Brushless Motors

EC121A 121mm Brushless DC Motor

The EC121A series brushless motor is a high torque model brushless motor designed in a NEMA 48 package. It is offered in 4 motor lengths with continuous torque from 3.0 - 6.5 Nm.

Features:

Speeds up to 4,000 RPM
DC bus voltage up to 325 Vdc
NEMA 48 package
Capable of 48V Vdc bus systems
8 Pole neodymium design

Videos:
NEW! Pittman Express Motor Calculator Tutorial
How Motor Curves are Created and How to Use Them

Specifications +

MOTOR DATA	Units	EC121A-1	EC121A-2	EC121A-3	EC121A-4
Max DC Terminal Voltage	V	325	325	325	325
Max Speed (Mechanical)	rpm	4000	4000	4000	4000
Continuous Stall Torque	Nm	3.0	3.9	4.5	6.6
Continuous Stall Torque	oz-in	430	550	630	930
Peak Torque (Maximum)	Nm	9.4	12	14	20
Peak Torque (Maximum)	oz-in	1300	1700	2000	2800
Rotor Inertia	kg m2	0.00079	0.0012	0.0017	0.0021
Rotor Inertia	oz-in-s2	0.11	0.18	0.24	0.30
Motor Weight	g	7100	9900	12000	15000
Motor Weight	oz	250	350	440	530

Dimensional Drawings +

Performance Curves +

EC121A-1 Speed Torque Performance Curve

S.O.A.C. = Safe Operating Area for Continuous duty

EC121A-2 Speed Torque Performance Curve

S.O.A.C. = Safe Operating Area for Continuous duty

EC121A-3 Speed Torque Performance Curve

S.O.A.C. = Safe Operating Area for Continuous duty

EC121A-4 Speed Torque Performance Curve

S.O.A.C. = Safe Operating Area for Continuous duty

NOTE: All values specified at 25°C ambient temperature. Peak values are theoretical and for reference only.

Winding Performance Data +

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EC121A-1	Units
Rated Voltage	V	60.0	76.0	76.0	121	152	152	305
Rated Torque	Nm	2.2	2.3	2.4	2.3	2.3	2.3	2.3
Rated Torque	oz-in	320	320	330	330	330	330	320
Rated Speed	rpm	4000	4000	4000	4000	4000	4000	4000
Rated Current	A	28	25	21	18	14	11	8.5
Rated Power	W	930	950	990	960	970	960	960
No Load Speed	rpm	4000	4000	4000	4000	4000	4000	4000
No Load Current	A	1.2	1.0	0.82	0.70	0.57	0.45	0.34
Torque Constant	Nm/A	0.0936	0.105	0.129	0.152	0.187	0.234	0.315
Torque Constant	oz-in/A	13.3	14.9	18.3	21.5	26.5	33.1	44.6
Voltage Constant	V/krpm	9.80	11.0	13.5	15.9	19.6	24.5	33.0
Terminal Resistance	Ω	0.0500	0.0700	0.100	0.140	0.220	0.340	0.610
Inductance	mH	0.27	0.34	0.51	0.72	1.09	1.70	3.10
Peak Current	A	110	99	84	69	57	45	33

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EC121A-2	Units
Rated Voltage	V	76.0	76.0	152	152	305	305
Rated Torque	Nm	2.1	2.3	2.3	2.3	2.3	2.4
Rated Torque	oz-in	300	320	330	330	320	330
Rated Speed	rpm	4000	4000	4000	4000	4000	4000
Rated Current	A	19	18	14	11	7.3	5.3
Rated Power	W	880	950	980	970	960	990
No Load Speed	rpm	4000	4000	4000	4000	4000	4000
No Load Current	A	1.2	1.1	0.73	0.62	0.41	0.29
Torque Constant	Nm/A	0.131	0.150	0.206	0.244	0.374	0.524
Torque Constant	oz-in/A	18.6	21.2	29.2	34.5	53.0	74.2
Voltage Constant	V/krpm	13.7	15.7	21.6	25.5	39.2	54.9
Terminal Resistance	Ω	0.0700	0.0800	0.150	0.210	0.510	0.950
Inductance	mH	0.32	0.42	0.80	1.13	2.67	5.24
Peak Current	A	96	90	66	57	36	26

