Oriental Motor
Oriental Motor Vexta PK264-03B NEMA 23 Stepper Motor with 4GN25KA 25 to 1 Gearhead
- 9 photos
Never used. The original pack has been opened, or the quantity was split off a full reel or tube. Leads are original and unclipped.
New old stock, open stock on the grading scaleSend the quantity you need. You get a quote back with shipping before anything is charged.
Videos
Filmed on the bench. Sound is stripped from product clips.
- 0:07
Frame from the video clip panning across the gearhead with its carton in the background. No stepper in this frame.
- 0:09
Frame from the handling clip with the stepper still bagged. The gearhead is a separate item and is not in this frame.
Specifications
| Specification | Value |
|---|---|
| Identification | |
| Part number | PK264-03B |
| Manufacturer | Oriental Motor |
| Condition | New old stock, open stock |
| Date code | Not recorded |
| Package | NEMA 23 frame motor plus 80 mm frame gearhead |
| Country of origin | Not recorded |
| Family | Not recorded |
| Stock number | 9V4JS2MH |
| Motor | |
| Model | PK264-03B |
| Series | Vexta PK series, 2 phase stepping motor |
| Step angle | 1.8deg per step |
| Full steps per revolution | 200 |
| Shaft configuration | Double shaft (B suffix) |
| Frame size | 56.4 mm square, NEMA 23 |
| Body length | 39mm |
| Shaft diameter | 6.35 mm, 1/4 in |
| Mounting holes | 4 holes, 4.5 mm diameter, on a 47.14 mm square pattern |
| Rated current, unipolar | 3.0A per phase |
| Winding resistance, unipolar | 0.63ohm per phase |
| Holding torque, unipolar | 0.39 Nm, 54.1 oz-in |
| Rated current, bipolar series | 2.1A per phase |
| Holding torque, bipolar series | 0.48 Nm, 68 oz-in |
| Lead wires | 6, coloured black, green, red, blue, yellow, white |
| Insulation class | Class B, 130 C |
| Weight | 0.45kg |
| Nameplate rating confirmed | 2 phase, 1.8 degrees per step, DC 3 A |
| Nameplate code | 05494 |
| Non factory marking | A hand written white sticker on the stator reads 83.2. It is not printed and is not a rating. |
| Gearhead | |
| Model | 4GN25KA |
| Type | GN parallel shaft gearhead |
| Gear ratio | 25:1 |
| Gearhead frame size | 80 mm square |
| Output shaft diameter | 3/8 in. The KA suffix denotes an inch sized output shaft, the plain K suffix is the metric version |
| Gearhead length | 42.5 mm, 1.67 in |
| Maximum permissible torque, 4GN frame | 8 Nm, 69 lb-in |
| Mounting compatibility | Direct attachment to Oriental Motor 25 W class 80 mm frame AC motors fitted with a GN pinion shaft, for example 4IK25GN and 4RK25GN. It is NOT a factory mate for the 56.4 mm PK264 stepper. |
| Gearhead nameplate code | XV 00041 |
| Gearhead carton code | 008P17 |
| Gearhead packaging | Original Oriental Motor carton, opened |
About this part
The PK264-03B is a NEMA 23 two phase stepping motor from Oriental Motor's Vexta PK series: 56.4 mm square, 39 mm long, double shaft, six lead wires. The 03 suffix is the 3 A per phase winding, the lowest impedance of the three standard PK264 windings, which is what you want behind a modern constant current chopper running from a 24 to 48 V supply. Holding torque is 0.39 Nm wired unipolar and 0.48 Nm wired bipolar series. Six leads gives you the choice: unipolar with the centre taps commoned, bipolar series for torque at low speed, or bipolar half coil for speed.
The 4GN25KA sold alongside it is a separate item, a 25 to 1 parallel shaft GN gearhead in the 80 mm square frame with a 3/8 inch output shaft. GN gearheads bolt to Oriental Motor 25 W class AC motors that carry a GN pinion on the rotor shaft, such as the 4IK25GN and 4RK25GN. It is not a factory mate for a 56.4 mm stepper, so treat these as two separately usable parts rather than an assembly.
On old stock, turn the motor shaft by hand and feel for even detents, ring out all six leads for two matched pairs plus taps, check the shaft and pilot for damage, and turn the gearhead input to check for hardened grease and excess backlash.
Questions about this part
Does the 4GN25KA gearhead fit the PK264-03B motor?
No. The 4GN gearhead is built for Oriental Motor's 80 mm frame, 25 W class AC motors that carry a GN pinion on the rotor shaft. The PK264 is a 56.4 mm NEMA 23 stepper with a plain 6.35 mm shaft. They are two separate parts sold together, not a matched gearmotor.
What motors does the 4GN25KA actually fit?
Oriental Motor 25 W class induction, reversible and brake motors in the 80 mm frame with a GN pinion, for example the 4IK25GN and 4RK25GN families. The gearhead attaches directly, no coupling required.
What does the 03B in PK264-03B mean?
PK is the high torque 2 phase stepping motor type, 2 is the phase count, 6 is the 56.4 mm frame, 4 is the case length, 03 is the rated current per phase code, 3 A, and B is double shaft. The single shaft equivalent is PK264-03A.
Can I drive it bipolar?
Yes. It has six leads, so ignore the two centre taps and drive the four outer leads. Bipolar series gives 0.48 Nm holding torque at 2.1 A per phase, trading top speed for low speed torque against half coil wiring.
Which lead colour goes where?
The six leads are black, green, red, blue, yellow and white. In the standard unipolar hookup black and green are the two ends of one phase, red and blue the other, and yellow and white are the centre taps. Confirm with a meter before wiring.
What driver do I need?
Any constant current bipolar chopper driver sized for at least 2.1 A per phase, or a unipolar driver at 3 A per phase. The 1.9 V unipolar rating is the winding voltage at rated current, not the supply voltage.
What output speed does 25 to 1 give?
Divide the input speed by 25. On a 4 pole 60 Hz induction motor at a synchronous 1800 r/min that is 72 r/min nominal, with the real figure typically 2 to 20 percent lower under load.
What should I check on an old gearhead?
Turn the input pinion and feel for even resistance with no notching, check for grease that has separated or hardened, look for weeping at the output shaft seal, and measure backlash at the output before committing it to a positioning job.