This is the main drive unit inside the DorRoller 45 operator — and unlike earlier generic parts, this one does have clear system-level specs from Dortech.

The DorRoller 45 uses:

 A 24V DC (system-controlled) geared motor integrated into the operator housing

Even though the unit is powered from 230V AC mains, the motor itself operates via the 24V DC control system inside the machine.

Official motor specifications

From the DorRoller 45 system:

• Motor power: 200W
• Drive force: 450 N
• Speed: ~200 mm/sec
• Control voltage: 24V DC
• Supply input (system): 230V AC

 These define the internal motor’s real performance — not just theory.

Electrical characteristics

Power architecture

• 230V AC → transformer/PSU
• Converted to → 24V DC system
• Feeds → motor via control PCB

Motor behaviour

• DC polarity switching
  • Forward polarity → open
  • Reverse polarity → close

Typical current draw (derived)

• ~200W / 24V ≈ 8–10A under load

This is why:

• Heavy wiring and PCB drivers are required

How it works in the system

Mechanical design

Motor type

• Brushed DC motor (standard for this class)

Gear system

• Integrated reduction gearbox
  • Converts:
    • High speed → high torque
• Required to achieve:
  • 450 N lifting force

Drive connection

• Directly coupled to:
  • Roller drum/shaft (roll-up door)

Performance characteristics

Lifting capacity

• Up to:
  • 120 kg doors / 12 m²

Speed profile

• Controlled electronically:
  • Soft start
  • Constant speed
  • Soft stop

Noise

• Designed to be:
  • Quiet operation (feature listed by Dortech)

Battery operation (important)

Optional system feature:

• 24V 3.5Ah battery backup

 Because the motor is DC:

• It can run directly off battery during power failure
• No inverter required

Protection & control

The motor is protected by the PCB via:

Electronic protection

• Overcurrent detection
• Obstacle sensing (via RPM/load feedback)
• Auto-reverse

Thermal protection

• Prevents overheating

Common failure symptoms

Motor failure

•  No movement at all
•  Humming or clicking only
•  Burning smell

Gearbox failure

• Motor runs but:
  • Door doesn’t move
• Grinding noise

Weak motor

• Door struggles to lift
• Slower than normal

Replacement reality

This is a model-integrated motor

• Not a universal loose motor
• Usually replaced as:
  • Motor + gearbox assembly
  • Or full head unit

 Important:

• Must match:
  • 24V system
  • Control PCB
  • RPM/limit system