Pacific Scientific POWERMAX II stepper motor

Subsequent characters (rotor type, winding, etc.): N=standard rotor (L-type), R=specific winding code, X=option to be defined, S=shaft type, etc.

Conclusion: LNN-NS-00 may indicate standard lead, no encoder, standard shaft, etc.

The document lists various winding options, represented by letters A to G for different rated current and resistance combinations. For the P2H half stack series, the following typical windings are provided:

5.2 A/0.22 Ω → Maintain torque at 59 oz in

2.6 A/0.90 Ω → Maintain torque at 59 oz in

3.68 A/0.44 Ω → Maintain torque 42 oz in

2.6 A/0.76 Ω → Maintain torque at 59 oz in

1.3 A/3.04 Ω → Maintain torque at 59 oz in

1.84 A/1.52 Ω → Maintain torque 42 oz in

2.5 A/0.84 Ω → Maintain torque 61 oz in

1.25 A/3.36 Ω → Maintain torque 61 oz in

1.77 A/1.68 Ω → Maintain torque of 43 oz in

1.61 A/1.92 Ω → Maintain torque of 60 oz in

0.80 A/7.68 Ω → Maintain torque of 60 oz in

1.10 A/3.84 Ω → Maintain torque 42 oz in

Users can choose the appropriate winding based on the output current capability and required torque speed characteristics of the driver. All rated parameters were measured at 25 ° C.

Detailed technical specifications

5.1 Basic Electrical and Mechanical Parameters

Number of phases: 2 phases

Step angle: 1.8 ° (full step), 200 full steps per revolution

Step accuracy:

M series (including M-J low inertia): ± 1.5% per step (no load, non cumulative)

P series (including P-J low inertia): ± 3% per step (no load, non cumulative)

Insulation Class: NEMA Class B (130 ° C)

Insulation resistance: 100 M Ω @ 500 Vdc, 25 ° C

Working environment temperature: -20 ° C to 40 ° C

Storage temperature: not specified, but usually within the same working range.

5.2 Axle Load Capacity

Maximum radial load: 20 lb (approximately 89 N), acting on the midpoint of the standard shaft extension.

Maximum axial load: 13 lb (approximately 58 N), oriented towards the motor (push in).

Bearing lifespan: POWERMAX II uses oversized 30mm bearings (ordinary NEMA 23 motors typically use 22mm or smaller bearings). The fatigue life of bearings (L ₁₀) exceeds 10000 hours under the conditions of meeting radial and axial load limits and a speed not exceeding 10000 full steps per second. Compared to similar motors using 22mm bearings, the lifespan is approximately four times longer.

5.3 Thermal performance

Thermal resistance: measured when there is no heat sink installed in still air. The specific values vary depending on the model (not directly provided in the document table, but mentioned as' Thermal resistance measured with motor hanging in still air ').

Temperature rise: At rated current, the winding temperature can reach 130 ° C (B-level insulation limit). When the ambient temperature is 40 ° C, the surface temperature of the motor may be high, and good ventilation should be ensured during application.

5.4 Inductance and Resistance

The phase inductance is given in the form of a small signal inductance and measured using an impedance bridge at 1 kHz and 1 A. The typical range of inductance values for different windings is from approximately 0.45 mH to 20.4 mH. Low inductance windings are suitable for applications that require high-speed response, but require drivers to provide a higher current rise rate; High inductance windings provide smoother torque at low speeds, but require higher driving voltage.

Size and Installation

The installation flange of POWERMAX II NEMA 23 motor complies with NEMA standards, with a positioning stop diameter of 2.3 inches (58.4 mm) and a bolt hole center to center distance of 1.856 inches (47.14 mm) (typically 2.625 inches spacing). The length of the motor varies depending on the stack length and rotor type:

Half stack model (P2H): approximately 1.60 inches (40.6 mm) in length

Single stack model (P21/M21): Approximately 2.06 inches (52.3 mm) in length

Double stack model (P22/M22): Approximately 2.4 inches (61.0 mm) or 3.10 inches (78.8 mm) in length (depending on rotor type).

The standard diameter of the motor output shaft is 0.250 inches (6.35 mm) with a flat surface. We can customize shaft extension length, dual axis extension, screw integrated shaft, etc. as needed.

Wiring and connector options

POWERMAX II motors offer multiple lead out methods:

Flying Leads: Standard configuration includes 8 or 4 26 AWG PTFE insulated wires, with color coding in accordance with industry conventions (phase A: black/orange; B phase: red/yellow; Center tap: white/red, white/yellow, etc. Users can choose between bipolar series, bipolar parallel, or unipolar connections based on the type of driver.

Optional connector kit: Pacific Scientific offers cable assemblies with pre installed connectors for the GW series, such as GW0000F (8-wire) and GW0000H/L (4-wire). These connectors are easy to plug and unplug quickly, reducing wiring errors. The correspondence between connector pin definitions and wire colors is detailed in the document.

Phase sequence: Observing from the motor installation end (i.e. flange end), the motor shaft can rotate clockwise or counterclockwise according to a specific power sequence (e.g. A+, B+, A -, B -). The specific phase sequence diagram can be found on pages 9-10 of the document.