Emerson E171230, N1652 manual Selecting the Right Motor for the Right Drive, Electronic Nameplates

Selecting the Right Motor for the Right Drive

Control Techniques drive-and-motor combinations provide an optimized system in terms of ratings, performance, cost and ease of use. Use Control Techniques’ FREE CTSelect software to select system components or manually select the system using the following steps.

1.Determine the application’s continuous and peak torque requirements at various motor shaft speeds, then refer to motor data tables and the visual-reference overview on the facing page to help determine which motor family will be most appropriate for the application.

2.Once the motor family is selected, refer to the Control Techniques Servo Motors brochure to select a specific motor that delivers the required torque and speed. Make note of the continuous and peak current (Amps) requirements of the selected motor.

3.Check the ratings tables on page 19 of this brochure to select the drive model that delivers adequate continuous and peak current for the selected motor.

4.Go to the Control Techniques Servo Motors brochure to select motor power and feedback cables for the selected drive/motor combination.

Check that the rotor inertia of the selected motor has a ratio of <10 when calculated with the load inertia using the following equation:

Load inertia / rotor inertia

Note: A gear reducer will reduce the load inertia based on the following equation:

Reflected load inertia = load inertia / (gear ratio) 2

When specifying a motor system, be sure to consider such factors as user-interface (HMI) options, braking resistors and other options and accessories that will enhance the system’s performance and value (see Options & Accessories brochure for information and order codes).

Electronic Nameplates

Some motors fitted with high-resolution SinCos or absolute encoders are pre-loaded with the motor “electronic nameplate” data during the manufacturing process. This data can be read by Control Techniques’ Servo drives and used to automatically optimize the drive settings. This feature simplifies commissioning and maintenance, ensures consistent performance and saves time.

Example (using Control Techniques’ NT Motor family and Unidrive SP Servo drive family):

Step 1: The application requires 10 lb-in continuous torque. The input voltage available is 230Vac.

Step 3: Select the Unidrive SP drive with adequate current rating.

Frame		NT Torque Range
Size
NT-207	7.5	21288.5
NT-212	12.5	37.5
NT-320	20		596
1		10	100
	Continuous Stall (lb-in)		Peak (lb-in)

SizeFrame

0

	200-240Vac	Normal Duty
+/- 10% 3Ø
	(kW@220V,	Max	Motor	Typical
	hp@230V)	Continuous	Power	Output
	Order Code	Current (A)	(hp)	(kW)
	SP0201		0.5	0.37
		2.2
	SP0202	3.1	0.75	0.55
	SP0203	4	1	0.75
	SP0204	5.7	1.5	1.1
	SP0205	7.5	2	1.5

Heavy Duty

Max	Motor	Typical
Continuous	Power	Output
Current (A)	(hp)	(kW)
2.2	0.5	0.37
3.1	0.75	0.55
4	1	0.75
5.7	1.5	1.1
7.5	2	1.5

Step 2: The Control Techniques Servo Motors brochure lists									Step 4: Select the appropriate power and feedback cables.
the NT-212 motor with 2.7A continuous torque and 6A peak.
	NT Motor Specifications
				Cont.				Max
			Rated	Stall	Peak	Motor	Motor	Operating		Inertia			Motor Kt	Motor
			Torque	Current	Current	Resistance Inductance		Speed		lb-in-sec2	Motor Ke	lb-in/Arms		Weight
	Motor Model	lb-in (Nm)		Arms	Arms	Ohms	mH	rpm		(kgm2)	Vrms/krpm	(Nm/Arms)		lb (kg)
	NT-207		7.5 (.85)	1.7	3.6	11.1	39.1	5000		0.000094 (.106)	35		5.12 (.58)	3 (1.36)
	NT-212		12.5 (1.4)	2.7	6	4.56	18.9	5000		0.000164 (.000018)	35		5.12 (.58)	4 (1.82)
	NT-320		20 (2.2)	5.4	16.2	1.5	16.0	4000		0.000328 (.37)	29		3.50 (.40)	6 (2.72)
	NT-320		18.0 (2.0)	5.4	16.2	1.5	16.0	4000		0.000558 (.63)	29		3.50 (.40)	6.9 (3.13)
	medium inertia
	ForNTcomplete-320		information32 (3.6) 6.25on		Control18.38	Techniques’1.2	Servo15.0 motor4000offering,0.refer000438to(.494)brochure number36						4BRO.73 (.53)-SRVOMTRS7.3 (3.31)-		1107.

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