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Ball Mill Gearless Permanent Magnet Direct Drive Motor – High Starting Torque & Energy Saving
The PMDD motor is a high-efficiency drive system that directly couples a permanent magnet synchronous motor (PMSM) with the load, eliminating intermediate transmission components like gearboxes or pulleys.
Classification:
Working Principle of Permanent Magnet Direct Drive Motor
Permanent Magnet Direct Drive Motor (PMDD Motor) Working Principle
The PMDD motor is a high-efficiency drive system that directly couples a permanent magnet synchronous motor (PMSM) with the load, eliminating intermediate transmission components like gearboxes or pulleys. Its core operational principles are as follows:
Magnetic Field Generation
◇ Stator
Composed of three-phase windings that generate a rotating magnetic fieldwhen powered by variable-frequency AC.
◇ Rotor
Embedded with high-performance permanent magnets (e.g., NdFeB), creating a fixed magnetic field.
No external excitation or brushes/slip rings (brushless design).
◇ Synchronous Operation
Interaction between the stator's rotating field and rotor's permanent magnetic field forces the rotor to rotate at synchronous speed(Slip=0).
Speed is precisely adjusted (0–100% rated speed) via frequency control.
◇ Direct Load Coupling
The rotor shaft connects directly to loads (e.g., fan impellers, conveyor drums), bypassing gearboxes/couplings.
| Product | Product Category | Voltage | Power Range | Product Application |
| Permanent Magnet Direct Drive Motor (5-500rpm) | Explosion-proof | 380/415V/460V | 11KW-315KW,355KW-710KW | Oil & gas extraction (drilling rigs, oil pumps, compressors) Refineries (reactor agitators, centrifugal pumps) Chemical plants (flammable liquid transfer, gas compression) Underground ventilation fans, conveyor belt drives Coal dust transport equipment, drainage pumps Alcohol extraction workshops, spray drying towers Flour/sugar powder conveying systems, edible oil pressing equipment |
| 660V | 11KW-315KW,355KW-710KW | |||
| 1140V | 11KW-315KW,355KW-1600KW | |||
| 3300V | 200KW-1600KW | |||
| 6000V | 200KW-1600KW | |||
| 10000V | 200KW-1600KW | |||
| Non-explosion proof | 380/415V/460V | 11KW-315KW,355KW-710KW | For textile/engineering vehicles/belt machine tightening/air cooling island/flotation machine/separator/mixer/grinding machine/ball mill etc | |
| 660V | 11KW-315KW,355KW-710KW | |||
| 1140V | 11KW-315KW,355KW-3000KW | |||
| 3300V | 200KW-3000KW | |||
| 6000V | 200KW-3000KW | |||
| 10000V | 200KW-3000KW |
Advantages
◇ Transmission efficiency >98% (vs. 90–95% for geared systems).
◇ Eliminates gear wear/belt slippage.
◇ Torque Control
◇ Uses FOC (Field-Oriented Control) or DTC (Direct Torque Control) to regulate torque via current phase adjustment.
Core Advantages
◇ High Efficiency: IE4/IE5 energy class, 15–30% energy savings vs. traditional drives.
◇ Maintenance-Free: No gear oil/belts.
◇ Precision Control: Speed accuracy ±0.1%, fast dynamic response.
◇ Compact Design: 30–50% smaller than "motor+gearbox" systems.
Technical Specifications
Voltage:380V/660V/1140V Other voltages customizable, up to 10kV
| Raled freguency (Hz) | Instalation size | Outline | ||||||||||||||||||
| A | B | C | D | E | F | G | H | K | AA | BB | BC | BD | GD | HA | HB | L | AB | AC | HD | |
| H450 | 670 | 560 | 280 | 110 | 150 | 28 | 100 | 450 | 42 | 150 | 840 | 80 | 140 | 16 | 35 | - | 1210 | 820 | 852 | 1340 |
| H560① | 900 | 560 | 315 | 150 | 180 | 36 | 138 | 560 | 42 | 180 | 970 | 120 | 180 | 20 | 35 | - | 1365 | 1080 | 1120 | 1575 |
| H560 | 900 | 800 | 315 | 180 | 220 | 45 | 155 | 560 | 42 | 180 | 1180 | 120 | 180 | 25 | 35 | - | 1620 | 1080 | 1120 | 1575 |
| H530 | 1000 | 800 | 335 | 210 | 240 | 50 | 193 | 630 | 54 | 200 | 1230 | 120 | 215 | 28 | 45 | - | 1720 | 1200 | 1250 | 1720 |
| H710 | 1120 | 900 | 315 | 230 | 260 | 50 | 213 | 710 | 54 | 200 | 1280 | 120 | 190 | 28 | 45 | - | 1750 | 1320 | 1140 | 1900 |
