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Baker Submersible Motors
Availability
Type
Voltage
Price
$0
$30,714.58
A.Y. McDonald 10" Submersible Motor - Three Wire Three Phase 460V, 125-250 HP
A.Y. McDonald
A.Y. McDonald 10" Submersible Motor - Three Wire Three Phase 460V, 125-250 HP
- Price
- From $20,949.95
A.Y. McDonald 8" Submersible Motor - Three Wire Three Phase 460V (Stainless Steel Ends), 40-150 HP
A.Y. McDonald
A.Y. McDonald 8" Submersible Motor - Three Wire Three Phase 460V (Stainless Steel Ends), 40-150 HP
- Price
- From $6,493.60
A.Y. McDonald 8" Submersible Motor - Three Wire Three Phase 460V (Cast Iron Ends), 40-150 HP
A.Y. McDonald
A.Y. McDonald 8" Submersible Motor - Three Wire Three Phase 460V (Cast Iron Ends), 40-150 HP
- Price
- From $6,493.60
A.Y. McDonald 7" Submersible Motor - Three Wire Three Phase 460V (Stainless Steel Ends), 30-75 HP
A.Y. McDonald
A.Y. McDonald 7" Submersible Motor - Three Wire Three Phase 460V (Stainless Steel Ends), 30-75 HP
- Price
- From $6,419.95
A.Y. McDonald 7" Submersible Motor - Three Wire Three Phase 460V (Cast Iron Ends), 30-75 HP
A.Y. McDonald
A.Y. McDonald 7" Submersible Motor - Three Wire Three Phase 460V (Cast Iron Ends), 30-75 HP
- Price
- From $6,419.95
A.Y. McDonald 6" Submersible Motor - Three Wire Three Phase 60 Hz, 5-60 HP
A.Y. McDonald
A.Y. McDonald 6" Submersible Motor - Three Wire Three Phase 60 Hz, 5-60 HP
- Price
- From $2,215.35
A.Y. McDonald 6" Submersible Motor - Three Wire Single Phase 230V 60 Hz, 7.5-15 HP
A.Y. McDonald
A.Y. McDonald 6" Submersible Motor - Three Wire Single Phase 230V 60 Hz, 7.5-15 HP
- Price
- From $2,916.98
A.Y. McDonald 4" Submersible Motor - 60 HZ, 1/2-10 HP
A.Y. McDonald
A.Y. McDonald 4" Submersible Motor - 60 HZ, 1/2-10 HP
- Price
- From $671.26
Baker Submersible Motors
Description
Authorized Baker Water Systems Dealer · Houston, TX
Baker
Submersible
Motors
The power half of every submersible system — sealed, water-cooled, and stainless where it counts. Baker submersible motors run from 1/2 HP residential two-wire units to 250 HP municipal machines across 4", 6", 7", 8", and 10" frames, all built to NEMA dimensional standards for direct fit to Baker pump ends and other industry-standard hydraulics.
1/2–250 HP
Five Frame Sizes
4"–10"
Well Casing Frames
2W · 3W · 3Ph
115/230/460/575V
304 SS
Water-Contact Surfaces
Start Here
Which Motor Does Your System Need?
Three questions decide it: what horsepower does the pump end require, what electrical service is available, and what casing diameter is the well?
Standard residential well, simplest install?
2-wire single phase, 1/2 through 1 1/2 HP in 115V or 230V — the starting capacitor lives in a sealed Noryl cartridge on the motor, so there's no control box at all.
→ 4" Motor · Two Wire
More horsepower, or serviceable starting components?
3-wire single phase runs 1/2 through 10 HP with the capacitors above ground in a control box you can service without pulling the pump. VFD-ready for AutoDRIVE constant pressure.
→ 4" Motor · Three Wire 1Ph
Three-phase power at the site?
4" three-phase motors in 230V, 460V, and 575V pair with an IEC starter kit — the efficient choice wherever commercial service exists, through 10 HP in the 4" frame.
→ 4" Motor · Three Phase
6" well, single-phase service, 7 1/2–15 HP?
The 6" single-phase motor covers the awkward middle — real horsepower where only single-phase power exists — paired with the 6" Deluxe control box.
→ 6" Motor · Single Phase
Irrigation or municipal duty?
6" three-phase from 5 to 60 HP in all three voltages, then 7" (30–75 HP), 8" (40–150 HP), and 10" (125–250 HP) frames at 460V for the big-bore pump ends.
→ 6"–10" Three Phase
Corrosive groundwater on a big motor?
The 7" and 8" frames come with cast iron or stainless steel end bells — chemistry decides. A water analysis is cheaper than pulling a 150 HP motor.
→ Stainless End Option
Education
Key Terms Explained
Motor nameplates and catalogs assume the vocabulary. Here's what each term actually means so the spec sheet reads itself.
