This paper proposes an active low-frequency vibration control strategy based on harmonic voltage injection. By analyzing the theoretical mapping model between harmonic currents and radial electromagnetic vibration, it is revealed that injecting specific multiple-frequency harmonic currents can generate compensating force waves with controllable amplitude and adjustable phase. Based on this principle, specific frequency-multiplied harmonic voltage components are injected into the SVPWM control loop to generate the corresponding harmonic currents. This approach enables indirect harmonic current injection via voltage injection, thereby counteracting the target frequency vibration of the motor. Experimental results demonstrate that adjusting the amplitude and phase of the injected voltage can significantly reduce the amplitude of the motor's 6th-order vibration. This method directly counteracts vibration at the electromagnetic source and achieves effective current injection and vibration suppression solely through voltage signal regulation via the inverter.