| HBDD | 1320 | 900 | 315 | 250 | 280 | 56 | 230 | 800 | 62 | 200 | 1280 | 120 | 190 | 32 | 45 | 880 | 2145 | 1520 | 1580 | 1595 |
| H900 | 1500 | 1000 | 315 | 270 | 300 | 63 | 250 | 900 | 62 | 20 | 1330 | 120 | 165 | 32 | 45 | 1010 | 2220 | 1700 | 1850 | 1825 |
| H1000 | 1700 | 1120 | 315 | 320 | 340 | 70 | 298 | 1000 | 62 | 220 | 1470 | 120 | 175 | 36 | 45 | 1220 | 2300 | 1900 | 2010 | 2025 |
| H1120 | 1900 | 1120 | 355 | 370 | 390 | 80 | 345 | 1120 | 62 | 220 | 1560 | 120 | 220 | 40 | 45 | 1500 | 2530 | 2120 | 2220 | 2230 |
| Rated torque (Nm) |
Rated power (KW) |
Frame | Model | Efficiency n% |
Power factor cosφ |
Rated current (A) |
Maximum torque multiplier |
Rated frequency (Hz) |
|||
| Explosion-proof series |
Non-explosion-proof series |
||||||||||
| 380V | 660V | 1140V | |||||||||
| 4711 | 37 | 450 | TBVF-37/40YC (660/1140) | JXSDZ-37-40-450-(380or660or1140) | 92% | 0.97 | 63 | 36 | 21 | 20 | 25 |
| 5730 | 45 | TBVF-45/40YC (660/1140) | JXSDZ-45-40-450-(380or660or1140) | 77 | 44 | 25 | |||||
| 7003 | 55 | TBVF-55/40YC (660/1140) | JXSDZ-55-40-450-(380or660or1140) | 93 | 54 | 31 | |||||
| 9550 | 75 | 560 | TBVF-75/40YC (660/1140) | JXSDZ-75-40-560-(380or660or1140) | 92.5% | 127 | 73 | 42 | |||
| 11460 | 90 | TBVF-90/40YC (660/1140) | JXSDZ-90-40-560-(380or660or1140) | 152 | 88 | 51 | |||||
| 14007 | 110 | TBVF-110/40YC (660/1140) | JXSDZ-110-40-560-(380or660or1140) | 186 | 107 | 62 | |||||
| 16808 | 132 | TBVF-132/40YC (660/1140) | JXSDZ-132-40-560-(380or660or1140) | 222 | 128 | 74 | |||||
| 20373 | 160 | TBVF-160/40YC (660/1140) | JXSDZ-160-40-560-(380or660or1140) | 269 | 155 | 90 | |||||
| 25467 | 200 | TBVF-200/40YC (660/1140) | JXSDZ-200-40-560-(380or660or1140) | 337 | 194 | 112 | |||||
| 28013 | 220 | TBVF-220/40YC (660/1140) | JXSDZ-220-40-560-(380or660or1140) | 373 | 215 | 124 | |||||
| 31833 | 250 | TBVF-250/40YC (660/1140) | JXSDZ-250-40-560-(380or660or1140) | 423 | 244 | 141 | |||||
| 35653 | 280 | 710 | TBVF-280/40YC (660/1140) | JXSDZ-280-40-710-(380or660or1140) | 93% | 0.96 | 476 | 274 | 159 | ||
| 40110 | 315 | TBVF-315/40YC (660/1140) | JXSDZ-315-40-710-(380or660or1140) | ---- | 309 | 179 | |||||
| 45203 | 355 | TBVF-355/40YC (660/1140) | JXSDZ-355-40-710-(380or660or1140) | ---- | 348 | 202 | |||||
| 50933 | 400 | TBVF-400/40YC (660/1140) | JXSDZ-400-40-710-(380or660or1140) | 94% | ---- | 388 | 224 | ||||
| 57300 | 450 | TBVF-450/40YC (660/1140) | JXSDZ-450-40-710-(380or660or1140) | ---- | 434 | 251 | |||||
| 63667 | 500 | TBVF-500/40YC (660/1140) | JXSDZ-500-40-710-(380or660or1140) | ---- | 485 | 281 | |||||
| 71307 | 560 | 800 | TBVF-560/60YC (66/1140) | JXSDZ-560-60-800-(380or660or1140) | 94.5% | ---- | 540 | 313 | 37.5 | ||
| 80220 | 630 | TBVF-630/60YC (660/1140) | JXSDZ-630-60-800-(380or660or1140) | ---- | 604 | 350 | |||||
| 90407 | 710 | TBVF-710/60YC (660/1140) | JXSDZ-710-60-800-(380or660or1140) | ---- | 681 | 394 | |||||
| 101867 | 800 | 900 | TBVF-800/60YC (660/1140) | JXSDZ-800-60-900-(380or660or1140) | 95% | ---- | 767 | 444 | |||
| 114600 | 900 | TBVF-900/60YC (660/1140) | JXSDZ-900-60-900-(380or660or1140) | ---- | 859 | 497 | |||||
| 127333 | 1000 | TBVF-1000/60YC (660/1140) | JXSDZ-1000-60-900-(380or660or1140) | ---- | 954 | 552 | |||||
| 142613 | 1120 | 1000 | TBVF-1120/80YC (660/1140) | JXSDZ-1120-80-1000-(380or660or1140) | 95.5% | ---- | 1069 | 619 | 50 | ||
| 159167 | 1250 | TBVF-1250/80YC (660/1140) | JXSDZ-1250-80-1000-(380or660or1140) | ---- | 1193 | 691 | |||||
| 178267 | 1400 | TBVF-1400/80YC (660/1140) | JXSDZ-1400-80-1000-(380or660or1140) | ---- | 1336 | 773 | |||||
| 203733 | 1600 | 1120 | TBVF-1600/80YC (660/1140) | JXSDZ-1600-80-1120-(380or660or1140) | 95.5% | 1527 | 885 | ||||
Jasung's Permanent Magnet Direct Drive Motors Revolutionize Ball Mill Systems
Jasung's permanent magnet direct drive (PMDD) motors have been widely adopted in ball mill systems, replacing traditional induction motor drives due to their unparalleled advantages:
1.Simplified Transmission
◇ Eliminates gearboxes, reducing mechanical complexity and potential failure points.
