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Pololu item #:
2294
Brand:
Sanyo Denki
This tiny bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution). Each phase draws 300 mA at 6.3 V, allowing for a holding torque of 66 g-cm (0.92 oz-in). With a weight of just 27 g, this is the smallest stepper motor we carry.
Alternatives available with variations in these parameter(s): shaft type Select variant…
Compare all products in Stepper Motors.
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Dimensions (in mm) of the Sanyo miniature (14×30mm) stepper motor. |
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Bipolar stepper motor wires are terminated with bare leads. |
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Sanyo bipolar stepper motor wiring diagram. |
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Sanyo stepper motors; from left to right: 14mm single shaft, 42×18.6mm, 50×11mm, 14mm double shaft |
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Bipolar stepper motor wires are terminated with bare leads. |
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Sanyo bipolar stepper motor wiring diagram. |
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This tiny bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution) and is available with a single shaft or double shaft. Each phase draws 300 mA at 6.3 V, allowing for a holding torque of 66 g-cm (0.92 oz-in). The motor has four color-coded wires terminated with bare leads: red and yellow connect to one coil; orange and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver or one of our Tic Stepper Motor Controllers. In particular, the Tics make control easy because they support six different interfaces (USB, TTL serial, I²C, RC, analog voltages, and quadrature encoder) and are configurable over USB with our free configuration utility.
Our 4 mm universal mounting hub can be used to mount objects on the stepper motor’s 4 mm-diameter output shaft.
More specifications are available in the datasheet (125k pdf).
The following diagram shows the stepper motor dimensions in mm. This motor is 30 mm in length. The output shaft has a length of 15 mm and a diameter of 4 mm. The second shaft on the dual version has a length of 10 mm and a diameter of 4 mm. This shaft works with our 4 mm universal mounting hub.
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The inside of a bipolar stepper motor (SOYO NEMA 14-size). |
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Stepper motors are generally used in a variety of applications where precise position control is desirable and the cost or complexity of a feedback control system is unwarranted. Here are a few applications where stepper motors are often found:
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Sanyo stepper motors; from left to right: 14mm single shaft, 42×18.6mm, 50×11mm, 14mm double shaft |
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Note: Sanyo Denki calls these products the “SANMOTION F2 Small Size 2-Phase Stepping Motor Models SH2141-5541 (or SH2141-5541P)” and “SH2141-5511 (or SH2141-5511P)”. The one ending in 5541/5541P is the part number for the single shaft version while the one ending in 5511/5511P is the part number for the double shaft version.
| Size: | 14 mm square × 30 mm1 |
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| Weight: | 27 g |
| Shaft diameter: | 4 mm |
| Shaft type: | Single shaft |
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| Current rating: | 300 mA2 |
| Voltage rating: | 6.3 V |
| Holding torque: | 0.92 oz·in |
| Steps per revolution: | 200 |
| Resistance: | 21 Ohm2 |
| Inductance per phase: | 4.2 mH |
| Number of leads: | 4 |
| Lead length: | 30 cm |
| Encoders?: | N |
Yes. To avoid damaging your stepper motor, you want to avoid exceeding the rated current, which is 600 mA in this instance. All of our stepper motor drivers let you limit the maximum current, so as long as you set the limit below the rated current, you will be within spec for your motor, even if the voltage exceeds the rated voltage. The voltage rating is just the voltage at which each coil draws the rated current, so the coils of your stepper motor will draw 600 mA at 3.9 V. By using a higher voltage along with active current limiting, the current is able to ramp up faster, which lets you achieve higher step rates than you could using the rated voltage.
If you do want to use a lower motor supply voltage for other reasons, consider using our DRV8834 or STSPIN-220 low-voltage stepper motor drivers.
The answer to this question depends on the type of stepper motor you have. When working with stepper motors, you will typically encounter two types: unipolar stepper motors and bipolar stepper motors. Unipolar motors have two windings per phase, allowing the magnetic field to be reversed without having to reverse the direction of current in a coil, which makes unipolar motors easier to control than bipolar stepper motors. The drawback is that only half of the phase is carrying current at any given time, which decreases the torque you can get out of the stepper motor. However, if you have the appropriate control circuitry, you can increase the stepper motor torque by using the unipolar stepper motor as a bipolar stepper motor (note: this is only possible with 6- or 8-lead unipolar stepper motors, not with 5-lead unipolar stepper motors). Unipolar stepper motors typically have five, six, or eight leads.
Bipolar steppers have a single coil per phase and require more complicated control circuitry (typically an H-bridge for each phase). The A4988 has the circuitry necessary to control a bipolar stepper motor. Bipolar stepper motors typically have four leads, two for each coil.
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Two-phase bipolar stepper motor with four leads. |
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The above diagram shows a standard bipolar stepper motor. To control this with the A4988, connect stepper leads A and C to board outputs 1A and 1B, respectively, and stepper leads B and D to board outputs 2A and 2B, respectively. Note that if you happen to swap which way the wires are connected for any coil, the stepper motor will turn in the opposite direction, and if you happen to pair up wires from different coils, the motor should be noticeably erratic when you try to step it, if it even moves at all. See the A4988 datasheet for more information.
If you have a six-lead unipolar stepper motor as shown in the diagram below:
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Two-phase unipolar stepper motor with six leads. |
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you can connect it to the A4988 as a bipolar stepper motor by making the bipolar connections described in the section above and leaving stepper leads A’ and B’ disconnected. These leads are center taps to the two coils and are not used for bipolar operation.
If you have an eight-lead unipolar stepper motor as shown in the diagram below:
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Two-phase unipolar stepper motor with eight leads. |
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you have several connection options. An eight-lead unipolar stepper motor has two coils per phase, and it gives you access to all of the coil leads (in a six-lead unipolar motor, lead A’ is internally connected to C’ and lead B’ is internally connected to D’). When operating this as a bipolar stepper, you have the option of using the two coils for each phase in parallel or in series. When using them in parallel, you decrease coil inductance, which can lead to increased performance if you have the ability to deliver more current. However, since the A4988 actively limits the output current per phase, you will only get half the phase current flowing through each of the two parallel coils. When using them in series, it’s like having a single coil per phase (like in four-lead bipolar steppers or six-lead unipolar steppers used as bipolar steppers). We recommend you use a series connection.
To connect the phase coils in parallel, connect stepper leads A and C’ to board output 1A, stepper leads A’ and C to board output 1B, stepper leads B and D’ to board output 2A, and stepper leads B’ and D to board output 2B.
To connect the phase coils in series, connect stepper lead A’ to C’ and stepper lead B’ to D’. Stepper leads A, C, B, and D should be connected to the stepper motor driver as normal for a bipolar stepper motor (see the bipolar stepper connections above).
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