BKM Series of 3-Stage High-Efficiency Hypoid Gear Motor

Name: BKM Series of 3-Stage High-Efficiency Hypoid Gear Motor
Brand: Raydafon
SKU: BKM-3-STAGE-GEARED-MOTOR
Availability: InStock

Raydafon BKM 3-stage helical hypoid gear motor is the high-ratio tier of the BKM family, with three gear stages stacked in a single housing. Ratios cover 60:1 to 300:1, which a 2-stage BKM cannot reach. Power range 0.2 to 7.5 kW and output torque up to 1500 Nm on the 1303 frame. Six frame sizes from BKM 0503 to BKM 1303 share the same helical hypoid gear family and 90° right-angle output layout. The helical hypoid gear pair offsets the output shaft at 90° and gives a higher single-stage ratio than a standard bevel gear while running smoothly under low-speed, high-torque load. Peak efficiency is up to 90%. Input accepts an IEC standard motor flange. Used on slow conveyors, mixers, hoists and rotary index tables where the drive must hold position between steps. OEM ratios, shafts, motor flanges and nameplate branding available.

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Product Description

BKM Series · 3-Stage

BKM Series 3-Stage High-Efficiency Hypoid Gear Motor for Very High Ratios

The BKM 3-stage is the high-ratio tier of the BKM helical hypoid geared motor series. It uses three gear stages stacked in a single housing to cover ratios from 60:1 to 300:1, which a 2-stage BKM cannot reach. Each stage is aligned and pre-loaded at the factory, so the customer does not need to match two or three separate gearboxes or build intermediate shafts on site. A helical hypoid gear pair offsets the output shaft at 90° and gives a higher single-stage ratio than a standard bevel gear, keeping the housing compact while running smoothly under low-speed, high-torque load. Peak efficiency is up to 90%, and output torque reaches up to 1500 Nm on the largest frame.

60 – 300 3-stage ratio range

90% Peak efficiency

1500 Nm Max output torque

BKM Series 3-Stage High-Efficiency Hypoid Gear Motor

3 gear stages · 90° right angle · Helical hypoid

01 · Stages

Three Gear Stages in One Housing

First Reduction

Input stage takes the motor speed down to an intermediate speed. It carries the motor flange on the input side and takes the first step of the overall ratio.

RoleInput reduction
Mounted onInput side
CarriesMotor flange

Second Reduction

Middle stage continues the ratio build from the first stage output. This is where the 3-stage unit adds the extra ratio that a 2-stage unit cannot cover.

RoleIntermediate reduction
Mounted onMiddle section
CarriesIntermediate torque

Third Reduction

Final stage takes the intermediate speed down to final output. The helical hypoid gear pair offsets the output at 90° and delivers the multiplied torque to the driven machine.

RoleOutput reduction
Mounted onOutput side
CarriesFinal output torque

02 · Comparison

3-Stage vs 2-Stage – When to Choose Which

This product

3-Stage BKM

60:1 – 300:1

Three gear stages stack extra ratio into the same housing concept. The 3-stage version is the right choice when the required output speed is very low and the driven machine needs the highest torque at that speed.

Ratio range60 – 300
Peak efficiencyup to 90%
Housing lengthLonger
Typical loadLow speed, high torque

2-Stage BKM

7.5:1 – 60:1

Two gear stages cover the lower ratio window. Because one fewer stage means less cumulative sliding friction, the 2-stage version reaches higher peak efficiency than the 3-stage version.

Ratio range7.5 – 60
Peak efficiencyup to 92%
Housing lengthShorter
Typical loadGeneral industrial

03 · Models

Standard 3-Stage Model Range

BKM 0503 Small frame

Ratio60 – 300

Power0.2 – 0.55 kW

Torqueup to 80 Nm

BKM 0633 Small frame

Ratio60 – 300

Power0.37 – 1.1 kW

Torqueup to 164 Nm

BKM 0753 Medium frame

Ratio60 – 300

Power0.55 – 2.2 kW

Torqueup to 260 Nm

BKM 0903 Medium frame

Ratio60 – 300

Power1.1 – 4.0 kW

Torqueup to 460 Nm

BKM 1103 Large frame

Ratio60 – 300

Power2.2 – 5.5 kW

Torqueup to 660 Nm

BKM 1303 Largest frame

Ratio60 – 300

Power4.0 – 7.5 kW

Torqueup to 1500 Nm

04 · Application

Typical Applications

Slow Conveyor Lines

Heavy belt and screw conveyors where the output speed must be very low but the torque very high.

