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ER20 3KW Square Air Cooled
220V/380V
5000-18000 RPM
7.8kg
Air Cooled
ER20
3KW
10A
325X118X98mm
Zhong Hua Jiang supplies the ER20 3kW square air-cooled CNC spindle motor for CNC router manufacturers, machine builders, spindle distributors, repair services and professional machining workshops. This is a spindle motor listing, not a spindle-and-VFD package. Select a compatible variable-frequency drive and confirm the required electrical configuration separately.
Request Pricing for a 3kW Square Spindle Motor
CNC Router Machine Catalogue 2025.pdf
The ER20 3kW square air-cooled spindle motor is designed for CNC router construction, industrial engraving, woodworking machinery and replacement spindle projects. Its square housing provides mounting surfaces for compatible machine structures, while the ER20 collet system accommodates a range of appropriately sized cutting tools.
Available specifications for this model include 220V or 380V configurations, 3kW rated power, 10A listed current, ER20 tooling and an operating speed range of 5,000–18,000 RPM. Motor voltage, operating frequency and VFD parameters must be matched to the actual selected variant.
Air cooling removes the need for a water pump, coolant tank or water-circulation tubing. The motor can be considered for woodworking, acrylic cutting, MDF and PVC machining, plastic processing and light non-ferrous metal engraving when the CNC machine, tools and cutting parameters are suitable.
Discuss Your CNC Router Requirements
For machine builders: confirm the square-body mounting pattern, ER20 tooling, supply voltage, external drive specifications and required machining duty before finalizing your machine design.
| Specification | Details |
|---|---|
| Model | ER20 3kW Square Air-Cooled CNC Spindle Motor |
| Rated motor power | 3kW |
| Body type | Square housing; air-cooled |
| Voltage options | 220V / 380V (select and confirm a specific variant) |
| Motor current | 10A listed in the published specifications; verify the supplied nameplate |
| Operating speed | 5,000–18,000 RPM in the published specifications; confirm final maximum speed |
| Operating frequency | 300Hz referenced by the single-motor configuration; confirm against the nameplate |
| Tool holding | ER20 collet system |
| Overall motor dimensions | 325 × 118 × 98mm |
| Motor weight | Approximately 7.8kg |
| VFD requirement | Compatible external VFD, matched to the actual electrical rating; not included by default |
| Typical equipment | CNC routers, engraving machines and suitable machine-building projects |
| Quantity | Motor-Only Supply / Ordering Notes |
|---|---|
| 1 × | ER20 3kW square air-cooled CNC spindle motor |
| 1 × | Pre-soldered aviation cable (as shown in the manufacturer's single-motor configuration) |
| 2 × | Wrenches (listed with the single-motor configuration) |
| VFD | Not included in the motor-only listing. A compatible external VFD must be selected separately. |
| Other accessories | ER20 collets, drill bits, VFD and other kit items are quoted separately unless listed on the confirmed order. |
Model identification: This is the 3kW square-motor product, not the Ø100mm round-spindle kit. The specified range is 5,000–18,000 RPM; do not exceed the nameplate limit.
Request the 3kW Square Spindle Datasheet
Use suitable router bits and feeds for wooden signs, furniture panels, MDF, plywood and carving applications.
ER20 tooling and an appropriate VFD setup can be matched to plastic engraving, acrylic signage and panel machining.
For aluminium and brass, use appropriate workholding, chip removal, tool selection and conservative cutting parameters.
Discuss Your CNC Router Application
This 3kW square spindle motor combines an ER20 tool interface, air-cooling structure, square mounting body and external VFD speed control. It is intended for OEM CNC equipment, replacement purchases and professional workshops seeking a standalone motor rather than a preassembled spindle-and-inverter kit.
For the specified square motor, the published product attributes list 325 × 118 × 98mm overall dimensions and approximately 7.8kg weight. These are motor dimensions and motor weight, not shipping-carton measurements. Confirm the fixing-hole drawing and clearance around the air vents before manufacturing a mounting bracket.
