Coin Linear Vibration Motors (LRA’s)
Due to their fast Rise and Fall times, linear resonant actuators (LRA) vibration motors are an excellent choice for haptic / tactile feedback applications such as wearables and medical devices such a 250 hz vibrating gloves for Parkinson’s disease.   Their simple internal construction offers high reliability and exceptionally long life when compared with brush type ERM coin vibration motors.  It should be noted that  LRA’s can not survive the high temperatures of a reflow oven and hence we do not offer a SMD reflow version.   HERE to see a cross section of a typical LRA and HERE for a comparison of LRA’s vs. Brush Type Motors. LRA’s are unique in that they can be driven at very low voltage levels ( ~ 0.1 Vac ) with a current as low as 12 ma,  allowing engineers to tailor the vibration level to the minimum required, thus extending the devices battery life. Usability studies should to be conducted to determine the minimum acceptable  level of vibration G force for the application, and then the Haptic Driver IC programmed accordingly.

Part Number	Old P/N (see PCN)	Image	Tech. Type	Config. Type	Motor Size (mm)		Voltage		Current (mA)		Response Time (ms) - 50% of power - w/o Haptic Driver		Res. Freq (hz)	Vibe Force (Grms)
					Dia	Thickness	Rated	Operating	Rated MAX	Typical* Avg.	Rise Time	Fall Time
VG0640001D	G0640001D		LRA	4	6.0	4.05	1.8 Vac	0.5~1.8 Vac	75	58	15	70	210	0.90
VG0640002D			LRA	3	6.0	4.05	1.8 Vac	0.5~1.8 Vac	75	58	15	70	210	0.90
VG0825001D	G0825001D		LRA	1	8.0	2.55	1.2 Vac	0.1~1.2 Vac	60	48	50	50	240	0.60
VG0825001U			LRA	1	8.0	2.55	1.8 Vac	0.1~1.9 Vac	90	66	50	80	240	0.70
VG0832008	G0832008		LRA	4	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832009L			LRA	2	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832012	G0832012		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832013D	G0832013D		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832014L	G0832014L		LRA	8	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832019D			LRA	2	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	35	65	235	1.80
VG0832022D	G0832022D		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0840001D	G0840001D		LRA	1	8.0	4.05	2.0 Vac	0.1~2.0 Vac	90	68	12	55	170	1.80
VG1040003D	G1040003D		LRA	3	10.0	4.0	2.5 Vac	0.1~2.5 Vac	170	145	10	50	170	2.00
VG2080001H			LRA	4	20.0	8.0	1.8 Vac	1.0~2.0 Vac	200	170	20	60	130	>1.80
VG2230001H			LRA		22.0	30.0	2.0 Vac	0.1~3.0 Vac	100	95	60	100	70	>3.50

Part Number	Old P/N (see PCN)	Image	Tech. Type	Config. Type	Dia (mm)	Thickness (mm)	Rated (V)	Operating (V)	Rated MAX (mA)	Typical* (mA)	Rise Time (ms)	Fall Time (ms)	Res. Freq (hz)	Vibe Force (Grms)
VG0640001D	G0640001D		LRA	4	6.0	4.05	1.8 Vac	0.5~1.8 Vac	75	58	15	70	210	0.90
VG0640002D			LRA	3	6.0	4.05	1.8 Vac	0.5~1.8 Vac	75	58	15	70	210	0.90
VG0825001D	G0825001D		LRA	1	8.0	2.55	1.2 Vac	0.1~1.2 Vac	60	48	50	50	240	0.60
VG0825001U			LRA	1	8.0	2.55	1.8 Vac	0.1~1.9 Vac	90	66	50	80	240	0.70
VG0832008	G0832008		LRA	4	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832009L			LRA	2	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832012	G0832012		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832013D	G0832013D		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832014L	G0832014L		LRA	8	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0832019D			LRA	2	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	35	65	235	1.80
VG0832022D	G0832022D		LRA	1	8.0	3.25	1.8 Vac	0.1~1.85 Vac	80	58	50	80	235	1.80
VG0840001D	G0840001D		LRA	1	8.0	4.05	2.0 Vac	0.1~2.0 Vac	90	68	12	55	170	1.80
VG1040003D	G1040003D		LRA	3	10.0	4.0	2.5 Vac	0.1~2.5 Vac	170	145	10	50	170	2.00
VG2080001H			LRA	4	20.0	8.0	1.8 Vac	1.0~2.0 Vac	200	170	20	60	130	>1.80
VG2230001H			LRA		22.0	30.0	2.0 Vac	0.1~3.0 Vac	100	95	60	100	70	>3.50

 

Our coin shaped linear resonant actuators oscillate along the Z axis, perpendicular to the motors surface. This Z axis vibration efficiently transmits vibrations in wearable applications. In Hi-Rel applications, they are a viable alternative to brushless vibration motors as the only internal parts that are subjected to wear / failure are the springs.

Advanced Rectangular LRA

 

NOTES:

• Custom wire length are available for MOQ: 2K pcs
• We can add connectors for MOQ: 2K pcs
• Custom FPC’s are available for MOQ: 5K pcs.
• Tooling and design fees will apply for custom FPC’s

Unlike conventional brush type DC vibration motors, linear resonant actuators must be driven by an AC signal at the LRA’s resonant frequency.  They can not be driven directly from a DC voltage source. The wire leads are typically different colors however the wires do not have polarity as the drive signal is AC , and not DC. 

A number of companies make Haptic IC drivers that are compatible with our  linear vibration motors.

Renesas (formerly Dialog Semiconductor) makes a full line of Haptic Drivers as well as an  evaluation board that incorporates their popular DA728x Series Haptic driver IC which may be purchased here.   Configuration files are available for our most popular  LRAs.  These files will aid engineers in quickly setting up the DA728x series for optimal performance.   

Texas Instruments makes the DRV26xxx series of Haptic Driver and supplies an evaluation board that incorporates the  TI DRV2605L haptic driver IC.  An alternate version that can drive up to 8 LRA’s is here.  

Haptic Labs also makes a unique “No Coding”  development toolkit that will aid engineers in developing haptic interactions.

Unlike brush type ERM vibration motors, changing the amplitude of the drive voltage will only change the amplitude of the G  force, not the frequency of vibration.   Because of the LRA’s narrow band width /  High-Q, applying a frequency above or below the resonant frequency of the LRA will result in the LRA producing a lower vibration amplitude or if far from the resonant frequency, none at all.   Please note we also offer wide band LRA’s as well as LRA’s that operate on multiple resonant frequencies.