CHF-GM12-N20VA Steel-Frame Gear Motor

Overview

The CHIHAI MOTOR CHF-GM12-N20VA DC gear motor uses a compact steel-plate gear frame, metal gears and a D-shaped output shaft. Choose the package, reduction ratio and exact voltage/winding version independently. The available options contain only real supplied configurations.

Features

Steel frame supports the reduction gear axles for compact mechanisms.
Copper-wound rotor and metal gear train.
3 mm D shaft for couplings and pulleys.
Motor-only, plastic mounting bracket and mini PWM speed-controller packages.
K100 carbon-brush versions offer distinct speed/load points and can be noisier than the other windings.

Specifications

Model	CHIHAI MOTOR CHF-GM12-N20VA steel-plate-frame permanent-magnet brushed DC gear motor
Selection	3V, 6V or 12V with exact winding designator; 45, 26, 35, 05 and K100 are motor versions, not voltages
Output shaft	3 mm diameter D shaft, 2.5 mm flat; standard drawing projection 10 mm
100:1 selection	Special source designation Shaft 10.4 D6.5 retained; check selected shaft fit rather than assuming the standard drawing
Mechanical drawing	Gear section 9 mm, motor section 16 mm, shaft shoulder 0.7 mm, rear reference 1.0 mm; motor body Ø12.1 mm MAX
Mounting	Two M1.6 holes; front plate 12 mm, 9 mm hole-reference spacing; front boss Ø4 mm, lower-view Ø5.0 / 7.7 mm references
Mass	Approximately 10 g motor net reference; shipping weights are separate estimates
Construction	Steel-plate gear frame, metal gears and copper rotor windings
Controller option	DC 2.2–12.0V supply, 1.8–12V adjustable reference; current must remain below 2A
Controller features	RV097NS switched potentiometer, 7 mm panel opening, 2A resettable fuse, LED indicator and screw terminals
Bracket option	Plastic N20 bracket with pictured two screws and two nuts; verify mounting dimensions

Voltage and Winding Performance

Each table is a separate motor version. Match voltage, winding and ratio together. Ratios 210:1 and 1000:1 appear as family references only and are not offered as extra SKU combinations. No-load speed, rated speed, rated torque and stall values have different meanings. Values below retain the reference table, including non-monotonic points; they are not interpolated or silently corrected.

3V / 45

Motor input power 0.5 W; no-load current ≤45 mA; rated current ≤0.27 A; stall current ≤0.65 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	1200	40	3.9	780	0.1
20	600	80	7.8	390	0.2
30	400	120	11.8	260	0.3
50	240	200	19.6	150	0.5
100	120	400	39.2	80	1
150	80	600	58.8	52	1.5
210	57	800	78.4	37	2
298	40	1200	117.6	26	3
380	32	1600	156.9	20	3.5
1000	12	1600	156.9	10	3.5

3V / 26

Motor input power 0.2 W; no-load current ≤45 mA; rated current ≤0.14 A; stall current ≤0.35 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	810	25	2.5	460	0.06
20	405	100	9.8	240	0.12
30	270	75	7.4	160	0.15
50	162	120	11.8	90	0.4
100	81	250	24.5	47	0.8
150	54	350	34.3	32	1
210	38	500	49	23	1.3
298	27	1000	98	16	1.8
380	21	1200	117.6	12	2
1000	8	1600	156.9	5	3.5

6V / 26

Motor input power 0.6 W; no-load current ≤45 mA; rated current ≤0.23 A; stall current ≤0.55 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	1650	50	4.9	980	0.11
20	825	100	9.8	490	0.22
30	550	150	14.7	326	0.35
50	330	250	24.5	193	0.6
100	165	500	49	98	1.1
150	110	750	73.5	65	1.8
210	78	1000	98	46	2.5
298	54	1500	147.1	32	2.5
380	43	1900	186.3	25	2.5
1000	16	2500	245.1	10	2.5

6V / 35

Motor input power 0.4 W; no-load current ≤40 mA; rated current ≤0.1 A; stall current ≤0.3 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	1050	20	2	750	0.1
20	525	40	3.9	375	0.16
30	350	60	5.9	250	0.24
50	210	100	9.8	150	0.4
100	105	200	19.6	75	0.8
150	70	300	29.4	50	1.2
210	50	400	39.2	35	1.6
298	35	600	58.8	25	2.3
380	28	750	73.5	20	3
1000	10	2000	196.1	7	3.5

12V / 05

Motor input power 0.6 W; no-load current ≤30 mA; rated current ≤0.07 A; stall current ≤0.3 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	1500	20	2	1200	0.1
20	750	40	3.9	600	0.16
30	500	60	5.9	400	0.24
50	300	100	9.8	240	0.4
100	150	200	19.6	120	0.8
150	100	300	29.4	80	1.2
210	71	400	39.2	57	1.6
298	50	600	58.8	40	2.3
380	39	750	73.5	31	3
1000	15	2000	196.1	12	3.5

