YZR / YZ Crane Motor | Specifications & Selection Guide

YZR / YZ Crane Motor for Overhead Cranes & Metallurgical Applications

YZR and YZ series crane motors are three-phase induction motors designed for crane, metallurgical, and similar industrial machinery. They are intended for operating conditions involving frequent starting, braking, intermittent operation, vibration, and mechanical shock.

The YZR series uses a wound rotor, while the YZ series uses a squirrel-cage rotor. Motor selection depends on the required power, speed, duty cycle, starting frequency, braking conditions, electrical supply, and installation requirements.

Yuantai Crane supplies crane motor solutions for overhead cranes, EOT cranes, gantry cranes, metallurgical cranes, and other industrial lifting equipment. Our engineering team can evaluate the required motor configuration using your existing motor model, nameplate, crane mechanism specifications, or technical drawings.

Key Product Features

• YZR wound-rotor and YZ squirrel-cage motor series
• Three-phase electrical supply, with 380 V and 50 Hz specified in the catalog
• Multiple frame sizes and speed classes
• S2 short-time and S3 intermittent periodic duty ratings
• Technical data covering specified S4 and S5 operating conditions
• F-class and H-class insulation options
• IP44 and IP54 protection configurations
• Multiple cooling and mounting arrangements

Contact Us to Request YZR / YZ Crane Motor Selection

Single - shaft output Note: All frames above 180 are conical shafts

Dual-axis Output Note: All frames above 180 are conical shafts

Single - shaft output Note:112-160 frame sizes are all straight shafts

Dual-axis Output Note:112-160 frame sizes are all straight shafts

YZR / YZ Crane Motor — General Specifications

YZR vs. YZ Crane Motor

YZR and YZ motors are designed for crane and metallurgical applications. The main difference is their rotor construction, which affects motor selection and the requirements of the crane drive system. Understanding these differences helps buyers identify the appropriate motor series for their equipment.

• YZR series: Wound-rotor three-phase induction motor for metallurgical and crane applications, conforming to JB/T10105-1999.
• YZ series: Squirrel-cage three-phase induction motor for metallurgical and crane applications, conforming to JB/T10104-1999.
• Power output range and mounting dimensions comply with IEC72. The relation between power output and mounting dimensions is similar to JEM1202 (Japan) and DIN42681 (Germany); most are interchangeable.
• Rated voltage: 380 V; rated frequency: 50 Hz.
• Suitable for operation at altitudes up to 1,000 m.
• Insulation classes: Class F for ambient temperature up to 40 °C (general applications); Class H for ambient temperature up to 60 °C (metallurgical applications). Both classes share the same technical data.
• Protection: IP44 for general applications; IP54 for metallurgical applications.
• Good enclosure sealing.

The appropriate motor series depends on the crane mechanism, operating cycle, and electrical requirements. Before selecting a replacement motor or specifying a new one, confirm the existing motor model, rated power, speed, supply voltage, and duty rating. For YZR motors, also check the rotor specifications and starting requirements to ensure compatibility with the crane's control system.

YZR / YZ Crane Motor Model Designation

The YZR series is a wound-rotor three-phase induction motor designed for crane and metallurgical applications. The model designation encodes frame size, frame length and pole number.

Example: YZR 132M1-6

The catalog illustrates the model designation using YZR 132M1-6.

Model Designation Example: YZR132M1-6

• YZR: Wound-rotor crane and metallurgical motor series
• 132: 132 mm center height / frame size designation
• M1: Frame length designation
• 6: Number of poles

Each part of the model code tells you the motor's frame size, mounting length and speed characteristics — making it easy to match the motor to your crane duty and operating conditions.

Use the complete motor designation when requesting a quotation or identifying a replacement motor. The model alone may not establish every requirement, particularly when the existing motor has a special shaft, mounting arrangement, electrical configuration, or duty rating.

3. Frame Sizes, Power Ratings & Speed Classes

The catalog presents the relationship between motor frame size, synchronous speed class, and rated power. It also provides detailed performance tables for different operating duties.

Frame Size vs. Synchronous Speed and Power

Frame Size Range

The catalog covers frame sizes from 112 to 400, with available combinations depending on the motor series and configuration.

Speed Classes

These are the catalog's speed classes. The actual rated operating speed shown in the detailed performance tables can differ from the synchronous speed designation.

How to Read the Power Ratings

Motor output must be checked against the correct combination of:

• Frame size and model
• Speed class
• S2 or S3 duty rating
• S3 duty-cycle percentage
• Electrical and mechanical requirements

The catalog's frame-size table and detailed performance tables serve different purposes. Use the frame-size table for an initial model comparison, then confirm the applicable power, current, speed, rotor voltage, inertia, and weight in the detailed table for the selected model and duty.

Electrical Specifications

Voltage, frequency, power, speed, rotor configuration, and duty rating must be checked against the motor's actual nameplate and the requirements of the crane electrical system. Confirm any non-standard supply requirements before ordering.

Insulation, Protection & Environmental Conditions

Insulation Class

The catalog identifies F-class and H-class insulation configurations.

