PM42 Permanent Magnet DC Servo Stepper Motor 500 PPS 12V 0.240A/Phase 7.5° 120:1 Gearbox

The PM42 Permanent Magnet DC Servo Motor offers stable and precise motion control for compact automation systems. Featuring a 120:1 gear reduction ratio, this motor provides enhanced torque output and consistent performance at low speeds. Designed for reliability, it’s suitable for industrial instruments, medical devices, and precision control systems.

Key Features

• Detent torque output of 160 N.cm min with 120:1 gear ratio
• Accurate 7.5° step angle for precise positioning
• Low noise, low vibration permanent magnet stepper design
• Rated voltage: 12V DC, rated current: 70 N.cm min
• Compact 42mm body suitable for tight spaces

Technical Specifications

Item	Specification
Step Angle	7.5°
Number of Phase	4
Rated Voltage	12 VDC
Detent Rated Current	160 N.cm max
Phase Resistance	50Ω ±7% (At 20°C)
Pull-in Torque (at 100 PPS)	70 N.cm min
Maximum Start Rate	500 PPS
Insulation Class	E
Ambient Temperature	-10°C ~ +50°C
Motor Weight	Approx. 0.2 kg

Wiring Connection Table

Wire Color	Phase	Function	Note
Red (RED)	A	Coil A	Phase A excitation
Blue (BLU)	B	Coil B	Phase B excitation
Brown (BRN)	C	Coil C	Phase C excitation
Yellow (YEL)	D	Coil D	Phase D excitation
Black (BLK)	O	Common	Common wire (shared return)
Black (BLK)	O	Common	Common wire (shared return)

Excitation Sequence (Full Step Driving)

Colour	Phase	Step 1	Step 2	Step 3	Step 4
Red (RED)	A	−			–
Blue (BLU)	B	–	–
Brown (BRN)	C		−	–
Yellow (YEL)	D			−	–
Black (BLK)	O	+	+	+	+
Black (BLK)	O	+	+	+	+

Note:

This permanent magnet geared stepper motor uses a 6-wire configuration (4 phases + 2 common wires). The excitation sequence determines the rotation direction — clockwise (CW) or counterclockwise (CCW) — when viewed from the mounting surface. Proper phase energizing ensures smooth and accurate step movement.

Applications

• Automation equipment and robotics
• Medical instrumentation
• Position control in camera and optical systems
• Textile and labeling machinery

Why Choose Our PM42 Permanent Magnet Stepper Motor?

Our pm stepper motors are designed with durability and precision in mind. Each unit undergoes strict testing to ensure consistent performance. The combination of PM stepper technology and a robust gearbox ensures reliability and long life in demanding applications.

FAQ

What is a PM stepper motor?

A PM stepper motor uses a permanent magnet rotor to generate a magnetic field, providing discrete step movements and high positional accuracy.

What is the difference between permanent magnet and variable reluctance motors?

While a permanent magnet stepper motor uses magnetic poles on the rotor, a variable reluctance motor relies on soft iron rotors without permanent magnets. PM stepper motors generally provide higher torque and smoother operation at low speeds.

Download Datasheet

Download the full specification sheet for detailed parameters, wiring guide, and performance curves.

📄 Download PDF Datasheet