Motor Step Angle: 7,5°, full step
Number of Phase: 2, bipolar
Insulation resistance: 100 MΩ, 500Vdc
Insulation class: E
Coil Resistance/Induction: 7,5Ω/10mH
Max temp. (motor housing): 60 °C
Racc. temp (motor housing): 35-45 °C

Nominal voltage: 12V
Voltage driver: 3,75 – 36V
Max axial/radial shaft load: 10N/50N
Max allow torque: 100 Ncm
Max current (continuous): 250 mA
Max current (non-contin.): 500 mA
Operating temp.: -20 °C/+65 °C


Type	Ratio To:1	Length (mm)	Holding Tourqe (mNm)	Max Speed (rpm)
GM34-15-35	14.14	43.3	700	105
GM34-30-35	29.75	43.3	1500	50
GM34-75-35	76.84	45.8	1500	20
GM34-100-35	94.37	45.8	1500	16
GM34-200-35	198.5	48.3	1500	7
GM34-250-35	243.8	48.3	1500	6
GM34-510-35	512.85	51.3	1500	3
GM34-630-35	629.82	51.3	1500	2

Stepper Gearmotor Driver Available

The step-motor is a synchronous electric motor with pulsed direct current and brushless electronic control which can divide its rotation into a large number of steps. Unlike brush DC motors, the position of the motor can be accurately controlled without an encoder (feedback).

GM34 Step Motor with Gearbox

Introduction

The GM34 series is the most powerful stepper gearmotor in the GM family, designed for demanding applications that require high torque, precise positioning, and reliable operation. With a 7.5° full-step angle, 2-phase bipolar design, and gearbox ratios ranging from 15:1 up to 630:1, the GM34 delivers holding torque up to 1500 mNm while maintaining smooth motion in a compact housing length of 43.3–51.3 mm.

Technical Highlights

Motor type: 2-phase bipolar stepper motor
Step angle: 7.5° (full step)
Nominal voltage: 12 V (driver range 3.75 – 36 V)
Coil resistance/induction: 7.5 Ω / 10 mH
Insulation class: E
Insulation resistance: 100 MΩ at 500 VDC
Maximum housing temperature: 60 °C (recommended 35–45 °C)
Operating temperature range: –20 °C to +65 °C
Shaft loads: up to 10 N axial, 50 N radial
Maximum torque: 100 Ncm
Continuous current: 250 mA (500 mA peak)
Driver: compatible with GM-STEP-DRIVER-1

Gearbox Options

Model	Ratio	Length (mm)	Holding Torque (mNm)	Max Speed (rpm)
GM34-15-35	14:1	43.3	700	105
GM34-30-35	30:1	43.3	1500	50
GM34-75-35	77:1	45.8	1500	20
GM34-100-35	94:1	45.8	1500	16
GM34-200-35	199:1	48.3	1500	7
GM34-250-35	244:1	48.3	1500	6
GM34-510-35	513:1	51.3	1500	3
GM34-630-35	630:1	51.3	1500	2

This broad range of gearbox ratios allows the GM34 to deliver either moderate speeds with high torque or ultra-slow, high-precision movement for positioning tasks.

Advantages

High holding torque: up to 1500 mNm across multiple gearbox ratios.
Strong mechanical design: handles higher shaft loads (10 N axial, 50 N radial) compared to other GM models.
Versatile gearing: ratios from 15:1 to 630:1 for optimized speed and torque balance.
Compact yet powerful: length 43.3–51.3 mm, ideal for heavy-duty applications in limited spaces.
Accurate step control: precise positioning without encoders.

Suggested Applications

Industrial Automation
- CNC subsystems, packaging machines, and heavy-duty conveyors.
Medical & Laboratory Systems
- Motorized patient-handling equipment, diagnostic machines, and lab automation requiring stable torque.
Robotics & Mechatronics
- Robotic arms, grippers, and actuators needing higher force.
Aerospace & Defense Subsystems
- Compact actuators, positioning units, and mechanisms demanding durability under load.
Specialty Equipment
- Automated machinery, material handling systems, and equipment requiring high holding torque at low speed.

The GM34 Step Motor with Gearbox is the strongest model in the GM stepper motor family, offering holding torque up to 1500 mNm and robust shaft load capacity in a compact form factor. With gearbox ratios from 15:1 to 630:1, it provides engineers with a highly versatile solution for automation, robotics, medical, and industrial applications where high torque and precision are critical.

GM34 Step Motor