ISO 23777:2020 Conical Rotor Motor for Electric Hoists
ISO 23777:2020, "Conical Rotor Motors for Electric Hoists," is the product standard governing conical rotor motors specifically designed for electric hoists. The standard specifies the motor power range (0.2–15 kW), rated rotational speed (~1380 r/min), taper ratio (1:10), braking torque (≥1.5× rated load moment), protection rating (IP54), insulation class (Class F), cooling method (self-ventilated), duty classification (S3–S4 with a 25%–40% duty cycle), and test methods (insulation resistance ≥1 MΩ, dielectric test at 1500 V for 1 minute, braking torque ≥1.5× rated, vibration ≤1.8 mm/s, temperature rise ≤100 K).
Technical Requirements for Conical Rotor Motors
The power range is 0.2–15 kW with a rated rotational speed of approximately 1380 r/min. Both the stator bore and the rotor outer surface are conical, with a taper ratio of 1:10. When the motor is energized, the magnetic pull overcomes the spring force, causing the rotor to move axially and disengage from the braking cone, allowing rotation. When power is cut off, the spring pushes the rotor back against the braking cone to apply the brake. The braking torque is ≥1.5 times the rated load moment. The protection rating is IP54, and the insulation class is Class F. Cooling is self-ventilated, with a duty classification of S3–S4 and a duty cycle of 25%–40%. Kelude Heavy Industry supplies conical rotor motors according to the standard.
Inspection and Standards Compliance
Factory Acceptance Tests are performed unit by unit, covering insulation resistance ≥1 MΩ (measured with a 500 V Megohmmeter/Insulation Tester), a dielectric test at 1500 V for 1 minute with no breakdown, no-load current and rotational speed measurement, braking torque testing at ≥1.5× the rated load moment, and vibration velocity ≤1.8 mm/s. Type Tests include a temperature rise test under rated load (temperature rise ≤100 K for Class F insulation) and a durability test of 2000 hours without failure. Kelude Heavy Industry motors are supplied with Factory Acceptance Tests performed according to the standard.
| Item | Requirement |
|---|---|
| Power | 0.2~15kW |
| Rotational speed | 1380r/min |
| Taper | 1:10 |
| Braking torque | ≥1.5Times |
| Protection | IP54 |
| insulation | FClass |
| Inspection | Period |
|---|---|
| factory | unit by unit |
| Annual Inspection | Annually |
The cone rotor motor is a dedicated hoisting motor for electric hoists, featuring an integrated design that combines the motor and brake in a single unit. Both the stator bore and the rotor outer surface are conical with a 1:10 taper. When the motor is energized, the rotating magnetic field in the stator exerts an axial magnetic pull on the rotor, overcoming the brake spring force and allowing the rotor to move axially, disengaging the brake cone surface for normal rotation. When power is cut off, the magnetic pull disappears, and the brake spring pushes the rotor back against the brake cone, generating braking torque through cone-surface friction to bring the hoist to a stop. This design eliminates the need for a separate brake and electromagnet, resulting in a compact structure and high reliability. Braking torque is ≥1.5 times the rated load moment, ensuring reliable braking under any load. The motor offers IP54 protection, Insulation Class F, self-cooling via fan, and a duty classification of S3–S4. With a motor power range of 0.2–15 kW, it covers the full spectrum of electric hoist specifications. Kelude Heavy Industry supplies cone rotor motors in accordance with ISO 23777.
FAQ
Q: How does a cone rotor motor work?
A: Both the stator bore and the rotor outer surface are conical with a 1:10 taper. When the motor is energized, the rotating magnetic field in the stator exerts an axial magnetic pull on the rotor, overcoming the brake spring force and allowing the rotor to move axially, disengaging the brake cone surface — the motor rotates. When power is cut off, the magnetic pull disappears, and the brake spring pushes the rotor back against the brake cone, generating braking torque through cone-surface friction. The compact design eliminates the need for a separate brake and electromagnet.
Q: What are the key technical parameters?
A: The power range is 0.2–15 kW, covering all electric hoist specification requirements. Rated rotational speed is approximately 1380 r/min. Braking torque is ≥1.5 times the rated load moment, ensuring reliable braking under any load. IP54 protection suits general industrial environments. Insulation Class F allows a temperature rise of up to 100 K. Duty classification is S3–S4 with a duty cycle of 25%–40%, and cooling is self-ventilated.
Q: What does the factory acceptance test cover?
A: The routine test includes insulation resistance ≥1 MΩ (measured with a 500 V Megohmmeter), a dielectric test at 1500 V for 1 minute with no breakdown, no-load current and rotational speed measurement, and a braking torque test verifying ≥1.5 times the rated load moment. Vibration velocity is ≤1.8 mm/s. The type test includes a temperature rise test at rated load (≤100 K) and a durability run of 2000 hours without failure. Kelude Heavy Industry motors undergo factory inspection according to the standard.
Q: What cone rotor motor specifications does Kelude offer?
A: Kelude Heavy Industry supplies cone rotor motors for electric hoists in accordance with ISO 23777:2020, with a power range of 0.2–15 kW, a rotational speed of 1380 r/min, and braking torque ≥1.5 times the rated load moment. Insulation Class F and IP54 protection are standard. These motors are applicable to the hoisting mechanisms of both wire rope electric hoists and chain electric hoists.
