{"product_id":"chs-gm12-15by-stepper-gear-motor","title":"CHIHAI CHS-GM12-15BY Stepper Gear Motor, 10\/30 Ohm Coil Options","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eCHIHAI CHS-GM12-15BY is a Ø15 mm two-phase stepper with an all-metal reduction gearbox, made for mechanisms that need a small, repeatable step rather than continuous spin: focus drives, micro gimbals, robot arms and smart furniture latches. An 18° input step is divided down by the gearbox, so the 1:380 version moves about 0.047° per step and holds its position with power on.\u003c\/p\u003e\n\u003cp\u003eNine ratios are offered from 1:10 to 1:380, in two coil resistances, with or without a driver board.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-phase 4-wire brushless stepper.\u003c\/strong\u003e No brushes to wear out, and position is set by step count rather than feedback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18° input step.\u003c\/strong\u003e Divided by the gearbox down to 0.047° at 1:380, giving fine positioning without a closed loop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-metal reduction gearbox.\u003c\/strong\u003e Metal gear train for wear resistance and a longer service life under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo coil resistances.\u003c\/strong\u003e 10 Ω for lower-voltage or higher-current drives, 30 Ω for the standard 5-12 V drive range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-4Y connector, 150 mm leads.\u003c\/strong\u003e Plugs straight into common stepper driver boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprox. 13 g.\u003c\/strong\u003e Light enough to mount on a moving head without rebalancing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eConfiguration Guide\u003c\/h2\u003e\n\u003ch3\u003eCoil resistance\u003c\/h3\u003e\n\u003cp\u003eTwo windings are sold. The \u003cstrong\u003e30 Ω\u003c\/strong\u003e version is the one the published charts are measured on and is the default choice for a 5-12 V driver. The \u003cstrong\u003e10 Ω\u003c\/strong\u003e version draws more current at the same voltage, which suits drivers that can supply it and gives more torque margin at low speed.\u003c\/p\u003e\n\u003ch3\u003eRatio\u003c\/h3\u003e\n\u003cp\u003e1:10 is the coarse, quick end (1.86° per step, 300 rpm at 1000 pps) and 1:380 the fine end (0.047° per step, 8 rpm). Holding torque rises with ratio from 0.14 to 2.90 kgf·cm. Pick by the resolution and speed your mechanism needs, then check the holding torque against the load.\u003c\/p\u003e\n\u003ch3\u003eDriver board\u003c\/h3\u003e\n\u003cp\u003eThe motor alone is a bare 4-wire stepper and needs an external driver. The two driver packages add a board (with or without its enclosure) for buyers who do not already have one.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eCHS-GM12-15BY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003e\u003ca class=\"tophitek-context-link\" href=\"https:\/\/rcdrone.top\/collections\/chihai-motor\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eCHIHAI MOTOR\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMotor type\u003c\/th\u003e\n\u003ctd\u003e2-phase 4-wire brushless stepper with all-metal reduction gearbox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStep angle (input)\u003c\/th\u003e\n\u003ctd\u003e18°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter dimensions\u003c\/th\u003e\n\u003ctd\u003eØ15 × 20 mm, excluding shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput shaft\u003c\/th\u003e\n\u003ctd\u003eØ3 mm D-cut, 8.5 mm long\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupply voltage\u003c\/th\u003e\n\u003ctd\u003eDC 5–12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoil resistance\u003c\/th\u003e\n\u003ctd\u003e10 Ω or 30 Ω per phase (±7%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase current\u003c\/th\u003e\n\u003ctd\u003e150 mA per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePhase inductance\u003c\/th\u003e\n\u003ctd\u003e9.5 mH per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHolding torque\u003c\/th\u003e\n\u003ctd\u003e0.14–2.90 kgf·cm by ratio; 3.0 kgf·cm max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax self-start rate\u003c\/th\u003e\n\u003ctd\u003emore than 1200 PPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax response rate\u003c\/th\u003e\n\u003ctd\u003emore than 900 PPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003e1.25-4Y, leads 150 ± 5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eapprox. 