2.Maintenance-Free Operation
◇ No lubrication or periodic part replacements required, significantly lowering lifecycle costs.
3.Ultra-High Energy Efficiency
◇ Achieves IE5 efficiency (>96%), delivering 15-30% energy savings compared to geared systems.
4.Low Noise & Vibration
◇ Operates below 75dB, creating a safer and more environmentally friendly workplace.
5.Superior Starting Performance
◇ High starting torque (200-300% rated torque) with low inrush current, ideal for heavy-duty ball mill startups.
6.Smooth Grid Integration
◇ Soft starting capability prevents power grid disturbances and mechanical shocks to connected equipment.
7.Exceptional Load Handling
◇ Rapid torque response and 250% overload capacity handle load fluctuations and impact loads effortlessly.
Typical Applications
| Fans/Pumps: Cooling towers, centrifugal fans (direct impeller drive). Conveyors: Belt conveyors, hoists (direct drum coupling). Heavy Machinery: Coal mills, ball mills (high-torque starts). |
 |
FAQ
Q: What are the Permanent Magnet Direct Drive (PMDD) Motors vs. Induction Motors - Key Differences:
Answer:
◇ Efficiency
PMDD: >96% (IE5)
Induction: 90-95% (IE3/IE4)
◇ Control
PMDD: Precise speed (±0.1%)
Induction: Slip (2-5% speed drop)
◇ Maintenance
PMDD: No brushes/gearbox
Induction: Needs regular maintenance
◇ Starting
PMDD: High torque, low current
Induction: Needs starter
◇ Size
PMDD: 30-50% smaller
◇ Cost
PMDD: Higher initial cost
Q:Can permanent magnets demagnetize? How to prevent it?
Answer:Demagnetization risks: High temperature (>150°C), strong reverse magnetic fields, or mechanical impacts may cause demagnetization.
Preventive measures:
◇ Use high-temperature-resistant magnets (e.g., NdFeB N42SH, HcJ≥35kOe).
◇ Design motor with protective slots for magnets.
◇ Install temperature sensors for real-time monitoring.
Q: Does PMDD require a drive? Can it start directly from line power?
Answer:Drive required:
◇ PMDD needs a variable frequency drive (VFD) for speed control.
◇ Direct line power startup may cause loss of synchronization and current surges (potential motor damage).
Recommended control methods: Field-oriented control (FOC) or direct torque control (DTC).
Q:What are the protection ratings for industrial PMDDs? How to select?
Answer: Common protection ratings:
◇ IP65: Dustproof + water jet protection (suitable for general industrial environments).
◇ IP66/IP67: Dustproof + strong waterproofing (for harsh environments like chemical plants and mines).
◇ Explosion-proof: Ex d IIC T4 (for hazardous areas like oil & gas).
Q: PMDD Motor shutdown setting
Answer: Design 2 PT100 embedded temperature sensors, at least one sensor for each bearing, the motor shutdowns when stator coil temperature reach 120℃ and bearing temperature reach 85℃
Q: The technical specifications of the water cooling system
Answer: Water cooling interface: standard 1-inch K-type mining quick connector. Need to connect to Jasung water cooler.
it is not recommended to use on-site natural water as it can easily block the drum water channel. The inlet pressure of cooling water is 0.6 MPa, and the water flow rate is 3 cubic meters per minute (3 m³/min)
Keyword:
Permanent Magnet Direct Drive Motor
Stator
Rotor
Direct Load Coupling
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