Request a 3kW Spindle Datasheet and Drawing
A matching VFD is required for spindle operation. For a 300Hz configuration, the VFD settings must be verified against the supplied motor nameplate. Do not operate the spindle above its confirmed rated frequency or maximum permitted speed.
The spindle operates through a properly matched external VFD. Speed commands, acceleration and deceleration times, current protection, and direction control depend on the chosen drive and the machine control system. Follow the spindle and VFD manuals during commissioning.
The ER20 collet interface helps users select compatible shank sizes for engraving, routing and machining. Select the correct ER20 collet for the tool shank and observe the spindle manufacturer’s permitted tooling and operating conditions.
The motor can be integrated into CNC router control systems through a compatible VFD. Before installation, verify inverter input supply, rated motor voltage, rated current, frequency, rotation direction, motor cable and control interface compatibility.
The listed motor variants are 220V/380V with 10A specified in the published specifications. Electrical ratings may vary with configuration, so the label on the actual supplied motor and the matching VFD manual govern final commissioning.
The published operating speed range for this model is 5,000–18,000 RPM. Confirm the exact rated frequency and maximum permitted speed of the ordered motor before programming the inverter.
The air-cooled square housing supports heat removal without water-circulation equipment. The product specifications state 325 × 118 × 98mm and 7.8kg. Allow suitable installation space for the motor body, electrical connector, cutting tool and cooling airflow.
Dynamic balancing is used in spindle design to control vibration at operating speed. Effective machining stability also depends on tool balance, tool overhang, machine rigidity and correctly installed bearings.
The manufacturer describes a four-bearing ceramic configuration for this model. Bearing life varies with operating speed, cutting load, contamination, lubrication design and service conditions; no fixed service-life guarantee is implied by the product description.
| Our Spindle Motor | Other Spindle Motor |
 |  |
| Runout less than 0.005mm | Runout 0.05mm |
The comparison table illustrates a spindle runout test against another motor. Runout is affected by the measurement position, collet, tool holder, test instrument and operating conditions. Confirm the inspection method and acceptance specification for your purchase order.
Precision should be assessed using a defined measurement method and agreed acceptance standard rather than comparing different spindle models without identical test conditions.
Runout inspection: comparative illustrations do not establish a universal acceptance tolerance. Request measured results or a specified inspection method when concentricity is critical.
The square housing is intended for mounting on suitable CNC machine structures. Review the mounting-hole pattern, spindle envelope and cable connection before installation. Select mounting fasteners and tightening practices based on the actual machine design.
A separate, correctly configured VFD is required. Confirm motor ratings, cable wiring and inverter parameters before running the spindle.
For OEM machine builders and distributors, Zhong Hua Jiang can discuss the required voltage, ER20 tooling, mounting interface, accessories and order quantities. Include the target machine model and selected VFD when requesting a quotation so electrical and mechanical compatibility can be checked.
Request Motor-Only Wholesale Pricing
Request Motor-Only Wholesale Pricing
The following linked products are separate air-cooled spindle-and-VFD kits in round and square formats. They are shown as alternatives for buyers who prefer bundled equipment. The ER20 3kW square spindle on this page is the motor-only selection.
Compare Motor-Only and VFD Kit Options
Compare Motor-Only and VFD Kit Options
For equipment manufacturers and wholesale buyers, the purchasing team can discuss motor configurations, replacement requirements and technical documentation for international procurement.
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Quality AssuranceSuperior quality performance Strict quality control | Patents and CertificationsSeveral patents for air-cooled spindle motors | Additional Brand ValueBrand value highly recognized by the market |
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Reasonable PriceDirect factory sales High cost performance | Full Time ServiceProfessional technical support Quick customer service | Fast and Reliable DeliveryFast and efficient delivery Real-time tracking and updates |
Zhong Hua Jiang CNC router machines include 3018, 3020, 3040 and 6090 series for engraving, routing and small-batch manufacturing applications.
The product portfolio includes round and square air-cooled spindle motors, water-cooled spindle motors and selected bundled VFD kits for different machine structures and operating requirements.
CNC components include collets, mounting hardware, Z probes, limit switches and emergency-stop devices used in machine building, servicing and upgrades.
Double-shielded cables and shielded chain cables help reduce signal interference and improve connection reliability in CNC systems.