• Class F: The catalog specifies a standard ambient temperature not exceeding 40°C.
• Class H: The catalog identifies configurations for metallurgical applications with ambient temperatures up to 60°C.

The applicable motor configuration and temperature limit should be confirmed for the intended installation.

Protection Grade

The catalog lists IP44 and IP54 protection configurations.

The appropriate grade depends on the specified motor configuration and operating environment. Confirm whether additional protection is required for dust, moisture, heat, or other site conditions.

Installation Altitude

The catalog specifies an installation altitude of up to 1,000 m under its stated conditions. Installations outside those conditions require technical confirmation.

Cooling Methods

The catalog identifies three cooling codes across its motor configurations.

The catalog associates IC0041 primarily with smaller frame motors, IC0141 with larger frame motors, and IC0151 with a specified 400-frame configuration.

Check the cooling code for the exact motor model before specifying a replacement. Do not assume that all frame sizes use the same cooling arrangement.

Motor Construction & Main Components

The catalog includes construction and component information relevant to motor identification, installation, and maintenance. The following sections cover the stator and rotor, slip rings and brushes, bearings, and the construction schemes of the YZ and YZR crane motors.

Stator and Rotor

The motor's stator and rotor form the main electromagnetic assembly. The rotor construction differs between the YZR wound-rotor series and the YZ squirrel-cage series.

Slip Rings and Brushes

Slip-ring and brush information is relevant to YZR wound-rotor motors. The catalog provides component dimensions by frame size.

When replacing brushes or related components, confirm the motor frame and the dimensions in the applicable table.

Bearings

The catalog lists bearing arrangements by motor frame, including load-end and non-load-end bearing designations.

Use the original model and the applicable bearing table when identifying replacement components. Bearing designations should be confirmed against the exact motor configuration.

Construction Scheme of YZ 160-250 Motor

Fig.4 shows the main construction components of the YZ 160-250 crane motor. Each numbered part is identified below.

Main Components (1–14)

• 1. Shaft end key — transmits torque from the motor shaft to the driven equipment
• 2. Outer bearing cover — protects and secures the outer side of the bearing
• 3. End cover — closes the motor end and supports the bearing assembly
• 4. Inner bearing cover — secures the inner side of the bearing
• 5. Terminal box frame — holds the terminal box and electrical connections
• 6. Terminal box cover — protects the terminal connections
• 7. Rotor — the rotating part of the motor
• 8. Eyebolt — lifting point for motor handling and installation
• 9. Stator — the stationary electromagnetic part of the motor
• 10. Frame — the main motor housing and structural body
• 11. Fan cover — protects the cooling fan
• 12. Cooling fan — provides forced air cooling during operation
• 13. Bearing — supports the rotating shaft
• 14. Shaft — transmits mechanical power to the load

Construction Scheme of YZR 160-250 Motor

Fig.5 shows the main construction components of the YZR 160-250 wound-rotor crane motor. The 23 numbered parts are grouped below by function — from external protection and electrical connections to the core electromagnetic parts, cooling system and shaft output.

A. Housing & Protection

• 1. Dust-vent cover — covers the ventilation openings and keeps dust out
• 2. Outer bearing cover (non-drive end) — protects the outer side of the bearing
• 3. Front end cover — closes the front end of the motor housing
• 4. Inner bearing cover (non-drive end) — secures the inner side of the bearing
• 5. Dust shield (divider shield) — separates the slip-ring chamber from the main motor body

B. Electrical Connections

• 6. Slip ring — transfers electrical power to the wound rotor
• 7. Brush holder mounting rod — supports and positions the brush holders
• 8. Brush holder — holds the carbon brushes against the slip ring
• 9. Inspection cover — allows access to the slip ring and brush assembly
• 10. Terminal box frame — holds the terminal box and electrical connections
• 11. Terminal box cover — protects the terminal connections

C. Core Electromagnetic Parts

• 12. Stator — the stationary electromagnetic part of the motor
• 13. Rotor — the rotating wound-rotor part of the motor
• 14. Eyebolt — lifting point for motor handling and installation
• 15. Frame — the main motor housing and structural body

D. Cooling & Bearings

• 16. Inner bearing cover (drive end) — secures the inner side of the drive-end bearing
• 17. End cover (drive end) — closes the drive end of the motor
• 18. Fan cover — protects the cooling fan
• 19. Cooling fan — provides forced air cooling during operation
• 20. Bearing (drive end) — supports the rotating shaft at the drive end

E. Shaft & Output End

• 21. Outer bearing cover (drive end) — protects the outer side of the drive-end bearing
• 22. Shaft end key — transmits torque from the motor shaft to the driven equipment
• 23. Shaft — transmits mechanical power to the load

Construction Scheme of YZR 280-355 Motor

Fig.6 shows the main construction components of the YZR 280-355 wound-rotor crane motor. The 25 numbered parts are grouped below by function — including the rotor bearer and rotor clamper used on this larger frame size.

