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MOTOR MANUFACTURER · Zhejiang, CHINA
Zhejiang Doyin Technology Co., Ltd.
Zhejiang Doyin Technology publishes its submersible-motor range under the DONGYIN brand. The families serve different well diameters and motor-fill arrangements; start with the measured bore and water conditions, then match the motor to the pump and electrical supply.
DOYIN · DEEP-WELL MOTOR GUIDE
01 / START WITH THE BORE
The company's series pages set minimum well diameters. These figures identify a starting family; the pump outside diameter, cable, flow clearance and installation tolerances still need a drawing-level check.
The 4YS product page specifies a well of at least 4 inches, an oil-filled rewindable motor and both single-phase 220–240 V and three-phase 380–415 V, 50 Hz options. A compact bore does not establish the shaft load or pump fit of a particular motor.
Confirm before ordering Provide the measured bore, pump end, cable clearance and required phase; request the exact motor and pump-end drawing.
View 4YS oil-filled submersible motor →5YS is the company's oil-filled 5-inch family for a well of at least 5 inches. The official page lists both single- and three-phase 50 Hz supply options and an IP68 enclosure statement for the series.
Confirm before ordering Confirm the actual casing inner diameter, duty point and material/seal version before treating it as a 4YS substitute.
View 5YS oil-filled submersible motor →Both are published for wells of at least 6 inches, but they are separate catalogue families. 6YC lists direct and star-delta starting arrangements; its material list and seal description should be checked against the precise offered build.
Confirm before ordering Ask why the supplier selects 6YS or 6YC for your pump, and obtain the nameplate, start method and cable schedule.
View 6YC oil-filled submersible motor →6HC is the water-filled family. Its published page specifies three-phase 380–415 V, 50 Hz, a 6-inch minimum well, IP68 and a maximum fluid temperature of 35°C. It is not simply an oil-filled series with a new label.
Confirm before ordering Verify the fill system, installation and maintenance instructions, thrust loading and water conditions for the quoted configuration.
View 6HC water-filled submersible motor →02 / MOTOR + PUMP
A nominal well-size label is only the first filter. Compare the minimum measured casing diameter with the assembled pump and motor outside diameter, cable guard and joint, then allow for bore straightness and installation clearance.
Ask for the pump curve at the intended duty point, number of stages, axial thrust and motor coupling dimensions. Select the motor and pump end as a system rather than matching nominal power alone.
The official pages distinguish single- and three-phase variants, and the 6-inch pages mention direct or star-delta starting. Confirm line voltage under starting load, cable length, control box and protection before choosing a motor code.
03 / SEND A USEFUL BRIEF
A requested motor series is useful, but the duty point and well conditions determine whether the offered assembly is practical.
Measured bore diameter, static and pumping water levels, installation depth, water temperature, sediment/corrosion conditions and expected run time.
Required flow and total dynamic head, pump-end model or curve, number of stages, coupling and thrust data, and whether a complete pump or a replacement motor is required.
Supply phase, voltage and frequency, control/start method, cable run, quantity, destination and needed drawings, material list, test data and maintenance instructions.
04 / COMPANY CONTEXT
DOYIN's own catalogue separates bare submersible motors from complete pumps. The national standards information platform separately names the legal company among the drafting organizations for a deep-well pump revision; that does not certify any offered motor.
The company's English site names Zhejiang Doyin Technology Co., Ltd. in Wenling. The national standards information platform independently names the same legal company among the drafting organizations for the ongoing deep-well pump standard revision.
Official product navigation lists submersible motors within the deep-well pump range. For procurement, identify whether the offer covers a bare motor, pump end or assembled pump; the documents and acceptance tests differ.
The company site refers to a predecessor that was listed on the Shenzhen exchange. That is historical context, not a claim that this present legal entity or its motor products have a current listing or third-party certification.
Keep your sourcing team on the same page.
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