Most Important
2-Wire vs 3-Wire
Where the starting components live
- 2-WireCapacitor sealed in a Noryl cartridge on the motor
- 2-Wire controlNone needed — simplest install
- 3-WireStarting components above ground in the control box
- 3-Wire advantageServiceable without pulling the pump; VFD-ready
- HP split2-wire to 1 1/2 HP · 3-wire to 10 HP (4")
Electrical
Phase & Voltage
Match the nameplate to the service, always
- Single phase115V / 230V — standard residential service
- Three phase230V / 460V / 575V — commercial service
- 460VThe standard for 7"–10" frames
- 575VCanadian & select industrial supply
- No 3Ph on site?AutoDRIVE SD3 converts 230V 1Ph → 3Ph, to 5 HP
Construction
Sealed & Cooled
How a motor survives decades underwater
- DesignAsynchronous two-pole, squirrel-cage rotor
- Thrust bearingSelf-centering, carries the pump's axial load
- Cooling & lubeGlycol-water mix at the bearing assembly
- StatorSealed in an airtight 304L stainless can
- RatingsClass F insulation · IP68 · CSA certified
Compatibility
NEMA Fit
Why Baker motors drive other ends — and vice versa
- StandardNEMA dimensional mounting on submersible frames
- MeansCommon face, bolt pattern, shaft spline
- ResultFits Baker and other NEMA-standard pump ends
- Still matchHP to the pump end's stage requirement — exactly
- Fastest checkSend both nameplates before ordering
Residential Through Light Commercial · 1/2–10 HP
4" Submersible Motors
The 4" line is an asynchronous two-pole design: squirrel-cage rotor on a self-centering thrust bearing cooled and lubricated by a glycol-water mix, stator sealed in an airtight 304L stainless can, and 304 stainless steel on every part that touches water — including the shaft. One product page, every configuration: two-wire (1/2–1 1/2 HP, 115V/230V, no control box needed), three-wire single phase (1/2–10 HP, 115V/230V, pairs with a control box), and three-wire three phase (230V/460V/575V, pairs with a starter kit). Three-wire is also the configuration that accepts the AutoDRIVE VFD for constant-pressure systems.
Power: 1/2–10 HP
2-Wire: 1/2–1 1/2 HP · 115/230V
3-Wire 1Ph: 115/230V
3-Wire 3Ph: 230/460/575V
Mounting: NEMA standard
4" Motor — Construction & Ratings
DesignAsynchronous, two-pole
Water-contact surfaces304 stainless steel ✓
Shaft304 stainless steel ✓
Stator housingAirtight 304L SS can
Thrust bearingSelf-centering · glycol-water cooled & lubricated
2-Wire startingCapacitor in Noryl cartridge on motor — no box
InsulationClass F
SubmersionIP68 ✓
ListingCSA certified ✓
MountingNEMA standard ✓
Irrigation · Municipal · Industrial
6", 7", 8" & 10" Submersible Motors
Above the 4" frame, horsepower climbs to 250 and three-phase becomes the rule — with one single-phase exception that solves a real-world problem.
| Frame | Configuration | HP Range | Voltage | Notes |
|---|---|---|---|---|
| 6" | Three-wire single phase | 7 1/2–15 HP | 230V | Pairs with the 6" Deluxe control box — real HP on residential service |
| 6" | Three-wire three phase | 5–60 HP | 230/460/575V | Starter kit required, sized to motor amperage |
| 7" | Three phase · cast iron ends | 30–75 HP | 460V | Economy build for neutral water |
| 7" | Three phase · stainless ends | 30–75 HP | 460V | Corrosion-resistant upgrade |
| 8" | Three phase · cast iron ends | 40–150 HP | 460V | The municipal workhorse |
| 8" | Three phase · stainless ends | 40–150 HP | 460V | Aggressive water, long service life |
| 10" | Three phase | 125–250 HP | 460V | Pairs with pump ends to 1,100 GPM |
⚠ Cast Iron vs Stainless Ends — Chemistry Decides
On the 7" and 8" frames, cast iron end bells save money in neutral, non-corrosive groundwater; stainless earns its premium the moment chlorides, low pH, or aggressive chemistry appear. On a motor set hundreds of feet down, the cost delta is small insurance against a very expensive pull. Have a water analysis? Send it with the RFQ.
Every Large Motor Is a Matched-Set Quote
Frame diameter must fit the casing, HP must match the pump end's stage requirement, and the starter must be calibrated to the motor's amperage — so we quote 6"–10" motors as engineered sets with the pump end and starter kit, confirmed against Baker's curves, with submittal documentation for engineer-of-record review.