A. Housing & Protection

• 1. Dust-vent cover — covers the ventilation openings and keeps dust out
• 2. Outer bearing cover (non-drive end) — protects the outer side of the non-drive-end bearing
• 3. Front end cover — closes the front end of the motor housing
• 4. Inner bearing cover (non-drive end) — secures the inner side of the non-drive-end bearing
• 5. Dust shield (divider shield) — separates the slip-ring chamber from the main motor body

B. Electrical Connections

• 6. Slip ring — transfers electrical power to the wound rotor
• 7. Brush holder mounting rod — supports and positions the brush holders
• 8. Brush holder — holds the carbon brushes against the slip ring
• 9. Inspection cover — allows access to the slip ring and brush assembly

C. Rotor Support & Clamping

• 10. Bearer for rotor — supports the rotor assembly in this larger frame size
• 11. Rotor clamper — locks the rotor in position during transport or maintenance

D. Terminal Box

• 12. Terminal box frame — holds the terminal box and electrical connections
• 13. Terminal box cover — protects the terminal connections

E. Core Electromagnetic Parts

• 14. Stator — the stationary electromagnetic part of the motor
• 15. Rotor — the rotating wound-rotor part of the motor
• 16. Eyebolt — lifting point for motor handling and installation
• 17. Frame — the main motor housing and structural body

F. Cooling & Bearings

• 18. Inner bearing cover (drive end) — secures the inner side of the drive-end bearing
• 19. End cover (drive end) — closes the drive end of the motor
• 20. Fan cover — protects the cooling fan
• 21. Cooling fan — provides forced air cooling during operation
• 22. Bearing (drive end) — supports the rotating shaft at the drive end

G. Shaft & Output End

• 23. Outer bearing cover (drive end) — protects the outer side of the drive-end bearing
• 24. Shaft — transmits mechanical power to the load
• 25. Shaft end key — transmits torque from the motor shaft to the driven equipment

YZR / YZ Crane Motor Applications

YZR and YZ motors are intended for crane, metallurgical, and similar industrial machinery.

Typical application categories include:

• Overhead cranes and EOT cranes
• Gantry cranes and goliath cranes
• Metallurgical cranes
• Industrial lifting equipment
• Crane mechanisms involving frequent starting and braking
• Equipment operating under specified vibration and shock conditions

The correct motor depends on the mechanism, operating cycle, load characteristics, electrical supply, and installation conditions. Confirm the suitability of the selected motor for the intended hoisting or traveling mechanism.

YZR / YZ Crane Motor Replacement

Replacing an existing crane motor requires more than matching its power rating. Differences in frame size, speed, duty, electrical configuration, or shaft dimensions can prevent direct replacement.

Yuantai Crane can evaluate a replacement requirement using the following information:

• Existing motor model and nameplate photograph
• Motor series and rotor type
• Rated power and speed
• Voltage, frequency, and phase
• Duty type and operating cycle
• Rotor voltage where applicable
• Frame size and mounting arrangement
• Shaft extension and coupling dimensions
• Installation environment

CTA: Send Your Existing Motor Nameplate for Replacement Evaluation

YZR / YZ Crane Motor Specifications Summary

Note: The exact rated power, current, speed, rotor voltage, inertia, weight, and dimensional data must be confirmed in the detailed catalog table for the selected model and duty condition.

Request YZR / YZ Crane Motor Selection & Quotation

Need a crane motor for a new project or an existing crane? Send your motor model, nameplate, technical drawing, or operating requirements to Yuantai Crane.

Our team can review the applicable motor series, frame size, power rating, speed class, duty type, cooling arrangement, mounting configuration, and replacement compatibility.

Ordering Information

When ordering, please specify: motor type, output power, synchronous speed, insulation class, mounting arrangement, and duty type.

Example:YZR160M1-6   5.5 kW   1000 r/min   Class F   IM1001   S3-40%

• If two shaft extensions are required, this must be stated in the order; otherwise, the motor is supplied with one shaft extension.
• If no duty type is specified, the nameplate will show data for the basic duty S3-40% only.
• For duty types outside S2–S5, consultation with the manufacturer is required.
• For S4 and S5 duty, the motor selection must be verified against the actual load moment of inertia.

Use this final table beside the quotation form.

• Motor Series: YZR wound-rotor or YZ squirrel-cage (e.g., YZR)
• Motor Model: Existing or required model (e.g., YZR 132M1-6)
• Rated Power: kW (e.g., 5.5 kW)
• Speed: r/min (e.g., 1,000 r/min)
• Voltage / Frequency: V / Hz (e.g., 380 V / 50 Hz)
• Duty Type: S2 / S3 / S4 / S5 (e.g., S3-40%)
• Starting and Braking: Starts per hour and braking type (e.g., frequent starts with electromagnetic braking)
• Operating Environment: Temperature, dust, and moisture (e.g., indoor steel workshop)
• Mounting and Shaft Dimensions: Installation and mechanical interface (e.g., IM1001, matching shaft and coupling)
• Reference Documents: Nameplate photo or technical drawing (e.g., existing motor nameplate)

Recommended page structure: Keep the general specification table near the top, the frame/power table in the selection section, detailed performance tables in a dedicated technical-data section, and brush, bearing, cooling, and mounting tables lower on the page. This gives buyers a quick overview without sacrificing the technical depth needed for motor selection.