12V / 35

Motor input power 1.4 W; no-load current ≤55 mA; rated current ≤0.2 A; stall current ≤0.5 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	2150	50	4.9	1450	0.13
20	1075	100	9.8	720	0.26
30	717	150	14.7	480	0.39
50	430	250	24.5	290	0.7
100	215	500	49	145	1.3
150	143	750	73.5	95	2
210	102	1000	98	70	2.7
298	72	1500	147.1	48	3
380	57	1900	186.3	38	3
1000	21	3000	294.1	14	3.5

3V / K100 Carbon Brush

Motor input power 0.5 W; no-load current ≤150 mA; rated current ≤0.45 A; stall current ≤1 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	1500	40	3.9	780	0.1
20	750	80	7.8	390	0.2
30	400	120	11.8	260	0.3
50	310	200	19.6	150	0.5
100	155	400	39.2	80	1
150	105	600	58.8	52	1.5
210	74	800	78.4	37	2
298	50	1200	117.6	26	3
380	40	1600	156.9	20	3.5
1000	15.5	1600	156.9	10	3.5

6V / K100 Carbon Brush

Motor input power 1.7 W; no-load current ≤200 mA; rated current ≤0.9 A; stall current ≤2 A.

Ratio :1	No-load rpm	Rated g.cm	Rated mN.m	Rated rpm	Stall kg.cm
10	3200	80	7.8	1580	0.2
20	1600	160	15.6	780	0.4
30	1050	240	23.6	530	0.6
50	640	400	39.2	310	1
100	320	800	78.4	170	2
150	210	1200	117.6	110	≥3.0*
210	150	1600	156.9	78	≥3.0*
298	105	2400	235.3	56	≥3.0*
380	84	3000	294.1	45	≥3.0*
1000	32	3000	294.1	25	≥3.0*

* For the 6V K100 high-ratio columns, the stall-torque reference is ≥3.0 kg.cm, but the gearbox must not be used above 3.0 kg.cm or held stalled. Stall figures are not continuous operating ratings. The K100 carbon-brush end-cap design is intended for brush life and uses a silicon-steel core; no quantified life or temperature guarantee is provided.

Mechanical Fit and Package Accessories

The original engineering drawing below retains its geometry, hole locations and numeric references. Its standard 10 mm shaft view does not replace the special 100:1 selector designation. Check actual shaft projection and flat engagement before selecting a coupling. Steel-frame construction supports the gear axles against movement under load; comparison photos of a copper-frame alternative do not add that alternative to this listing.

The optional plastic bracket references 10 mm opening, 14.5 mm upper feature, 11.3 mm side feature, 12 mm lower feature, 25 mm overall width and 18.5 mm mounting-spacing reference. Use the pictured screws/nuts and verify clearance before installation.

Controller and Connection

The mini controller is a DC PWM speed-control accessory with DC 2.2–12.0V supply and a 1.8–12V adjustable reference. Keep current below 2A and within the selected motor rating; the 2A resettable fuse is protection, not a continuous motor rating. The RV097NS potentiometer includes an on/off switch and uses a 7 mm panel opening. An LED indicates power; screw terminals provide connections. Follow the board markings for supply and motor terminals. Supply DC only, and do not connect mains directly. This package does not promise an electronic reversing switch; reverse a bare motor by reversing its motor supply polarity after stopping.

What's Included

Motor Only: one selected steel-frame gear motor.
Motor + Mounting Bracket: one selected motor and one pictured plastic bracket.
Motor + Mini PWM Controller: one selected motor and one mini PWM controller.
Motor + Bracket + Mini PWM Controller: one selected motor, one bracket and one mini controller.

The bracket accessory illustration shows two screws and two nuts. Package images show alternatives, not four motors in one purchase. A power supply, encoder, chassis, coupling and complete machine are not included.

Applications

Small robotic mechanisms, motorized curtains, balancing-vehicle development, smart locks and compact motion projects where the selected speed, load and mechanical fit are suitable.

Installation and Operation

Match the exact voltage/winding to the power supply and controller. Avoid overload, frequent loaded starts, frequent rapid reversals and stalled operation. Do not force the output shaft to turn while unpowered; back-driving can damage the reduction gears. Gear noise and speed vary with winding, ratio and load.

FAQ

Does 45, 26 or 35 mean the supply voltage?

No. These are motor-version designators. Select the explicit 3V, 6V or 12V supply rating.

Are all performance-table ratios available?

No. Only the ratios in the product selector are purchasable.

Is the controller included with every motor?

No. Choose a package that explicitly includes the Mini PWM Controller.

Visual Details

Original N20VA engineering drawing - millimetres

Mini PWM controller and mounting bracket

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CHIHAI CHF-GM12-N20VA Steel-Frame DC Gear Motor, 3V/6V/12V

CHIHAI CHF-GM12-N20VA Steel-Frame DC Gear Motor, 3V/6V/12V

Overview

Features

Specifications