE AKUSTISCHE RÜCKMELDUNG ZU PRODUZIEREN
ENTRAÎNEMENT DE PORTE D'ASCENSEUR CONFIGURÉ POUR PRODUIRE UN SIGNAL DE RETOUR ACOUSTIQUE
2021-01-27
Patent
Electronic Resource
English
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