13 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePerformance by Ratio\u003c\/h2\u003e\n\u003cp\u003eMeasured at DC 5.0 V with a 30 Ω winding and an L6219 driver, 2-2 phase excitation. Torque is in kgf·cm.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003e1:10\u003c\/th\u003e\n\u003cth\u003e1:20\u003c\/th\u003e\n\u003cth\u003e1:30\u003c\/th\u003e\n\u003cth\u003e1:50\u003c\/th\u003e\n\u003cth\u003e1:100\u003c\/th\u003e\n\u003cth\u003e1:150\u003c\/th\u003e\n\u003cth\u003e1:210\u003c\/th\u003e\n\u003cth\u003e1:298\u003c\/th\u003e\n\u003cth\u003e1:380\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eExact ratio\u003c\/th\u003e\n\u003ctd\u003e9.68\u003c\/td\u003e\n\u003ctd\u003e19.36\u003c\/td\u003e\n\u003ctd\u003e29.47\u003c\/td\u003e\n\u003ctd\u003e51.1\u003c\/td\u003e\n\u003ctd\u003e99.3\u003c\/td\u003e\n\u003ctd\u003e150.96\u003c\/td\u003e\n\u003ctd\u003e209.76\u003c\/td\u003e\n\u003ctd\u003e297.9\u003c\/td\u003e\n\u003ctd\u003e379.16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput step angle\u003c\/th\u003e\n\u003ctd\u003e1.86°\u003c\/td\u003e\n\u003ctd\u003e0.93°\u003c\/td\u003e\n\u003ctd\u003e0.61°\u003c\/td\u003e\n\u003ctd\u003e0.35°\u003c\/td\u003e\n\u003ctd\u003e0.18°\u003c\/td\u003e\n\u003ctd\u003e0.12°\u003c\/td\u003e\n\u003ctd\u003e0.086°\u003c\/td\u003e\n\u003ctd\u003e0.06°\u003c\/td\u003e\n\u003ctd\u003e0.047°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed at 1000 pps\u003c\/th\u003e\n\u003ctd\u003e300 rpm\u003c\/td\u003e\n\u003ctd\u003e200 rpm\u003c\/td\u003e\n\u003ctd\u003e100 rpm\u003c\/td\u003e\n\u003ctd\u003e60 rpm\u003c\/td\u003e\n\u003ctd\u003e30 rpm\u003c\/td\u003e\n\u003ctd\u003e20 rpm\u003c\/td\u003e\n\u003ctd\u003e14 rpm\u003c\/td\u003e\n\u003ctd\u003e10 rpm\u003c\/td\u003e\n\u003ctd\u003e8 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHolding torque\u003c\/th\u003e\n\u003ctd\u003e0.14 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.28 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.42 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.70 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e1.40 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e2.10 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e2.90 kgf·cm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e3.0 kgf·cm max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePull-out torque\u003c\/th\u003e\n\u003ctd\u003e0.04 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.08 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.12 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.20 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.40 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.60 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e0.84 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e1.20 kgf·cm\u003c\/td\u003e\n\u003ctd\u003e1.50 kgf·cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eRecommended Drive Settings\u003c\/h2\u003e\n\u003cp\u003eDrive current scales with supply voltage: higher voltage reaches the same speed at lower current. These are the manufacturer's recommended settings for the 30 Ω winding.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eTest voltage\u003c\/th\u003e\n\u003cth\u003eRecommended drive frequency\u003c\/th\u003e\n\u003cth\u003eSuggested drive current\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC 12.0 V\u003c\/td\u003e\n\u003ctd\u003e1000\u003c\/td\u003e\n\u003ctd\u003e≤0.25 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC 7.40 V\u003c\/td\u003e\n\u003ctd\u003e1000\u003c\/td\u003e\n\u003ctd\u003e≤0.15 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC 6.00 V\u003c\/td\u003e\n\u003ctd\u003e1000\u003c\/td\u003e\n\u003ctd\u003e≤0.10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC 5.00 V\u003c\/td\u003e\n\u003ctd\u003e1000\u003c\/td\u003e\n\u003ctd\u003e≤0.08 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC 3.70 V\u003c\/td\u003e\n\u003ctd\u003e700\u003c\/td\u003e\n\u003ctd\u003e≤0.07 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eFor long continuous runs, watch the motor temperature and add dwell time or external cooling if it climbs.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWiring\u003c\/h2\u003e\n\u003cp\u003eFour leads on a 1.25-4Y connector, about 150 mm long: \u003cstrong\u003e1 white = A+\u003c\/strong\u003e, \u003cstrong\u003e2 black = B−\u003c\/strong\u003e, \u003cstrong\u003e3 red = A−\u003c\/strong\u003e, \u003cstrong\u003e4 yellow = B+\u003c\/strong\u003e. Direction is quoted looking at the output shaft end; swapping one phase pair reverses rotation. The wiring chart in Visual Details shows the full 2-2 excitation sequence.