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EC121A-3	Units
Rated Voltage	V	76.0	152	152	305	305	305
Rated Torque	Nm	2.4	2.7	2.7	2.6	2.6	2.7
Rated Torque	oz-in	340	380	390	370	380	390
Rated Speed	rpm	4000	4000	4000	4000	4000	4000
Rated Current	A	16	15	11	9.4	7.6	5.6
Rated Power	W	1000	1100	1100	1100	1100	1100
No Load Speed	rpm	4000	4000	4000	4000	4000	4000
No Load Current	A	0.79	0.69	0.51	0.44	0.35	0.25
Torque Constant	Nm/A	0.181	0.207	0.285	0.330	0.413	0.573
Torque Constant	oz-in/A	25.6	29.3	40.3	46.8	58.6	81.1
Voltage Constant	V/krpm	19.0	21.7	29.8	34.6	43.3	60.0
Terminal Resistance	Ω	0.0900	0.110	0.200	0.280	0.430	0.790
Inductance	mH	0.46	0.60	1.14	1.13	2.42	4.58
Peak Current	A	81	75	57	48	39	28

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EC121A-4	Units
Rated Voltage	V	152	305	305
Rated Torque	Nm	4.7	4.7	4.7
Rated Torque	oz-in	660	660	660
Rated Speed	rpm	4000	4000	4000
Rated Current	A	24	15	12
Rated Power	W	2000	2000	2000
No Load Speed	rpm	4000	4000	4000
No Load Current	A	1.1	0.65	0.53
Torque Constant	Nm/A	0.224	0.365	0.449
Torque Constant	oz-in/A	31.8	51.7	63.6
Voltage Constant	V/krpm	23.5	38.2	47.0
Terminal Resistance	Ω	0.130	0.340	0.520
Inductance	mH	0.93	1.60	3.72
Peak Current	A	100	63	51

Wiring Diagram +

Motor Leads (12 AWG)

Pin	Color	Signal
1	Red	Phase R
2	White	Phase S
3	Black	Phase T
4	Bare	Case Ground

Hall Sensor Leads (26 AWG)

Pin	Color	Signal
1	Red	Hall +5-15VDC
2	Black	Hall GND
3	Brown	Hall A
4	Orange	Hall B
5	Yellow	Hall C
6	Bare	Shield

Note: EC121A may be equipped with a C-Series Commutation Encoder. See Encoder section for wire color and signal designations.

Encoders +

C Encoder
The C & D high performance incremental encoders are transmissive devices with motor commutation outputs, integrated bearing and isolating spring mount. These encoders are identical to the Q and V encoders except for the additional motor commutation signals.

Features:

U V W motor phase commutation signals
Resolutions from 1000 to 5000
Differential line driver is standard
Frequency response to 500 kHz
Rugged mechanical design
Good for higher temperature
Shielded cable

Specifications

ENCODER DATA	SYMBOL	UNITS	C1, C3, C5, C8
Available Resolutions	-	-	1000, 2000, 2500, 5000
Output	-	-	2-Channel Quadrature with Index
Output Interface	-	-	TTL Compatible
Differential Line Driver			Yes
Commutation Poles			4 pole
Supply Voltage	V_cc	VDC	4.75 to 5.25
Supply Current	I_cc	mA	125 max
Max. Operating Frequency	f_max	kHz	500
Operating Temperature	θ_max	°C	-20 to +100

ENCODER DATA	SYMBOL	UNITS	CA, CC, CE, CH
Available Resolutions	-	-	1000, 2000, 2500, 5000
Output	-	-	2-Channel Quadrature with Index
Output Interface	-	-	TTL Compatible
Differential Line Driver			Yes
Commutation Poles			8 pole
Supply Voltage	V_cc	VDC	4.75 to 5.25
Supply Current	I_cc	mA	200 max
Max. Operating Frequency	f_max	kHz	500
Operating Temperature	θ_max	°C	-20 to +100

Dimensional Drawings

Connection Chart

COLOR	C models
Red	V_cc
Black	Encoder Ground
Brown	Channel A
White	Channel A̅
Blue	Channel B
Green	Channel B̅
Orange	Index I
Yellow	Index I̅
Violet	Output U
Gray	Output U̅
White / Brown	Output V
White / Red	Output V̅
White / Orange	Output W
White / Yellow	Output W̅
Black / White	Case Ground
Drain Wire	Cable Shield

Recommended Encoder Data Sheets
C Encoder Data Sheet pdf

Drives +

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Brushless Motors

EC121A 121mm Brushless DC Motor

Specifications +

Dimensional Drawings +

Performance Curves +

Winding Performance Data +

Wiring Diagram +

Encoders +

Drives +