Shielded cables and related electrical wiring products are available for CNC equipment assemblies. Cable selection should follow applicable electrical ratings and the requirements of the selected VFD and controller.
Stepper motors and CNC motion-control components are available for equipment manufacturers, machine maintenance teams and retrofit projects.
Contact Zhong Hua Jiang for OEM Supply
Documents shown in the certification image relate to the manufacturer’s product portfolio. Ask for documentation applicable to the exact spindle model and destination market.
The feedback image reflects customer communications; suitability for a particular CNC machine should be checked against its technical requirements.
A VFD is not included with the spindle motor-only configuration unless expressly stated in the confirmed quotation. A matching inverter can be specified separately. Buyers seeking a bundled spindle-and-VFD package should request the relevant kit configuration.
The listed motor power is 3kW. Motor operating conditions, power supply and VFD settings should match the actual model supplied.
The product attributes show 220V and 380V options. Specify the required motor voltage in your inquiry and confirm it against the compatible VFD output and local supply.
The published motor specification lists 5,000–18,000 RPM. The supplied spindle's nameplate and confirmed technical drawing determine the permitted maximum speed.
The corresponding single-motor configuration references a 300Hz VFD. Confirm the rated frequency, motor voltage and current on the supplied spindle before programming a drive.
The published specifications list 325 × 118 × 98mm and approximately 7.8kg. Obtain a mounting drawing to verify hole centres, connector space and the dimensions required by your machine.
The square body uses a mounting arrangement different from a round clamp-style spindle. Do not order an Ø100mm circular clamp based on a related kit; confirm the mounting-hole pattern for this square model.
ER20 identifies the spindle's collet tool-holding interface. Choose the correct ER20 collet for the cutter shank and verify tool-size compatibility before operation.
Common applications include wood, MDF, acrylic, PVC, engineering plastics and light aluminium or brass work. Machining suitability depends on cutter geometry, feed, depth of cut, coolant or chip removal where required, and machine rigidity.
It may be suitable for a compatible upgrade or replacement. Compare electrical ratings, machine rigidity, mount dimensions, wiring, controller compatibility and tool clearance before placing an order.
Air-cooled spindles use airflow instead of a circulating water-cooling system. They avoid a water pump and coolant plumbing, but require unobstructed ventilation and suitable workshop temperature conditions.
The listed interface is ER20 collet tool holding. No automatic tool changer is specified for this model. Request a dedicated ATC spindle if automatic tool changing is required.
ER20 collets and drill-bit sets are available in separately specified kits. They should not be assumed to be part of a standalone motor order unless included in the confirmed quotation.
Not by default for this motor-only product page. The 3.7kW VFD is described on a separate bundled-kit listing; ask for a quotation if a motor-and-VFD package is needed.
Runout depends on the test location, collet, gauge, temperature and assembly. A comparison image is provided on this page, but project-critical tolerances should be agreed with the supplier using a defined inspection method.
Light non-ferrous metal engraving or machining may be possible with a rigid CNC machine, suitable cutters and correctly selected speed and feed. Verify the application and load with your engineering team.
Zhong Hua Jiang supplies CNC spindle products to equipment manufacturers and distributors. Submit your forecast quantity, target application, voltage, mounting requirements and destination market for a tailored quotation.
OEM branding, labeling and packaging requirements can be discussed during quotation. Availability, MOQ and any setup charges depend on the agreed project scope.
Minimum quantity depends on the selected motor configuration and commercial terms. Share your trial or forecast volume so the sales team can confirm the applicable MOQ.
Lead time depends on quantity, electrical version, customization and production schedule. Ask for a confirmed production and shipping timeline with the quotation.
The existing seller documentation refers to a 12-month warranty. Confirm the current warranty scope, exclusions and claim procedure in the purchase contract for this exact motor variant.
Provide voltage, VFD model or desired drive, mounting-hole requirements, machining materials, tool shanks, expected duty cycle, order quantity and destination country.
The manufacturer describes technical support for installation, wiring and VFD settings. Request the applicable wiring diagram and motor nameplate data before commissioning.