\u003c\/p\u003e\n\u003ch2\u003eMechanical Dimensions\u003c\/h2\u003e\n\u003cp\u003eBody \u003cstrong\u003eØ15 × 20 mm\u003c\/strong\u003e excluding the shaft, overall \u003cstrong\u003e22.5 mm max\u003c\/strong\u003e. Output shaft \u003cstrong\u003eØ3 mm D-cut, 8.5 mm long\u003c\/strong\u003e, with a \u003cstrong\u003e2.5 mm\u003c\/strong\u003e collar. The mounting flange is \u003cstrong\u003e24.0 mm\u003c\/strong\u003e wide with two \u003cstrong\u003eØ2.10 mm\u003c\/strong\u003e holes at \u003cstrong\u003e20.00 mm\u003c\/strong\u003e centres, and the connector block sits \u003cstrong\u003e10.5 mm\u003c\/strong\u003e across. Motor alone weighs about \u003cstrong\u003e13 g\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePackage\u003c\/th\u003e\n\u003cth\u003eWhat you receive\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Only\u003c\/td\u003e\n\u003ctd\u003e1 × stepper gear motor with 4-wire lead and 1.25-4Y connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + New Driver Board\u003c\/td\u003e\n\u003ctd\u003e1 × stepper gear motor, 1 × driver board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Driver Board in Case\u003c\/td\u003e\n\u003ctd\u003e1 × stepper gear motor, 1 × driver board in its enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCamera and sensor gimbals\u003c\/li\u003e\n\u003cli\u003eFocus and zoom drives\u003c\/li\u003e\n\u003cli\u003eSmall robot arms and grippers\u003c\/li\u003e\n\u003cli\u003eSmart furniture latches and dampers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eDo I need a driver?\u003c\/h3\u003e\n\u003cp\u003eYes. A bare stepper cannot run from a DC supply; it needs a stepper driver that sequences the two phases. The driver packages add one if you do not have it.\u003c\/p\u003e\n\u003ch3\u003eWhy are 10 Ω and 30 Ω both offered?\u003c\/h3\u003e\n\u003cp\u003eThey are different windings. The charts here are measured on 30 Ω. A 10 Ω winding draws more current at the same voltage, so match it to what your driver can deliver.\u003c\/p\u003e\n\u003ch3\u003eHow fine is the positioning?\u003c\/h3\u003e\n\u003cp\u003e0.047° per full step at 1:380, 1.86° at 1:10. Micro-stepping in the driver divides those further.\u003c\/p\u003e\n\u003ch3\u003eDoes it hold position with power off?\u003c\/h3\u003e\n\u003cp\u003eNo. Holding torque is an energised figure. With the driver disabled the shaft can be turned by hand or by load.\u003c\/p\u003e\n\u003ch2\u003eVisual Details\u003c\/h2\u003e\n\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-02-dimensions.webp?v=1792658796\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Outline drawing and bracket\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-02-dimensions.webp?v=1792658796\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eOutline dimensions\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-03-wiring-and-specs.webp?v=1792658802\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Wiring order and specification table\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-03-wiring-and-specs.webp?v=1792658802\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eWiring order and specifications\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-04-all-metal-gears.webp?v=1792658807\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"All-metal gear train\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-04-all-metal-gears.webp?v=1792658807\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eAll-metal gears\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-05-two-phase-four-wire.webp?v=1792658812\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Two-phase four-wire brushless stepper\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chs-gm12-15by-description-05-two-phase-four-wire.webp?v=1792658812\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003e2-phase 4-wire brushless stepper\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"CHIHAI MOTOR","offers":[{"title":"Motor Only \/ 1:10 \/ 10 Ω","offer_id":68091154202848,"sku":"GM12-15BY-MOT-R10-10R","price":16.78,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 1:10 \/ 30 Ω","offer_id":68091154235616,"sku":"GM12-15BY-MOT-R10-30R","price":16.78,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 1:20 \/ 10 Ω","offer_id":68091154268384,"sku":"GM12-15BY-MOT-R20-10R","price":16.78,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 1:20 \/ 30 Ω","offer_id":68091154301152,"sku":"GM12-15BY-MOT-R20-30R","price":16.78,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 1:30 \/ 10 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