Three-phase servo with holding brake — vertical-axis duty
This MH31003P06F2200 is a three-phase servo motor from the Schneider Electric MH3 series, built with an integrated holding brake for applications where the load must stay put when power is removed — think vertical-axis gantries, Z-axis stages, or any axis where a coast-down would drop the tooling. The brake delivers 9 N.m holding torque, which matches the motor's continuous stall torque of 9 N.m at 115–480 V three-phase — so the brake can hold the full rated load at standstill without slipping, provided the coupling and mechanical train are sized for it.
4000 rpm nominal, 8.45 N.m — torque-speed envelope for medium-inertia loads
Rated at 4000 rpm nominal speed with 8.45 N.m nominal torque when driven by an LXM52 drive at 115 V three-phase, this motor suits applications that need both speed and moderate torque — pick-and-place, packaging indexing, or spindle positioning where the cycle time is set by the acceleration ramp, not the top speed.
Encoder feedback and shaft configuration — absolute position without a home cycle
The single-turn SinCos Hiperface encoder gives absolute position within one revolution — the drive knows the rotor angle on power-up without a homing move, which is useful on axes where the initial position must be known before the first move (e.g., a rotary table that must not crash into a fixed stop). The shaft is smooth (no keyway) with a 19 mm diameter and 40 mm length — that means the coupling must be a clamp-on type, not a keyed bushing. The centring collar is 95 mm diameter with a 3.5 mm depth, and the flange is the international standard 100 mm pattern (9 mm mounting holes). Electrical connection is via rotatable right-angled connectors — useful when the cable exit direction needs to clear a cabinet wall or a neighbouring motor. The IP65 rating means the motor body and connectors are sealed against hose-directed water, so it can live on a machine that gets washed down, provided the mating cable connector is also IP65-rated.
Electrical parameters — sizing the drive and cable
Stator resistance is 1.08 Ω and inductance is 5.23 mH — these set the electrical time constant and influence the drive's current-loop tuning. The torque constant is 1.17 N.m/A at 120 °C copper temperature, and the back-EMF constant is 77.95 V/krpm, so at 4000 rpm the motor generates about 312 V line-to-line — the drive's DC bus must be high enough to overcome this back-EMF plus the resistive drop at full current. Maximum continuous current (Irms) is 26.71 A, with a 3-second peak of the same value — this is a motor that can deliver its peak stall torque of 27 N.m for short bursts, but the continuous duty is limited by the thermal budget. The brake pull-in power is 18 W — a small load on the 24 VDC brake supply, but the brake release time matters for vertical-axis safety circuits.
The motor ships as a single unit per package, with the brake pre-installed and the encoder wired to the rotatable connector.