Rotary Mixers & Agitators

Chemical and food-processing mixers that need slow, steady rotation at high torque.

Hoists & Winches

Lifting equipment with very low output speed and continuous load holding duty.

Rotary Index Tables

Slow indexing tables on automation lines where the drive must hold position between steps.

Slow-Revolution Process Drives

Coating drums, winding reels and other slow process axes that need a 90° compact drive.

05 · Quality

Quality Assurance and OEM Customisation

Quality & Testing

ISO 9001:2015 certified quality management from raw material to final assembly. Products comply with IEC, DIN and GB standards.

ISO 9001:2015 certified
100% backlash test
Housing bore concentricity check
Noise and vibration check
Full material traceability

Custom & OEM Options

Custom motor flange for any IEC motor
Custom output shaft and keyway
Special ratios beyond 300:1
Higher IP rating for washdown
Food-grade lubricant for food lines
Special lubricants for extreme temperatures
Custom paint and nameplate branding

06 · FAQ

Frequently Asked Questions

What ratio range does the 3-stage BKM cover?

The 3-stage BKM covers ratios from 60:1 to 300:1. This is the very-high-ratio window that a 2-stage BKM cannot reach, and it is used when the driven machine needs a very low output speed. Custom ratios beyond 300:1 are available on request for OEM projects.

What is the difference between the 3-stage BKM and the 2-stage BKM?

Both versions share the same helical hypoid gear family and the same 90° output layout. The 3-stage BKM covers ratios 60 to 300 with peak efficiency up to 90% and is used for very low-speed, high-torque axes. The 2-stage BKM covers ratios 7.5 to 60 with peak efficiency up to 92% and is used for general industrial drives where the ratio fits that window. Choose the 3-stage only when the required ratio is above 60:1.

Why is the 3-stage version slightly lower in efficiency than the 2-stage version?

Every gear stage adds a small amount of sliding friction loss. Because the 3-stage version has one more stage, its cumulative efficiency is 90% compared with 92% for the 2-stage version. The 3-stage version is chosen for its ratio coverage and torque level at very low output speed, not for its efficiency. If your required ratio fits the 2-stage range, the 2-stage version is the correct choice.

What frame sizes and power range does the 3-stage BKM cover?

Six frames cover the 3-stage range: BKM 0503, BKM 0633, BKM 0753, BKM 0903, BKM 1103 and BKM 1303. Power range is 0.2 to 7.5 kW and maximum output torque reaches up to 1500 Nm on the 1303 frame. Each frame shares the same helical hypoid gear family and 90° output layout, and differs in the power and torque window it covers.

Can the 3-stage BKM accept a servo motor?

The input side accepts an IEC standard motor flange for three-phase or brake motors by default. Custom flanges for servo motors are available on request for OEM projects. If you need a pre-assembled servo motor package, the BKM Series with Servo Motor page is the correct product.

What is the warranty period and OEM lead time?

We provide an 18-month warranty from shipment date covering manufacturing defects, with full technical support. Standard 3-stage BKM models are stocked; custom OEM orders typically ship within 25–35 working days after drawing confirmation.

Send Your 3-Stage BKM Application Data

Provide required output torque, output speed, ratio, input power, mounting configuration and driven machine description. Raydafon will confirm the correct 3-stage BKM frame, ratio and motor flange, and reply with a factory-direct quotation within 24 hours.

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Contact Info

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Address

Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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Tel

+86-574-87167707
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Email

[email protected]

We are happy to provide a quote for any of our products. Give us a call at 86-574-87167707 or fill out the form below and one of our engineers will be in touch shortly. Please include a product description and any customizations you need.