Rotary Servomotors

Yaskawa was the first company to mass produce servomotors employing a segmented stator design. This process uses individually wound stator segments that are grouped together, press fit into the motor body, and impregnated with resin. The result is improved heat transfer, dramatic reduction in motor size and cost, and the best quality and reliability available. Yaskawa has leveraged this technology to become the largest servomotor manufacturer in the world and produced the 5,000,000th AC servomotor in 2006.

The Sigma family of servomotors has taken the next technological step using high-resolution serial encoder feedback. Position information is transmitted to the amplifier allowing full error checking which eliminates position error caused by electrical noise and prevents runaway conditions. This all-digital feedback design enables the amplifier to automatically recognize the motor and optimize settings.

Comparison of Rotary Servomotors

Motor Parameters | Amplifier Voltage | Encoder Options | Miscellaneous Options | Amplifier

Motor Parameters		Sigma-5 Series		Sigma II Series						Direct Drive	Mini
Motor Parameters		SGMJV	SGMAV	SGMAH	SGMPH	SGMGH	SGMSH	SGMUH	SGMBH	SGMCS	SGMM
Sizes Within Series		5	7	6	5	10	6	2	5	17	2
Rated Torque	lb-in [N-m]	21 [2.39]	21 [2.39]	21 [2.39]	42 [4.77]	845 [95]	140 [15.8]	43 [4.9]	3100 [350]	1770 [200]	0.56 [0.064]
Peak Torque	lb-in [N-m]	74 [8.36]	63 [7.1]	63 [7.1]	126 [14.3]	1988 [224]	422 [47.6]	190 [21.5]	6120 [700]	5310 [600]	1.68 [0.19]
Rated Speed	[rpm]	3000	3000	3000	3000	1500	3000	6000	1500	150-200	3000
Max Speed	[rpm]	6000	6000	5000	5000	3000 (1)	5000	6000	2000	250-500	5000
Power Range	[kW]	0.75	0.75	0.75	1.5	15	5	3	55	3	0.2
IP Rating (excluding shaft)		IP65	IP65	IP55	IP67	IP67	IP67	IP67	IP44 (2)	IP42	IP55
Inertia		Medium	Low	Low	Medium	Medium	Low	Low	High	High	Low
Flange Size	in [mm]	1.57-3.15 [40-80]	1.57-3.15 [40-80]	1.57-3.35 [40-85}	2.36-4.72 [60-120]	5.12-8.66 [130-220]	3.94-5.12 [100-130]	4.57-6.10 [116-155]	9.84-11.8 (3) [250-300]	5.31-14.17 (4) [135-360]	0.98 [25]
Notes: (1) 11kW and 15kW models have 2000 rpm max speed. (2) Includes shaft. (3) Largest size (55kW) is foot-mounted. (4) SGMCS dimension is overall motor diameter in millimeters.
Back to Top
Amplifier Voltage		Sigma-5 Series		Sigma II Series						Direct Drive	Mini
Amplifier Voltage		SGMJV	SGMAV	SGMAH	SGMPH	SGMGH	SGMSH	SGMUH	SGMBH	SGMCS	SGMM
24VDC											■
100VAC, 1-phase				□	□
200VAC, 1-phase		■	■	■	■	□	□
200VAC, 3-phase		■	■	□	□	■	■			■
480VAC, 3-phase						■	■	■	■
Symbol Key: ■ Applies to entire product line □ Applies to only part of the product line.
Back to Top
Encoder Options		Sigma-5 Series		Sigma II Series						Direct Drive	Mini
Encoder Options		SGMJV	SGMAV	SGMAH	SGMPH	SGMGH	SGMSH	SGMUH	SGMBH	SGMCS	SGMM
Incremental	ppr⁵	1048576	1048576	8192	8192	131072	131072	131072	131072		8192
Absolute	ppr⁵	1048576	1048576	65536	65536	131072	131072	131072	131072	1048576
Notes: (5) ppr is the resolution in pulses per revolution as seen by the controller (post quadrature).
Back to Top
Misc. Options		Sigma-5 Series		Sigma II Series						Direct Drive	Mini
Misc. Options		SGMJV	SGMAV	SGMAH	SGMPH	SGMGH	SGMSH	SGMUH	SGMBH	SGMCS	SGMM
Holding Brake Available		■	■	■	■	■	■	■	■		■
Shaft Seal Available		■	■	■	■	■	■	■	■
Gearbox Available						■	■
NEMA Flange Available					□
Symbol Key: ■ Applies to entire product line □ Applies to only part of the product line.
Back to Top
Amplifier		Sigma-5 Series		Sigma II Series						Direct Drive	Mini
Amplifier		SGMJV	SGMAV	SGMAH	SGMPH	SGMGH	SGMSH	SGMUH	SGMBH	SGMCS	SGMM
SGDV Sigma-5		■	■
SGDH Sigma II				■	■	■	■	■	■	■
SGDG LEGEND				■	■	□	□
SGDF Sigma Mini											■
Symbol Key: ■ Applies to entire product line □ Applies to only part of the product line.
Back to Top

Comparison of Rotary Servomotors

News