Generally, stepper motor linear actuators are available for standard stepper motor sizes (NEMA 11, 14, 17, and 23 motor frame sizes), single or double stacked, with a variety of motor winding options and linear resolution options ranging from 0.063 to 7.5 μin of linear travel per step. Available offerings may differ in their ability to handle radial and moment loads, capability to integrate other devices, visibility of rotating parts, mounting options, and customization capability, so it is wise to consider your needs in these areas before purchasing one.
Radial and moment load handling. Although most related applications involve axial loads, a properly fitted system should be able to achieve radial or moment loads of five to ten percent of the axial load. If your application requires radial and moment load handling, look for actuators with integrated bushings or other features that provide this ability for “side load.”
Integrating external devices. There is certainly a trend toward integrating multiple devices to improve control and reduce maintenance costs. It may, for example, be desirable to attach linear encoders to the back of the stepper motor. To keep this option open, avoid assemblies in which the screw extends out the back of the motor.
Mounting. If you are replacing existing motors, you can save yourself some trouble by purchasing a motor with NEMA-standard bolt-hole patterns. Hole positions can always be customized but starting with the NEMA standard will save you trouble on initial purchase and into the future.
Customization. In addition to bolt-hole pattern customization, customization options include end machining, wiring, cabling, and connectors.
If you have skilled resources in-house, building your own anti-rotational guidance for your integrated motorized lead screw linear stepper motor might have some short-term cost advantages; however, purchasing an integrated stepper motor linear actuator will get you into production faster and provide more accurate and reliable motion, while reducing longer-term maintenance and total cost of ownership.
ステッピングモータ制御
ステッピングモータ制御は通常、 双方向駆動電流を採用し巻線を順に切り替えることでモータをステッピング（ステップ角度ごとに回転）させます。駆動順は3つあります。
- 一相オン・フルステップ駆動：この制御モードでは巻線がAB、CD、BA、DCの順に励磁します（BAとは巻線ABを逆方向に励磁することを意味します）。 この順は「一相オン」フルステップ又は波駆動モードと呼ばれます。任意の時点で一相のみが励磁されています。
- 二相オン・フルステップ駆動：このモードでは二相を同時に励磁するので、ロータは常に2つの極位置の間に整列します。 「二相オン」フルステップと呼ばれます。このモードはバイポーラモータの標準駆動順であり、最大のトルクを産出します。
- 半ステップモード：この方法は「一相オン」モードと「二相オン」モードの組み合わせで、
一相励磁⇒二相励磁⇒一相励磁⇒…となります。 モータは半ステップごとに回転します。この順は半ステップモードと呼ばれます。モータの励磁に対しての有効ステップ角度は半分になりますが、より小さいトルクを産出します。
上記3モードをどれも逆方向の回転（逆時計回り）に使えます。駆動順だけを逆にします。
ステッピングモータは通常、ステップ角度を少数に抑えるために複数の極を設置しますが、巻線の数と駆動順は変わりません。
Official Software download website: www.dbscar.com
Launch Creader 7S Function:
Read dynamic datastream
MIL indicator
Readiness status test
Search freeze frame data
Read current DTCs
Clear DTCs
O2 sensor detection test
Specified monitoring system on-board monitor test
Read pending DTCs
Read on-board systems or components control
Read vehicle information
Read permanent DTCs
DTCs search
Tested data playback
Cresetter (oil , EPB and BAT )