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The mainstream range comes in 100 to 40,000rpm and 60 and 120-degree units.
China's selection of brushless motors has models with rated power of 1 to 7,500W, and input voltage of 5, 12, 24, 36 and 48V. There are 100 to 40,000rpm, and 60 and 120-degree variants.
A further categorization is by rotor construction. Types with an outer rotor boast relatively low cogging torque. These operate at lesser duty cycles or rated current, owing to the location of the stator windings. Inner counterparts have the advantage of heat dissipation, which has a direct impact on torque, and reduced rotor inertia. The latter kind dominates local makers' output.
Between sensored and sensorless units, the former account for over 80 percent of production. Sensored models adopt mainly Hall-effect position sensors for the components' lower cost. For high precision dynamic positioning, makers offer versions with optical or magnetic encoders.
Brushless motors adopting NdFeB magnetic materials lead output, and those with AlNico and ferrite account for the rest.
Regardless of type, releases have 80 to 90 percent efficiency, and built-in safety features against undervoltage, overcurrent and short circuit. These can withstand more than 20,000 hours of operation. The last is based on the bearing life span.
Companies modify products' voltage, current, power, speed, torque and dimensions to match diverse requirements.
Suppliers use local enameled copper and electric wire, magnetic materials, metal, PCBs, passive components and MOSFETs. They usually purchase bearings from Japan. For chips in the built-in electronic drivers of integrated models, makers rely on key foreign providers such as TI, Freescale, Fairchild and Atmel.
The cost of manufacturing inputs is expected to stay steady until year-end, which will help companies keep prices competitive despite climbing labor expenditure.
Here is a selection of brushless motors from China:
Changzhou Sherry Motors Co. Ltd's SH-33WS model is a 3-phase, 4-pole brushless motor with wye connection. It has a maximum speed of 4,600rpm and suits medical and laboratory equipment, fans and pumps.
The low-voltage and -current unit has a die-cast zinc housing and front end cap. It is 33mm in diameter and weighs less than 200g. The price is $14.90.
The minimum order is 500 units, and delivery takes 40 days.
The CL-WS1512W model from Guangdong Chaoli Micro-motor Machinery Co. Ltd is a 7.2VDC permanent-magnet brushless motor. It has 33,000rpm speed, 49Nm torque, 4.2A current and 32W power output under full-load condition, and 39,000rpm and 1.2A with no load.
The model supports clockwise and counterclockwise rotation. It uses an NdFeB magnet and has a 1.5mm-diameter nickel-coated SUS304 stainless steel shaft. The housing is made of H62 brass and SUS304 stainless steel. The motor is about 20g. Customization is welcome.
The minimum order is 500 units. Delivery lead time is 15 to 30 days.
Autom Tech. Industry Co. Ltd's model 001 brushless motor boasts 32,000rpm and 50W output. It runs on 12VDC. The unit has a life span exceeding 5,000 hours. It goes for $12.
The ST86mm BL DC Motor model from Changzhou Sutai Electrical Appliance Co. Ltd has 5,000rpm speed and 110 to 440W power. It has closed-loop control, and constant speed and torque.
The 48V unit is 86mm in diameter and 57 to 95mm long. It meets CE, RoHS and TÜV.
The micromotor goes for $25 to $85. Delivery takes 7 to 25 days.
The BL4225O model from Dongguan Country Dream Motor Co. Ltd is an integrated brushless motor for personal care and home products, and industrial, medical and office equipment. It can rotate clockwise and counterclockwise.
The 42x25mm unit has pulse width modulation speed control and frequency-generated speed feedback signal. It exhibits high efficiency, and low EMC and noise, and has built-in overcurrent and under/overvoltage protection. The minimum life span is 10,000 hours.
The price is $8.50. The minimum order is 1,000 units, and delivery is within 25 days. OEM and ODM orders are accepted.
This model TEC4260 integrated brushless motor from TT Motor (Shenzhen) Industrial Co. Ltd has 4,300 to 8,400rpm and 0.02 to 0.04Nm torque. It comes in 12, 24 and 310V versions.
The model supports clockwise and counterclockwise rotation, and has pulse width modulation speed control and frequency-generated speed feedback signal. Its safety features include overcurrent and under/overvoltage protection. The life span is 30,000 hours.
The RoHS-compliant unit is 42x60mm and about 250g. It is priced at $10.50. The minimum order is 500 units. Delivery takes 30 days.
Ningbo Jirun Electric MachineCo. Ltd's model 90WS permanent-magnet brushless motor has 300 to 30,000W power. It comes in 12, 24, 36, 48 and 72V versions.
The CE-approved unit boasts a wide speed range, high starting torque and good braking performance. It comes in diameters of 60, 80, 90, 110, 120, 130 and 180mm.
The product is priced at $100. No minimum order is required. Delivery is within 15 days.
Shenzhen Power Motor Industrial Co. Ltd offers model PBL7120230 brushless motor, which at maximum load has 1,812rpm speed, 272.5mNom torque, 0.385A current and 64 percent efficiency. Under no-load condition, the speed and current are 2,500rpm and 0.107A. The 230V/50Hz unit suits fuel pumps.
The minimum order is 500 units. Delivery lead time is 30 to 45 days.
Tianlong (Hong Kong) Industrial Co. Ltd's model BL4070-01 sensorless brushless motor in integrated design operates at 16,000rpm and 18,000rpm respectively under full- and no-load conditions. It is rated at 24VDC, 1.8A, with no-load current of 0.4A.
The 25W unit measures 40x70mm. It is priced at $36. The minimum order is 100 units for delivery within 15 days.
Wuxi Junhong Automation Technology Co. Ltd's model ME057AG Series consists of 8-pole brushless motors with shielded ball bearings, aluminum end caps and a NEMA 23 flange.
The IP42-rated unit has 6,000rpm maximum speed and 120-electrical degree Hall-effect feedback. It operates in up to 170VDC. The price is $15, and the minimum order is 3,000 units. Delivery lead time is 30 days.
The model BL6082SI brushless motor from Yateng Motor (Shenzhen) Co. Ltd runs at 6,200rpm and 7,000rpm under full- and no-load conditions. It has 0.11Nm rated torque. The rated voltage and output are 24V and 75W, and the no-load current is ≤600mA.
The RoHS-compliant unit boasts up to 84 percent efficiency and less than 40dB noise. It suits nebulizers, therapy products and smart home devices. The motor has a life span of at least 10,000 hours. Its diameter and length are 60mm and 82mm.
The maker requires a minimum order of 500 units and delivers within 30 to 40 days. OEM and ODM orders are accepted.
The ZJ-ZWW92 model from ZJTex Electric Group Co. Ltd is a brushless motor and fan with 2,600rpm speed and 1,125 cubic meters per hour airflow. It has 100W rated power.
The 24V, 4.17A unit uses pulse width modulation speed control. It goes for $25. The maker requires a minimum order of 1,000 units. Delivery is within 35 days.
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