Side-by-Side Reference
Motor Frame Comparison
| Feature | 4" | 6" | 7" | 8" | 10" |
|---|---|---|---|---|---|
| HP Range | 1/2–10 | 5–60 (3Ph) · 7 1/2–15 (1Ph) | 30–75 | 40–150 | 125–250 |
| Single Phase Available | ✓ 2-wire & 3-wire | ✓ 7 1/2–15 HP | — | — | — |
| Three Phase Voltages | 230/460/575V | 230/460/575V | 460V | 460V | 460V |
| End Bell Options | Stainless | Standard | Cast iron or stainless | Cast iron or stainless | Standard |
| Required Control | None (2W) · box (3W 1Ph) · starter (3Ph) | Deluxe box (1Ph) · starter (3Ph) | Starter kit | Starter kit | Starter kit |
| Typical Duty | Residential & light commercial | Irrigation & small municipal | Commercial supply | Municipal workhorse | High-volume municipal |
Don't Order the Motor Alone
Every Motor Has a Required Control
Motor → Control, In One Pass
2W
Two-Wire Single Phase → Nothing
Starting components are sealed in the motor. Pressure switch and tank complete the system.
3W1
Three-Wire Single Phase → Control Box
Standard CS to 1 HP, Standard CSCR or Deluxe for 1 1/2–5 HP, 6" Deluxe for 7 1/2–15 HP — matched to motor HP exactly.
3Ph
Three Phase → IEC Starter Kit
Contactor + overload calibrated to the motor's amperage, coil voltage matched to your service: 230V, 460V, or 575V.
VFD
Constant Pressure → AutoDRIVE
Replaces the box or starter and the pressure switch on three-wire motors through 5 HP — including three-phase output from single-phase input.
The Mismatch That Kills Motors
Controls are calibrated to motor amperage, not loosely to horsepower. A control box with the wrong capacitor values or a starter with an oversized overload protects nothing — and the failure shows up as a dead motor months later, not an error at startup. Match nameplate to nameplate, or send us both and we confirm before shipping.
Find the Other Halves
Pump ends, control boxes and repair components, and starter kits with the AutoDRIVE each have their own collection — or send your duty point and electrical service and we'll quote the complete matched set in one pass.
Technical FAQ
Common Questions
Two-wire or three-wire — which should I buy?
Through 1 1/2 HP you have the choice. Two-wire is the simplest installation — nothing above ground but the pressure switch — with the trade that a failed starting capacitor means pulling the motor. Three-wire puts the capacitors in a serviceable control box and is the configuration that accepts an AutoDRIVE VFD later. Above 1 1/2 HP the decision is made: three-wire only. Deep, expensive-to-pull sets favor three-wire every time.
How do I know what HP motor to order?
The pump end decides. Its stage count sets a specific horsepower requirement listed by model — the motor nameplate must equal it. Undersizing overloads the motor; oversizing wastes money without moving more water. If you're replacing a motor under an existing end, match the failed motor's nameplate HP and configuration exactly.
Will a Baker motor drive my existing non-Baker pump end?
In most cases yes — Baker motors are built to NEMA dimensional standards, the industry-common mounting face and spline for submersible equipment, so they mate with other NEMA-standard pump ends. Confirm the HP requirement and spline fit for your specific end model; send us both model numbers and we verify before it ships.
How does a sealed motor stay cool hundreds of feet underwater?
Two mechanisms. Internally, a glycol-water mix cools and lubricates the thrust bearing assembly that carries the pump's axial load. Externally, well water flowing past the motor shell on its way to the pump intake carries heat away — which is why motors must be set so water actually flows across them, and why running dry destroys a submersible faster than any other abuse.
I need 10 HP but only have single-phase power. What are my options?
Two paths. The 6" single-phase motor covers 7 1/2–15 HP on 230V residential-style service, paired with the 6" Deluxe control box. Below that threshold, the AutoDRIVE SD3 converts 230V single phase to three-phase output through 5 HP — letting you run a three-phase motor, with constant pressure, on ordinary house power. Above 15 HP, three-phase utility service becomes the conversation.
What do Class F, IP68, and CSA on the nameplate mean?
Class F is the insulation temperature rating of the windings — a measure of thermal headroom. IP68 is the ingress rating: sealed against dust and continuous submersion, the defining requirement of the class. CSA certification is the third-party electrical safety listing. Together they're the baseline that makes a motor a submersible motor rather than a motor that tolerates water.
When do stainless steel end bells justify their cost?
When the water analysis says so: chlorides, low pH, hydrogen sulfide, or other aggressive chemistry attacking cast iron over a multi-decade service life. On 7" and 8" motors set deep in a municipal well, the stainless premium is small against the mobilization cost of pulling a 40–150 HP string early. Neutral groundwater keeps cast iron a perfectly rational choice.
My motor won't start — is the motor actually dead?
Often not. On three-wire systems, the control box is the statistically likely culprit — a failed starting capacitor produces the classic hum-but-no-start. Work above ground first: capacitor, relay, overloads. If the box checks out, megohm the motor windings and check lead-to-lead resistance balance against spec before condemning it. We stock every control box component for exactly this diagnosis.
Send Us the Nameplates — We'll Confirm the Motor
Pump end model, available voltage and phase, and well casing size is all it takes to confirm the exact motor and its required control — same day, before anything ships.
sales@watermainsupply.com
281.664.8000Free Matching & Technical Support
sales@watermainsupply.comSame-Day Quote Response
Authorized DealerBaker Water Systems · Motors 1/2–250 HP
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